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Diffstat (limited to 'libraries/vital95/vital_timing-body.vhdl')
| -rw-r--r-- | libraries/vital95/vital_timing-body.vhdl | 1275 |
1 files changed, 1275 insertions, 0 deletions
diff --git a/libraries/vital95/vital_timing-body.vhdl b/libraries/vital95/vital_timing-body.vhdl new file mode 100644 index 000000000..49998bdb5 --- /dev/null +++ b/libraries/vital95/vital_timing-body.vhdl @@ -0,0 +1,1275 @@ +------------------------------------------------------------------------------- +-- Title : Standard VITAL TIMING Package +-- : $Revision$ +-- Library : VITAL +-- : +-- Developers : IEEE DASC Timing Working Group (TWG), PAR 1076.4 +-- : +-- Purpose : This packages defines standard types, attributes, constants, +-- : functions and procedures for use in developing ASIC models. +-- : This file contains the Package Body. +-- ---------------------------------------------------------------------------- +-- +-- ---------------------------------------------------------------------------- +-- Modification History : +-- ---------------------------------------------------------------------------- +-- Version No:|Auth:| Mod.Date:| Changes Made: +-- v95.0 A | | 06/08/95 | Initial ballot draft 1995 +-- v95.1 | | 08/31/95 | #203 - Timing violations at time 0 +-- #204 - Output mapping prior to glitch detection +-- ---------------------------------------------------------------------------- + +LIBRARY STD; +USE STD.TEXTIO.ALL; + +PACKAGE BODY VITAL_Timing IS + + -- -------------------------------------------------------------------- + -- Package Local Declarations + -- -------------------------------------------------------------------- + TYPE CheckType IS ( SetupCheck, HoldCheck, RecoveryCheck, RemovalCheck, + PulseWidCheck, PeriodCheck ); + + TYPE CheckInfoType IS RECORD + Violation : BOOLEAN; + CheckKind : CheckType; + ObsTime : TIME; + ExpTime : TIME; + DetTime : TIME; + State : X01; + END RECORD; + + TYPE LogicCvtTableType IS ARRAY (std_ulogic) OF CHARACTER; + TYPE HiLoStrType IS ARRAY (std_ulogic RANGE 'X' TO '1') OF STRING(1 TO 4); + + CONSTANT LogicCvtTable : LogicCvtTableType + := ( 'U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-'); + CONSTANT HiLoStr : HiLoStrType := (" X ", " Low", "High" ); + + TYPE EdgeSymbolMatchType IS ARRAY (X01,X01,VitalEdgeSymbolType) OF BOOLEAN; + -- last value, present value, edge symbol + CONSTANT EdgeSymbolMatch : EdgeSymbolMatchType := ( + 'X'=>('X'=>( OTHERS => FALSE), + '0'=>('N'|'F'|'v'|'E'|'D'|'*' => TRUE, OTHERS => FALSE ), + '1'=>('P'|'R'|'^'|'E'|'A'|'*' => TRUE, OTHERS => FALSE ) ), + '0'=>('X'=>( 'r'|'p'|'R'|'A'|'*' => TRUE, OTHERS => FALSE ), + '0'=>( OTHERS => FALSE ), + '1'=>( '/'|'P'|'p'|'R'|'*' => TRUE, OTHERS => FALSE ) ), + '1'=>('X'=>( 'f'|'n'|'F'|'D'|'*' => TRUE, OTHERS => FALSE ), + '0'=>( '\'|'N'|'n'|'F'|'*' => TRUE, OTHERS => FALSE ), + '1'=>( OTHERS => FALSE ) ) ); + + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + -- Misc Utilities Local Utilities + --------------------------------------------------------------------------- + ----------------------------------------------------------------------- + FUNCTION Minimum ( CONSTANT t1,t2 : IN TIME ) RETURN TIME IS + BEGIN + IF ( t1 < t2 ) THEN RETURN (t1); ELSE RETURN (t2); END IF; + END Minimum; + ----------------------------------------------------------------------- + FUNCTION Maximum ( CONSTANT t1,t2 : IN TIME ) RETURN TIME IS + BEGIN + IF ( t1 > t2 ) THEN RETURN (t1); ELSE RETURN (t2); END IF; + END Maximum; + + -------------------------------------------------------------------- + -- Error Message Types and Tables + -------------------------------------------------------------------- + TYPE VitalErrorType IS ( + ErrVctLng , + ErrNoPath , + ErrNegPath , + ErrNegDel + ); + + TYPE VitalErrorSeverityType IS ARRAY (VitalErrorType) OF SEVERITY_LEVEL; + CONSTANT VitalErrorSeverity : VitalErrorSeverityType := ( + ErrVctLng => ERROR, + ErrNoPath => WARNING, + ErrNegPath => WARNING, + ErrNegDel => WARNING + ); + + CONSTANT MsgNoPath : STRING := + "No Delay Path Condition TRUE. 0-delay used. Output signal is: "; + CONSTANT MsgNegPath : STRING := + "Path Delay less than time since input. 0 delay used. Output signal is: "; + CONSTANT MsgNegDel : STRING := + "Negative delay. New output value not scheduled. Output signal is: "; + CONSTANT MsgVctLng : STRING := + "Vector (array) lengths not equal. "; + + CONSTANT MsgUnknown : STRING := + "Unknown error message."; + + FUNCTION VitalMessage ( + CONSTANT ErrorId : IN VitalErrorType + ) RETURN STRING IS + BEGIN + CASE ErrorId IS + WHEN ErrVctLng => RETURN MsgVctLng; + WHEN ErrNoPath => RETURN MsgNoPath; + WHEN ErrNegPath => RETURN MsgNegPath; + WHEN ErrNegDel => RETURN MsgNegDel; + WHEN OTHERS => RETURN MsgUnknown; + END CASE; + END; + + PROCEDURE VitalError ( + CONSTANT Routine : IN STRING; + CONSTANT ErrorId : IN VitalErrorType + ) IS + BEGIN + ASSERT FALSE + REPORT Routine & ": " & VitalMessage(ErrorId) + SEVERITY VitalErrorSeverity(ErrorId); + END; + + PROCEDURE VitalError ( + CONSTANT Routine : IN STRING; + CONSTANT ErrorId : IN VitalErrorType; + CONSTANT Info : IN STRING + ) IS + BEGIN + ASSERT FALSE + REPORT Routine & ": " & VitalMessage(ErrorId) & Info + SEVERITY VitalErrorSeverity(ErrorId); + END; + + PROCEDURE VitalError ( + CONSTANT Routine : IN STRING; + CONSTANT ErrorId : IN VitalErrorType; + CONSTANT Info : IN CHARACTER + ) IS + BEGIN + ASSERT FALSE + REPORT Routine & ": " & VitalMessage(ErrorId) & Info + SEVERITY VitalErrorSeverity(ErrorId); + END; + + --------------------------------------------------------------------------- + -- Time Delay Assignment Subprograms + --------------------------------------------------------------------------- + FUNCTION VitalExtendToFillDelay ( + CONSTANT Delay : IN VitalDelayType + ) RETURN VitalDelayType01Z IS + BEGIN + RETURN (OTHERS => Delay); + END VitalExtendToFillDelay; + + FUNCTION VitalExtendToFillDelay ( + CONSTANT Delay : IN VitalDelayType01 + ) RETURN VitalDelayType01Z IS + VARIABLE Delay01Z : VitalDelayType01Z; + BEGIN + Delay01Z(tr01) := Delay(tr01); + Delay01Z(tr0z) := Delay(tr01); + Delay01Z(trz1) := Delay(tr01); + Delay01Z(tr10) := Delay(tr10); + Delay01Z(tr1z) := Delay(tr10); + Delay01Z(trz0) := Delay(tr10); + RETURN (Delay01Z); + END VitalExtendToFillDelay; + + FUNCTION VitalExtendToFillDelay ( + CONSTANT Delay : IN VitalDelayType01Z + ) RETURN VitalDelayType01Z IS + BEGIN + RETURN Delay; + END VitalExtendToFillDelay; + + --------------------------------------------------------------------------- + FUNCTION VitalCalcDelay ( + CONSTANT NewVal : IN std_ulogic := 'X'; + CONSTANT OldVal : IN std_ulogic := 'X'; + CONSTANT Delay : IN VitalDelayType + ) RETURN TIME IS + BEGIN + RETURN delay; + END VitalCalcDelay; + + FUNCTION VitalCalcDelay ( + CONSTANT NewVal : IN std_ulogic := 'X'; + CONSTANT OldVal : IN std_ulogic := 'X'; + CONSTANT Delay : IN VitalDelayType01 + ) RETURN TIME IS + VARIABLE Result : TIME; + BEGIN + CASE Newval IS + WHEN '0' | 'L' => Result := Delay(tr10); + WHEN '1' | 'H' => Result := Delay(tr01); + WHEN 'Z' => + CASE Oldval IS + WHEN '0' | 'L' => Result := Delay(tr01); + WHEN '1' | 'H' => Result := Delay(tr10); + WHEN OTHERS => Result := MAXIMUM(Delay(tr10), Delay(tr01)); + END CASE; + WHEN OTHERS => + CASE Oldval IS + WHEN '0' | 'L' => Result := Delay(tr01); + WHEN '1' | 'H' => Result := Delay(tr10); + WHEN 'Z' => Result := MINIMUM(Delay(tr10), Delay(tr01)); + WHEN OTHERS => Result := MAXIMUM(Delay(tr10), Delay(tr01)); + END CASE; + END CASE; + RETURN Result; + END VitalCalcDelay; + + FUNCTION VitalCalcDelay ( + CONSTANT NewVal : IN std_ulogic := 'X'; + CONSTANT OldVal : IN std_ulogic := 'X'; + CONSTANT Delay : IN VitalDelayType01Z + ) RETURN TIME IS + VARIABLE Result : TIME; + BEGIN + CASE Oldval IS + WHEN '0' | 'L' => + CASE Newval IS + WHEN '0' | 'L' => Result := Delay(tr10); + WHEN '1' | 'H' => Result := Delay(tr01); + WHEN 'Z' => Result := Delay(tr0z); + WHEN OTHERS => Result := MINIMUM(Delay(tr01), Delay(tr0z)); + END CASE; + WHEN '1' | 'H' => + CASE Newval IS + WHEN '0' | 'L' => Result := Delay(tr10); + WHEN '1' | 'H' => Result := Delay(tr01); + WHEN 'Z' => Result := Delay(tr1z); + WHEN OTHERS => Result := MINIMUM(Delay(tr10), Delay(tr1z)); + END CASE; + WHEN 'Z' => + CASE Newval IS + WHEN '0' | 'L' => Result := Delay(trz0); + WHEN '1' | 'H' => Result := Delay(trz1); + WHEN 'Z' => Result := MAXIMUM (Delay(tr0z), Delay(tr1z)); + WHEN OTHERS => Result := MINIMUM (Delay(trz1), Delay(trz0)); + END CASE; + WHEN 'U' | 'X' | 'W' | '-' => + CASE Newval IS + WHEN '0' | 'L' => Result := MAXIMUM(Delay(tr10), Delay(trz0)); + WHEN '1' | 'H' => Result := MAXIMUM(Delay(tr01), Delay(trz1)); + WHEN 'Z' => Result := MAXIMUM(Delay(tr1z), Delay(tr0z)); + WHEN OTHERS => Result := MAXIMUM(Delay(tr10), Delay(tr01)); + END CASE; + END CASE; + RETURN Result; + END VitalCalcDelay; + + --------------------------------------------------------------------------- + FUNCTION VitalSelectPathDelay ( + CONSTANT NewValue : IN std_logic; + CONSTANT OldValue : IN std_logic; + CONSTANT OutSignalName : IN string; + CONSTANT Paths : IN VitalPathArrayType; + CONSTANT DefaultDelay : IN VitalDelayType + ) RETURN TIME IS + + VARIABLE TmpDelay : TIME; + VARIABLE InputAge : TIME := TIME'HIGH; + VARIABLE PropDelay : TIME := TIME'HIGH; + BEGIN + -- for each delay path + FOR i IN Paths'RANGE LOOP + -- ignore the delay path if it is not enabled + NEXT WHEN NOT Paths(i).PathCondition; + -- ignore the delay path if a more recent input event has been seen + NEXT WHEN Paths(i).InputChangeTime > InputAge; + + -- This is the most recent input change (so far) + -- Get the transition dependent delay + TmpDelay := VitalCalcDelay(NewValue, OldValue, Paths(i).PathDelay); + + -- If other inputs changed at the same time, + -- then use the minimum of their propagation delays, + -- else use the propagation delay from this input. + IF Paths(i).InputChangeTime < InputAge THEN + PropDelay := TmpDelay; + ELSE -- Simultaneous inputs change + IF TmpDelay < PropDelay THEN PropDelay := TmpDelay; END IF; + end if; + + InputAge := Paths(i).InputChangeTime; + END LOOP; + + -- If there were no paths (with an enabled condition), + -- use the default the delay + IF (PropDelay = TIME'HIGH ) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- If the time since the most recent input event is greater than the + -- propagation delay from that input then + -- use the default the delay + ELSIF (InputAge > PropDelay) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- Adjust the propagation delay by the time since the + -- the input event occurred (Usually 0 ns). + ELSE + PropDelay := PropDelay - InputAge; + END IF; + + RETURN PropDelay; + END; + + FUNCTION VitalSelectPathDelay ( + CONSTANT NewValue : IN std_logic; + CONSTANT OldValue : IN std_logic; + CONSTANT OutSignalName : IN string; + CONSTANT Paths : IN VitalPathArray01Type; + CONSTANT DefaultDelay : IN VitalDelayType01 + ) RETURN TIME IS + + VARIABLE TmpDelay : TIME; + VARIABLE InputAge : TIME := TIME'HIGH; + VARIABLE PropDelay : TIME := TIME'HIGH; + BEGIN + -- for each delay path + FOR i IN Paths'RANGE LOOP + -- ignore the delay path if it is not enabled + NEXT WHEN NOT Paths(i).PathCondition; + -- ignore the delay path if a more recent input event has been seen + NEXT WHEN Paths(i).InputChangeTime > InputAge; + + -- This is the most recent input change (so far) + -- Get the transition dependent delay + TmpDelay := VitalCalcDelay(NewValue, OldValue, Paths(i).PathDelay); + + -- If other inputs changed at the same time, + -- then use the minimum of their propagation delays, + -- else use the propagation delay from this input. + IF Paths(i).InputChangeTime < InputAge THEN + PropDelay := TmpDelay; + ELSE -- Simultaneous inputs change + IF TmpDelay < PropDelay THEN PropDelay := TmpDelay; END IF; + end if; + + InputAge := Paths(i).InputChangeTime; + END LOOP; + + -- If there were no paths (with an enabled condition), + -- use the default the delay + IF (PropDelay = TIME'HIGH ) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- If the time since the most recent input event is greater than the + -- propagation delay from that input then + -- use the default the delay + ELSIF (InputAge > PropDelay) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- Adjust the propagation delay by the time since the + -- the input event occurred (Usually 0 ns). + ELSE + PropDelay := PropDelay - InputAge; + END IF; + + RETURN PropDelay; + END; + + FUNCTION VitalSelectPathDelay ( + CONSTANT NewValue : IN std_logic; + CONSTANT OldValue : IN std_logic; + CONSTANT OutSignalName : IN string; + CONSTANT Paths : IN VitalPathArray01ZType; + CONSTANT DefaultDelay : IN VitalDelayType01Z + ) RETURN TIME IS + + VARIABLE TmpDelay : TIME; + VARIABLE InputAge : TIME := TIME'HIGH; + VARIABLE PropDelay : TIME := TIME'HIGH; + BEGIN + -- for each delay path + FOR i IN Paths'RANGE LOOP + -- ignore the delay path if it is not enabled + NEXT WHEN NOT Paths(i).PathCondition; + -- ignore the delay path if a more recent input event has been seen + NEXT WHEN Paths(i).InputChangeTime > InputAge; + + -- This is the most recent input change (so far) + -- Get the transition dependent delay + TmpDelay := VitalCalcDelay(NewValue, OldValue, Paths(i).PathDelay); + + -- If other inputs changed at the same time, + -- then use the minimum of their propagation delays, + -- else use the propagation delay from this input. + IF Paths(i).InputChangeTime < InputAge THEN + PropDelay := TmpDelay; + ELSE -- Simultaneous inputs change + IF TmpDelay < PropDelay THEN PropDelay := TmpDelay; END IF; + end if; + + InputAge := Paths(i).InputChangeTime; + END LOOP; + + -- If there were no paths (with an enabled condition), + -- use the default the delay + IF (PropDelay = TIME'HIGH ) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- If the time since the most recent input event is greater than the + -- propagation delay from that input then + -- use the default the delay + ELSIF (InputAge > PropDelay) THEN + PropDelay := VitalCalcDelay(NewValue, OldValue, DefaultDelay); + + -- Adjust the propagation delay by the time since the + -- the input event occurred (Usually 0 ns). + ELSE + PropDelay := PropDelay - InputAge; + END IF; + + RETURN PropDelay; + END; + + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + -- Glitch Handlers + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + PROCEDURE ReportGlitch ( + CONSTANT GlitchRoutine : IN STRING; + CONSTANT OutSignalName : IN STRING; + CONSTANT PreemptedTime : IN TIME; + CONSTANT PreemptedValue : IN std_ulogic; + CONSTANT NewTime : IN TIME; + CONSTANT NewValue : IN std_ulogic; + CONSTANT Index : IN INTEGER := 0; + CONSTANT IsArraySignal : IN BOOLEAN := FALSE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE StrPtr1, StrPtr2, StrPtr3, StrPtr4, StrPtr5 : LINE; + BEGIN + + Write (StrPtr1, PreemptedTime ); + Write (StrPtr2, NewTime); + Write (StrPtr3, LogicCvtTable(PreemptedValue)); + Write (StrPtr4, LogicCvtTable(NewValue)); + IF IsArraySignal THEN + Write (StrPtr5, STRING'( "(" ) ); + Write (StrPtr5, Index); + Write (StrPtr5, STRING'( ")" ) ); + ELSE + Write (StrPtr5, STRING'( " " ) ); + END IF; + + -- Issue Report only if Preempted value has not been + -- removed from event queue + ASSERT PreemptedTime > NewTime + REPORT GlitchRoutine & ": GLITCH Detected on port " & + OutSignalName & StrPtr5.ALL & + "; Preempted Future Value := " & StrPtr3.ALL & + " @ " & StrPtr1.ALL & + "; Newly Scheduled Value := " & StrPtr4.ALL & + " @ " & StrPtr2.ALL & + ";" + SEVERITY MsgSeverity; + + DEALLOCATE(StrPtr1); + DEALLOCATE(StrPtr2); + DEALLOCATE(StrPtr3); + DEALLOCATE(StrPtr4); + DEALLOCATE(StrPtr5); + RETURN; + END ReportGlitch; + + --------------------------------------------------------------------------- + PROCEDURE VitalGlitch ( + SIGNAL OutSignal : OUT std_logic; + VARIABLE GlitchData : INOUT VitalGlitchDataType; + CONSTANT OutSignalName : IN string; + CONSTANT NewValue : IN std_logic; + CONSTANT NewDelay : IN TIME := 0 ns; + CONSTANT Mode : IN VitalGlitchKindType := OnEvent; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := FALSE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + --------------------------------------------------------------------------- + VARIABLE NewGlitch : BOOLEAN := TRUE; + VARIABLE dly : TIME := NewDelay; + + BEGIN + -- If nothing to schedule, just return + IF NewDelay < 0 ns THEN + IF (NewValue /= GlitchData.SchedValue) THEN + VitalError ( "VitalGlitch", ErrNegDel, OutSignalName ); + END IF; + RETURN; + END IF; + + -- If simple signal assignment + -- perform the signal assignment + IF ( Mode = VitalInertial) THEN + OutSignal <= NewValue AFTER dly; + ELSIF ( Mode = VitalTransport ) THEN + OutSignal <= TRANSPORT NewValue AFTER dly; + ELSE + -- Glitch Processing --- + -- If nothing currently scheduled + IF GlitchData.SchedTime <= NOW THEN + -- Note: NewValue is always /= OldValue when called from VPPD + IF (NewValue = GlitchData.SchedValue) THEN RETURN; END IF; + -- No new glitch, save time for possable future glitch + NewGlitch := FALSE; + GlitchData.GlitchTime := NOW+dly; + + -- New value earlier than the earliest previous value scheduled + ELSIF (NOW+dly <= GlitchData.GlitchTime) + AND (NOW+dly <= GlitchData.SchedTime) THEN + -- No new glitch, save time for possible future glitch + NewGlitch := FALSE; + GlitchData.GlitchTime := NOW+dly; + + -- Transaction currently scheduled - if glitch already happened + ELSIF GlitchData.GlitchTime <= NOW THEN + IF (GlitchData.SchedValue = NewValue) THEN + dly := Minimum( GlitchData.SchedTime-NOW, NewDelay ); + END IF; + NewGlitch := FALSE; + + -- Transaction currently scheduled (no glitch if same value) + ELSIF (GlitchData.SchedValue = NewValue) + AND (GlitchData.SchedTime = GlitchData.GlitchTime) THEN + -- revise scheduled output time if new delay is sooner + dly := Minimum( GlitchData.SchedTime-NOW, NewDelay ); + -- No new glitch, save time for possable future glitch + NewGlitch := FALSE; + GlitchData.GlitchTime := NOW+dly; + + -- Transaction currently scheduled represents a glitch + ELSE + -- A new glitch has been detected + NewGlitch := TRUE; + END IF; + + IF NewGlitch THEN + -- If messages requested, report the glitch + IF MsgOn THEN + ReportGlitch ("VitalGlitch", OutSignalName, + GlitchData.GlitchTime, GlitchData.SchedValue, + (dly + NOW), NewValue, + MsgSeverity=>MsgSeverity ); + END IF; + + -- Force immediate glitch for "OnDetect" mode. + IF (Mode = OnDetect) THEN + GlitchData.GlitchTime := NOW; + END IF; + + -- If 'X' generation is requested, schedule the new value + -- preceeded by a glitch pulse. + -- Otherwise just schedule the new value (inertial mode). + IF XOn THEN + OutSignal <= 'X' AFTER GlitchData.GlitchTime-NOW; + OutSignal <= TRANSPORT NewValue AFTER dly; + ELSE + OutSignal <= NewValue AFTER dly; + END IF; + + -- If there no new glitch was detected, just schedule the new value. + ELSE + OutSignal <= NewValue AFTER dly; + END IF; + + END IF; + + -- Record the new value and time just scheduled. + GlitchData.SchedValue := NewValue; + GlitchData.SchedTime := NOW+dly; + RETURN; + END; + + --------------------------------------------------------------------------- + PROCEDURE VitalPathDelay ( + SIGNAL OutSignal : OUT std_logic; + VARIABLE GlitchData : INOUT VitalGlitchDataType; + CONSTANT OutSignalName : IN string; + CONSTANT OutTemp : IN std_logic; + CONSTANT Paths : IN VitalPathArrayType; + CONSTANT DefaultDelay : IN VitalDelayType := VitalZeroDelay; + CONSTANT Mode : IN VitalGlitchKindType := OnEvent; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE PropDelay : TIME; + BEGIN + -- Check if the new value to be scheduled is different than the + -- previously scheduled value + IF (GlitchData.SchedTime <= NOW) AND + (GlitchData.SchedValue = OutTemp) + THEN RETURN; + END IF; + + -- Evaluate propagation delay paths + PropDelay := VitalSelectPathDelay (OutTemp, GlitchData.LastValue, + OutSignalName, Paths, DefaultDelay); + GlitchData.LastValue := OutTemp; + + -- Schedule the output transactions - including glitch handling + VitalGlitch (OutSignal, GlitchData, OutSignalName, OutTemp, + PropDelay, Mode, XOn, MsgOn, MsgSeverity ); + + END VitalPathDelay; + + PROCEDURE VitalPathDelay01 ( + SIGNAL OutSignal : OUT std_logic; + VARIABLE GlitchData : INOUT VitalGlitchDataType; + CONSTANT OutSignalName : IN string; + CONSTANT OutTemp : IN std_logic; + CONSTANT Paths : IN VitalPathArray01Type; + CONSTANT DefaultDelay : IN VitalDelayType01 := VitalZeroDelay01; + CONSTANT Mode : IN VitalGlitchKindType := OnEvent; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE PropDelay : TIME; + BEGIN + -- Check if the new value to be scheduled is different than the + -- previously scheduled value + IF (GlitchData.SchedTime <= NOW) AND + (GlitchData.SchedValue = OutTemp) + THEN RETURN; + END IF; + + -- Evaluate propagation delay paths + PropDelay := VitalSelectPathDelay (OutTemp, GlitchData.LastValue, + OutSignalName, Paths, DefaultDelay); + GlitchData.LastValue := OutTemp; + + -- Schedule the output transactions - including glitch handling + VitalGlitch (OutSignal, GlitchData, OutSignalName, OutTemp, + PropDelay, Mode, XOn, MsgOn, MsgSeverity ); + + END VitalPathDelay01; + + PROCEDURE VitalPathDelay01Z ( + SIGNAL OutSignal : OUT std_logic; + VARIABLE GlitchData : INOUT VitalGlitchDataType; + CONSTANT OutSignalName : IN string; + CONSTANT OutTemp : IN std_logic; + CONSTANT Paths : IN VitalPathArray01ZType; + CONSTANT DefaultDelay : IN VitalDelayType01Z := VitalZeroDelay01Z; + CONSTANT Mode : IN VitalGlitchKindType := OnEvent; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING; + CONSTANT OutputMap : IN VitalOutputMapType + := VitalDefaultOutputMap + ) IS + + VARIABLE PropDelay : TIME; + BEGIN + -- Check if the new value to be scheduled is different than the + -- previously scheduled value + IF (GlitchData.SchedTime <= NOW) AND + (GlitchData.SchedValue = OutputMap(OutTemp) ) + THEN RETURN; + END IF; + + -- Evaluate propagation delay paths + PropDelay := VitalSelectPathDelay (OutTemp, GlitchData.LastValue, + OutSignalName, Paths, DefaultDelay); + GlitchData.LastValue := OutTemp; + + -- Schedule the output transactions - including glitch handling + VitalGlitch (OutSignal, GlitchData, OutSignalName, OutputMap(OutTemp), + PropDelay, Mode, XOn, MsgOn, MsgSeverity ); + + END VitalPathDelay01Z; + + ---------------------------------------------------------------------------- + PROCEDURE VitalWireDelay ( + SIGNAL OutSig : OUT std_ulogic; + SIGNAL InSig : IN std_ulogic; + CONSTANT twire : IN VitalDelayType + ) IS + BEGIN + OutSig <= TRANSPORT InSig AFTER twire; + END VitalWireDelay; + + PROCEDURE VitalWireDelay ( + SIGNAL OutSig : OUT std_ulogic; + SIGNAL InSig : IN std_ulogic; + CONSTANT twire : IN VitalDelayType01 + ) IS + VARIABLE Delay : TIME; + BEGIN + Delay := VitalCalcDelay( InSig, InSig'LAST_VALUE, twire ); + OutSig <= TRANSPORT InSig AFTER Delay; + END VitalWireDelay; + + PROCEDURE VitalWireDelay ( + SIGNAL OutSig : OUT std_ulogic; + SIGNAL InSig : IN std_ulogic; + CONSTANT twire : IN VitalDelayType01Z + ) IS + VARIABLE Delay : TIME; + BEGIN + Delay := VitalCalcDelay( InSig, InSig'LAST_VALUE, twire ); + OutSig <= TRANSPORT InSig AFTER Delay; + END VitalWireDelay; + + ---------------------------------------------------------------------------- + PROCEDURE VitalSignalDelay ( + SIGNAL OutSig : OUT std_ulogic; + SIGNAL InSig : IN std_ulogic; + CONSTANT dly : IN TIME + ) IS + BEGIN + OutSig <= TRANSPORT InSig AFTER dly; + END; + + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + -- Setup and Hold Time Check Routine + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + PROCEDURE ReportViolation ( + CONSTANT TestSignalName : IN STRING := ""; + CONSTANT RefSignalName : IN STRING := ""; + CONSTANT HeaderMsg : IN STRING := " "; + CONSTANT CheckInfo : IN CheckInfoType; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + VARIABLE Message : LINE; + BEGIN + IF NOT CheckInfo.Violation THEN RETURN; END IF; + + Write ( Message, HeaderMsg ); + Case CheckInfo.CheckKind IS + WHEN SetupCheck => Write ( Message, STRING'(" SETUP ") ); + WHEN HoldCheck => Write ( Message, STRING'(" HOLD ") ); + WHEN RecoveryCheck => Write ( Message, STRING'(" RECOVERY ") ); + WHEN RemovalCheck => Write ( Message, STRING'(" REMOVAL ") ); + WHEN PulseWidCheck => Write ( Message, STRING'(" PULSE WIDTH ")); + WHEN PeriodCheck => Write ( Message, STRING'(" PERIOD ") ); + END CASE; + Write ( Message, HiLoStr(CheckInfo.State) ); + Write ( Message, STRING'(" VIOLATION ON ") ); + Write ( Message, TestSignalName ); + IF (RefSignalName'LENGTH > 0) THEN + Write ( Message, STRING'(" WITH RESPECT TO ") ); + Write ( Message, RefSignalName ); + END IF; + Write ( Message, ';' & LF ); + Write ( Message, STRING'(" Expected := ") ); + Write ( Message, CheckInfo.ExpTime); + Write ( Message, STRING'("; Observed := ") ); + Write ( Message, CheckInfo.ObsTime); + Write ( Message, STRING'("; At : ") ); + Write ( Message, CheckInfo.DetTime); + + ASSERT FALSE REPORT Message.ALL SEVERITY MsgSeverity; + + DEALLOCATE (Message); + END ReportViolation; + + --------------------------------------------------------------------------- + -- Procedure : InternalTimingCheck + --------------------------------------------------------------------------- + PROCEDURE InternalTimingCheck ( + CONSTANT TestSignal : IN std_ulogic; + CONSTANT RefSignal : IN std_ulogic; + CONSTANT TestDelay : IN TIME := 0 ns; + CONSTANT RefDelay : IN TIME := 0 ns; + CONSTANT SetupHigh : IN TIME := 0 ns; + CONSTANT SetupLow : IN TIME := 0 ns; + CONSTANT HoldHigh : IN TIME := 0 ns; + CONSTANT HoldLow : IN TIME := 0 ns; + VARIABLE RefTime : IN TIME; + VARIABLE RefEdge : IN BOOLEAN; + VARIABLE TestTime : IN TIME; + VARIABLE TestEvent : IN BOOLEAN; + VARIABLE SetupEn : INOUT BOOLEAN; + VARIABLE HoldEn : INOUT BOOLEAN; + VARIABLE CheckInfo : INOUT CheckInfoType; + CONSTANT MsgOn : IN BOOLEAN + ) IS + VARIABLE bias, b2 : TIME; + BEGIN + -- Check SETUP constraint + IF RefEdge THEN + IF SetupEn THEN + CheckInfo.ObsTime := RefTime - TestTime; + CheckInfo.State := To_X01(TestSignal); + CASE CheckInfo.State IS + WHEN '0' => CheckInfo.ExpTime := SetupLow; + WHEN '1' => CheckInfo.ExpTime := SetupHigh; + WHEN 'X' => CheckInfo.ExpTime := Maximum(SetupHigh,SetupLow); + END CASE; + CheckInfo.Violation := CheckInfo.ObsTime < CheckInfo.ExpTime; + SetupEn := FALSE; + ELSE + CheckInfo.Violation := FALSE; + END IF; + + -- Check HOLD constraint + ELSIF TestEvent THEN + IF HoldEn THEN + CheckInfo.ObsTime := TestTime - RefTime; + CheckInfo.State := To_X01(TestSignal); + CASE CheckInfo.State IS + WHEN '0' => CheckInfo.ExpTime := HoldHigh; + WHEN '1' => CheckInfo.ExpTime := HoldLow; + WHEN 'X' => CheckInfo.ExpTime := Maximum(HoldHigh,HoldLow); + END CASE; + CheckInfo.Violation := CheckInfo.ObsTime < CheckInfo.ExpTime; + HoldEn := NOT CheckInfo.Violation; + ELSE + CheckInfo.Violation := FALSE; + END IF; + ELSE + CheckInfo.Violation := FALSE; + END IF; + + -- Adjust report values to account for internal model delays + -- Note: TestDelay, RefDelay, TestTime, RefTime and bias are non-negative + IF MsgOn AND CheckInfo.Violation THEN + bias := TestDelay - RefDelay; + IF TestTime - RefTime <= bias THEN + CheckInfo.CheckKind := SetupCheck; + b2 := TIME'HIGH - bias; + IF (CheckInfo.ObsTime <= b2) + THEN CheckInfo.ObsTime := CheckInfo.ObsTime + bias; + ELSE CheckInfo.ObsTime := Time'HIGH; + END IF; + IF (CheckInfo.ExpTime <= b2) + THEN CheckInfo.ExpTime := CheckInfo.ExpTime + bias; + ELSE CheckInfo.ExpTime := Time'HIGH; + END IF; + CheckInfo.DetTime := RefTime - RefDelay; + ELSE + CheckInfo.CheckKind := HoldCheck; + CheckInfo.ObsTime := CheckInfo.ObsTime - bias; + IF (CheckInfo.ExpTime >= 0 ns) THEN + CheckInfo.ExpTime := CheckInfo.ExpTime - bias; + END IF; + CheckInfo.DetTime := TestTime - TestDelay; + END IF; + END IF; + END InternalTimingCheck; + + --------------------------------------------------------------------------- + --------------------------------------------------------------------------- + FUNCTION VitalTimingDataInit + RETURN VitalTimingDataType IS + BEGIN + RETURN (FALSE,'X', 0 ns, FALSE, 'X', 0 ns, FALSE, NULL, NULL, NULL, NULL); + END; + + --------------------------------------------------------------------------- + -- Procedure : VitalSetupHoldCheck + --------------------------------------------------------------------------- + PROCEDURE VitalSetupHoldCheck ( + VARIABLE Violation : OUT X01; + VARIABLE TimingData : INOUT VitalTimingDataType; + SIGNAL TestSignal : IN std_ulogic; + CONSTANT TestSignalName: IN STRING := ""; + CONSTANT TestDelay : IN TIME := 0 ns; + SIGNAL RefSignal : IN std_ulogic; + CONSTANT RefSignalName : IN STRING := ""; + CONSTANT RefDelay : IN TIME := 0 ns; + CONSTANT SetupHigh : IN TIME := 0 ns; + CONSTANT SetupLow : IN TIME := 0 ns; + CONSTANT HoldHigh : IN TIME := 0 ns; + CONSTANT HoldLow : IN TIME := 0 ns; + CONSTANT CheckEnabled : IN BOOLEAN := TRUE; + CONSTANT RefTransition : IN VitalEdgeSymbolType; + CONSTANT HeaderMsg : IN STRING := " "; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE CheckInfo : CheckInfoType; + VARIABLE RefEdge, TestEvent : BOOLEAN; + VARIABLE TestDly : TIME := Maximum(0 ns, TestDelay); + VARIABLE RefDly : TIME := Maximum(0 ns, RefDelay); + VARIABLE bias : TIME; + BEGIN + + IF (TimingData.NotFirstFlag = FALSE) THEN + TimingData.TestLast := To_X01(TestSignal); + TimingData.RefLast := To_X01(RefSignal); + TimingData.NotFirstFlag := TRUE; + END IF; + + -- Detect reference edges and record the time of the last edge + RefEdge := EdgeSymbolMatch(TimingData.RefLast, To_X01(RefSignal), + RefTransition); + TimingData.RefLast := To_X01(RefSignal); + IF RefEdge THEN + TimingData.RefTime := NOW; + TimingData.HoldEn := TRUE; + END IF; + + -- Detect test (data) changes and record the time of the last change + TestEvent := TimingData.TestLast /= To_X01Z(TestSignal); + TimingData.TestLast := To_X01Z(TestSignal); + IF TestEvent THEN + TimingData.TestTime := NOW; + TimingData.SetupEn := TRUE; + END IF; + + -- Perform timing checks (if enabled) + Violation := '0'; + IF (CheckEnabled) THEN + InternalTimingCheck ( + TestSignal => TestSignal, + RefSignal => RefSignal, + TestDelay => TestDly, + RefDelay => RefDly, + SetupHigh => SetupHigh, + SetupLow => SetupLow, + HoldHigh => HoldHigh, + HoldLow => HoldLow, + RefTime => TimingData.RefTime, + RefEdge => RefEdge, + TestTime => TimingData.TestTime, + TestEvent => TestEvent, + SetupEn => TimingData.SetupEn, + HoldEn => TimingData.HoldEn, + CheckInfo => CheckInfo, + MsgOn => MsgOn ); + + -- Report any detected violations and set return violation flag + IF CheckInfo.Violation THEN + IF (MsgOn) THEN + ReportViolation (TestSignalName, RefSignalName, + HeaderMsg, CheckInfo, MsgSeverity ); + END IF; + IF (XOn) THEN Violation := 'X'; END IF; + END IF; + END IF; + + END VitalSetupHoldCheck; + + --------------------------------------------------------------------------- + PROCEDURE VitalSetupHoldCheck ( + VARIABLE Violation : OUT X01; + VARIABLE TimingData : INOUT VitalTimingDataType; + SIGNAL TestSignal : IN std_logic_vector; + CONSTANT TestSignalName: IN STRING := ""; + CONSTANT TestDelay : IN TIME := 0 ns; + SIGNAL RefSignal : IN std_ulogic; + CONSTANT RefSignalName : IN STRING := ""; + CONSTANT RefDelay : IN TIME := 0 ns; + CONSTANT SetupHigh : IN TIME := 0 ns; + CONSTANT SetupLow : IN TIME := 0 ns; + CONSTANT HoldHigh : IN TIME := 0 ns; + CONSTANT HoldLow : IN TIME := 0 ns; + CONSTANT CheckEnabled : IN BOOLEAN := TRUE; + CONSTANT RefTransition : IN VitalEdgeSymbolType; + CONSTANT HeaderMsg : IN STRING := " "; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE CheckInfo : CheckInfoType; + VARIABLE RefEdge : BOOLEAN; + VARIABLE TestEvent : VitalBoolArrayT(TestSignal'RANGE); + VARIABLE TestDly : TIME := Maximum(0 ns, TestDelay); + VARIABLE RefDly : TIME := Maximum(0 ns, RefDelay); + VARIABLE bias : TIME; + VARIABLE ChangedAllAtOnce : BOOLEAN := TRUE; + VARIABLE StrPtr1 : LINE; + + BEGIN + -- Initialization of working area. + IF (TimingData.NotFirstFlag = FALSE) THEN + TimingData.TestLastA := NEW std_logic_vector(TestSignal'RANGE); + TimingData.TestTimeA := NEW VitalTimeArrayT(TestSignal'RANGE); + TimingData.HoldEnA := NEW VitalBoolArrayT(TestSignal'RANGE); + TimingData.SetupEnA := NEW VitalBoolArrayT(TestSignal'RANGE); + FOR i IN TestSignal'RANGE LOOP + TimingData.TestLastA(i) := To_X01(TestSignal(i)); + END LOOP; + TimingData.RefLast := To_X01(RefSignal); + TimingData.NotFirstFlag := TRUE; + END IF; + + -- Detect reference edges and record the time of the last edge + RefEdge := EdgeSymbolMatch(TimingData.RefLast, To_X01(RefSignal), + RefTransition); + TimingData.RefLast := To_X01(RefSignal); + IF RefEdge THEN + TimingData.RefTime := NOW; + TimingData.HoldEnA.all := (TestSignal'RANGE=>TRUE); + END IF; + + -- Detect test (data) changes and record the time of the last change + FOR i IN TestSignal'RANGE LOOP + TestEvent(i) := TimingData.TestLastA(i) /= To_X01Z(TestSignal(i)); + TimingData.TestLastA(i) := To_X01Z(TestSignal(i)); + IF TestEvent(i) THEN + TimingData.TestTimeA(i) := NOW; + TimingData.SetupEnA(i) := TRUE; + TimingData.TestTime := NOW; + END IF; + END LOOP; + + -- Check to see if the Bus subelements changed all at the same time. + -- If so, then we can reduce the volume of error messages since we no + -- longer have to report every subelement individually + FOR i IN TestSignal'RANGE LOOP + IF TimingData.TestTimeA(i) /= TimingData.TestTime THEN + ChangedAllAtOnce := FALSE; + EXIT; + END IF; + END LOOP; + + -- Perform timing checks (if enabled) + Violation := '0'; + IF (CheckEnabled) THEN + FOR i IN TestSignal'RANGE LOOP + InternalTimingCheck ( + TestSignal => TestSignal(i), + RefSignal => RefSignal, + TestDelay => TestDly, + RefDelay => RefDly, + SetupHigh => SetupHigh, + SetupLow => SetupLow, + HoldHigh => HoldHigh, + HoldLow => HoldLow, + RefTime => TimingData.RefTime, + RefEdge => RefEdge, + TestTime => TimingData.TestTimeA(i), + TestEvent => TestEvent(i), + SetupEn => TimingData.SetupEnA(i), + HoldEn => TimingData.HoldEnA(i), + CheckInfo => CheckInfo, + MsgOn => MsgOn ); + + -- Report any detected violations and set return violation flag + IF CheckInfo.Violation THEN + IF (MsgOn) THEN + IF ( ChangedAllAtOnce AND (i = TestSignal'LEFT) ) THEN + ReportViolation (TestSignalName&"(...)", RefSignalName, + HeaderMsg, CheckInfo, MsgSeverity ); + ELSIF (NOT ChangedAllAtOnce) THEN + Write (StrPtr1, i); + ReportViolation (TestSignalName & "(" & StrPtr1.ALL & ")", + RefSignalName, + HeaderMsg, CheckInfo, MsgSeverity ); + DEALLOCATE (StrPtr1); + END IF; + END IF; + IF (XOn) THEN + Violation := 'X'; + END IF; + END IF; + END LOOP; + END IF; + + DEALLOCATE (StrPtr1); + + END VitalSetupHoldCheck; + + --------------------------------------------------------------------------- + -- Function : VitalRecoveryRemovalCheck + --------------------------------------------------------------------------- + PROCEDURE VitalRecoveryRemovalCheck ( + VARIABLE Violation : OUT X01; + VARIABLE TimingData : INOUT VitalTimingDataType; + SIGNAL TestSignal : IN std_ulogic; + CONSTANT TestSignalName: IN STRING := ""; + CONSTANT TestDelay : IN TIME := 0 ns; + SIGNAL RefSignal : IN std_ulogic; + CONSTANT RefSignalName : IN STRING := ""; + CONSTANT RefDelay : IN TIME := 0 ns; + CONSTANT Recovery : IN TIME := 0 ns; + CONSTANT Removal : IN TIME := 0 ns; + CONSTANT ActiveLow : IN BOOLEAN := TRUE; + CONSTANT CheckEnabled : IN BOOLEAN := TRUE; + CONSTANT RefTransition : IN VitalEdgeSymbolType; + CONSTANT HeaderMsg : IN STRING := " "; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + VARIABLE CheckInfo : CheckInfoType; + VARIABLE RefEdge, TestEvent : BOOLEAN; + VARIABLE TestDly : TIME := Maximum(0 ns, TestDelay); + VARIABLE RefDly : TIME := Maximum(0 ns, RefDelay); + VARIABLE bias : TIME; + BEGIN + + IF (TimingData.NotFirstFlag = FALSE) THEN + TimingData.TestLast := To_X01(TestSignal); + TimingData.RefLast := To_X01(RefSignal); + TimingData.NotFirstFlag := TRUE; + END IF; + + -- Detect reference edges and record the time of the last edge + RefEdge := EdgeSymbolMatch(TimingData.RefLast, To_X01(RefSignal), + RefTransition); + TimingData.RefLast := To_X01(RefSignal); + IF RefEdge THEN + TimingData.RefTime := NOW; + TimingData.HoldEn := TRUE; + END IF; + + -- Detect test (data) changes and record the time of the last change + TestEvent := TimingData.TestLast /= To_X01Z(TestSignal); + TimingData.TestLast := To_X01Z(TestSignal); + IF TestEvent THEN + TimingData.TestTime := NOW; + TimingData.SetupEn := TRUE; + END IF; + + -- Perform timing checks (if enabled) + Violation := '0'; + IF (CheckEnabled) THEN + + IF ActiveLow THEN + InternalTimingCheck ( + TestSignal, RefSignal, TestDly, RefDly, + Recovery, 0 ns, 0 ns, Removal, + TimingData.RefTime, RefEdge, + TimingData.TestTime, TestEvent, + TimingData.SetupEn, TimingData.HoldEn, + CheckInfo, MsgOn ); + ELSE + InternalTimingCheck ( + TestSignal, RefSignal, TestDly, RefDly, + 0 ns, Recovery, Removal, 0 ns, + TimingData.RefTime, RefEdge, + TimingData.TestTime, TestEvent, + TimingData.SetupEn, TimingData.HoldEn, + CheckInfo, MsgOn ); + END IF; + + + -- Report any detected violations and set return violation flag + IF CheckInfo.Violation THEN + IF CheckInfo.CheckKind = SetupCheck THEN + CheckInfo.CheckKind := RecoveryCheck; + ELSE + CheckInfo.CheckKind := RemovalCheck; + END IF; + IF (MsgOn) THEN + ReportViolation (TestSignalName, RefSignalName, + HeaderMsg, CheckInfo, MsgSeverity ); + END IF; + IF (XOn) THEN Violation := 'X'; END IF; + END IF; + END IF; + + END VitalRecoveryRemovalCheck; + + --------------------------------------------------------------------------- + PROCEDURE VitalPeriodPulseCheck ( + VARIABLE Violation : OUT X01; + VARIABLE PeriodData : INOUT VitalPeriodDataType; + SIGNAL TestSignal : IN std_ulogic; + CONSTANT TestSignalName : IN STRING := ""; + CONSTANT TestDelay : IN TIME := 0 ns; + CONSTANT Period : IN TIME := 0 ns; + CONSTANT PulseWidthHigh : IN TIME := 0 ns; + CONSTANT PulseWidthLow : IN TIME := 0 ns; + CONSTANT CheckEnabled : IN BOOLEAN := TRUE; + CONSTANT HeaderMsg : IN STRING := " "; + CONSTANT XOn : IN BOOLEAN := TRUE; + CONSTANT MsgOn : IN BOOLEAN := TRUE; + CONSTANT MsgSeverity : IN SEVERITY_LEVEL := WARNING + ) IS + + VARIABLE TestDly : TIME := Maximum(0 ns, TestDelay); + VARIABLE CheckInfo : CheckInfoType; + VARIABLE PeriodObs : TIME; + VARIABLE PulseTest, PeriodTest : BOOLEAN; + VARIABLE TestValue : X01 := To_X01(TestSignal); + BEGIN + + IF (PeriodData.NotFirstFlag = FALSE) THEN + PeriodData.Rise := + -maximum(Period, maximum(PulseWidthHigh, PulseWidthLow)); + PeriodData.Fall := + -maximum(Period, maximum(PulseWidthHigh, PulseWidthLow)); + PeriodData.Last := To_X01(TestSignal); + PeriodData.NotFirstFlag := TRUE; + END IF; + + -- Initialize for no violation + -- No violation possible if no test signal change + Violation := '0'; + IF (PeriodData.Last = TestValue) THEN + RETURN; + END IF; + + -- record starting pulse times + IF EdgeSymbolMatch(PeriodData.Last, TestValue, 'P') THEN + -- Compute period times, then record the High Rise Time + PeriodObs := NOW - PeriodData.Rise; + PeriodData.Rise := NOW; + PeriodTest := TRUE; + ELSIF EdgeSymbolMatch(PeriodData.Last, TestValue, 'N') THEN + -- Compute period times, then record the Low Fall Time + PeriodObs := NOW - PeriodData.Fall; + PeriodData.Fall := NOW; + PeriodTest := TRUE; + ELSE + PeriodTest := FALSE; + END IF; + + -- do checks on pulse ends + IF EdgeSymbolMatch(PeriodData.Last, TestValue, 'p') THEN + -- Compute pulse times + CheckInfo.ObsTime := NOW - PeriodData.Fall; + CheckInfo.ExpTime := PulseWidthLow; + PulseTest := TRUE; + ELSIF EdgeSymbolMatch(PeriodData.Last, TestValue, 'n') THEN + -- Compute pulse times + CheckInfo.ObsTime := NOW - PeriodData.Rise; + CheckInfo.ExpTime := PulseWidthHigh; + PulseTest := TRUE; + ELSE + PulseTest := FALSE; + END IF; + + IF PulseTest AND CheckEnabled THEN + -- Verify Pulse Width [ignore 1st edge] + IF ( CheckInfo.ObsTime < CheckInfo.ExpTime ) THEN + IF (XOn) THEN Violation := 'X'; END IF; + IF (MsgOn) THEN + CheckInfo.Violation := TRUE; + CheckInfo.CheckKind := PulseWidCheck; + CheckInfo.DetTime := NOW - TestDly; + CheckInfo.State := PeriodData.Last; + ReportViolation (TestSignalName, "", + HeaderMsg, CheckInfo, MsgSeverity ); + END IF; -- MsgOn + END IF; + END IF; + + IF PeriodTest AND CheckEnabled THEN + -- Verify the Period [ignore 1st edge] + CheckInfo.ObsTime := PeriodObs; + CheckInfo.ExpTime := Period; + IF ( CheckInfo.ObsTime < CheckInfo.ExpTime ) THEN + IF (XOn) THEN Violation := 'X'; END IF; + IF (MsgOn) THEN + CheckInfo.Violation := TRUE; + CheckInfo.CheckKind := PeriodCheck; + CheckInfo.DetTime := NOW - TestDly; + CheckInfo.State := TestValue; + ReportViolation (TestSignalName, "", + HeaderMsg, CheckInfo, MsgSeverity ); + END IF; -- MsgOn + END IF; + END IF; + + PeriodData.Last := TestValue; + + END VitalPeriodPulseCheck; + +END VITAL_Timing; + |