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--                                                 Chapter 23 - Case Study 4: Communications System
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-- Filename                                     Primary Unit                            Secondary Unit                  Figure/Section
-----------                                     ------------                            --------------                  --------------
bfsk.vhd                                        entity bfsk                             behavioral                      Figure 23-3
bfsk_wa.vhd                                     entity bfsk_wa                          behavioral                      --
MeasFreq.vhd                                    entity MeasFreq                         ThresDetect                     Figure 23-5
v_BPF.vhd                                       entity v_BPF                            behavioral                      Figure 23-8
v_Sum.vhd                                       entity v_Sum                            behavioral                      Figure 23-9
PLL.vhd                                         entity PLL                              behavioral                      Figure 23-12
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--                                                                    TestBenches
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-- Filename                                     Primary Unit                            Secondary Unit                  Tested Model
------------                                    ------------                            --------------                  ------------
tb_pll.vhd                                      entity tb_pll                           tb_pll                          PLL.vhd
tb_CS4_CommSys_PLL.vhd                          entity VCOAnalog                        behavioral
--                                              entity vLeadLag                         behavioral
--                                              entity vMult                            behavioral
--                                              entity PLL                              PLL
--                                              entity bfsk                             behavioral
--                                              entity vLPF_2nd                         behavioral
--                                              entity MeasFreq                         ThresDetect
--                                              entity a2d_bit                          ideal
--                                              entity tb_CS4_CommSys_PLL               TB_CS4_CommSys_PLL
tb_CS4_CommSys_det.vhd                          entity capacitor                        ideal
--                                              entity resistor                         ideal
--                                              entity diode                            ideal
--                                              entity EnvDetect                        EnvDetect
--                                              entity bfsk                             behavioral
--                                              entity vSum                             behavioral
--                                              entity vLPF_2nd                         behavioral
--                                              entity vBPF                             behavioral
--                                              entity MeasFreq                         ThresDetect
--                                              entity a2d_bit                          ideal
--                                              entity tb_CS4_CommSys_det               TB_CS4_CommSys_det