diff options
Diffstat (limited to 'techlibs/xilinx')
| -rw-r--r-- | techlibs/xilinx/cells_map.v | 41 | ||||
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 18 |
2 files changed, 56 insertions, 3 deletions
diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v index 2eb9fa2c1..6ebca0d54 100644 --- a/techlibs/xilinx/cells_map.v +++ b/techlibs/xilinx/cells_map.v @@ -365,3 +365,44 @@ module \$__XILINX_MUXF78 (O, I0, I1, I2, I3, S0, S1); MUXF8 mux8 (.I0(T0), .I1(T1), .S(S1), .O(O)); endmodule `endif + +module \$__MUL25X18 (input [24:0] A, input [17:0] B, output [42:0] OUT); + wire [47:0] P_48; + DSP48E1 #( + // Disable all registers + .ACASCREG(0), + .ADREG(0), + .A_INPUT("DIRECT"), + .ALUMODEREG(0), + .AREG(0), + .BCASCREG(0), + .B_INPUT("DIRECT"), + .BREG(0), + .CARRYINREG(0), + .CARRYINSELREG(0), + .CREG(0), + .DREG(0), + .INMODEREG(0), + .MREG(0), + .OPMODEREG(0), + .PREG(0) + ) _TECHMAP_REPLACE_ ( + //Data path + .A({5'b0, A}), + .B(B), + .C(48'b0), + .D(24'b0), + .P(P_48), + + .INMODE(4'b0000), + .ALUMODE(4'b0000), + .OPMODE(7'b000101), + .CARRYINSEL(3'b000), + + .ACIN(30'b0), + .BCIN(18'b0), + .PCIN(48'b0), + .CARRYIN(1'b0) + ); + assign OUT = P_48; +endmodule diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index b672a0d4f..01e75b50e 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -78,6 +78,9 @@ struct SynthXilinxPass : public ScriptPass log(" -nowidelut\n"); log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\n"); log("\n"); + log(" -nodsp\n"); + log(" do not use DSP48E1s to implement multipliers and associated logic\n"); + log("\n"); log(" -widemux <int>\n"); log(" enable inference of hard multiplexer resources (MUXF[78]) for muxes at or\n"); log(" above this number of inputs (minimum value 2, recommended value >= 5).\n"); @@ -104,7 +107,7 @@ struct SynthXilinxPass : public ScriptPass } std::string top_opt, edif_file, blif_file, family; - bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, abc9; + bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, nodsp, abc9; int widemux; void clear_flags() YS_OVERRIDE @@ -122,6 +125,7 @@ struct SynthXilinxPass : public ScriptPass nosrl = false; nocarry = false; nowidelut = false; + nodsp = false; abc9 = false; widemux = 0; } @@ -202,6 +206,10 @@ struct SynthXilinxPass : public ScriptPass abc9 = true; continue; } + if (args[argidx] == "-nodsp") { + nodsp = true; + continue; + } break; } extra_args(args, argidx, design); @@ -249,8 +257,8 @@ struct SynthXilinxPass : public ScriptPass if (check_label("coarse")) { run("proc"); - if (help_mode || flatten) - run("flatten", "(if -flatten)"); + if (flatten || help_mode) + run("flatten", "(with '-flatten')"); run("opt_expr"); run("opt_clean"); run("check"); @@ -275,6 +283,10 @@ struct SynthXilinxPass : public ScriptPass } run("techmap -map +/cmp2lut.v -D LUT_WIDTH=6"); + + if (!nodsp || help_mode) + run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=25 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL25X18"); + run("alumacc"); run("share"); run("opt"); |