-------------------------------------------------------------------------------- -- File Name: stdh374.vhd -------------------------------------------------------------------------------- -- Copyright (C) 1997 Free Model Foundry; http://www.FreeModelFoundry.com -- -- This program is free software; you can redistribute it and/or modify -- it under the terms of the GNU General Public License version 2 as -- published by the Free Software Foundation. -- -- MODIFICATION HISTORY: -- -- version | author | mod date | changes made -- V1.0 R. Munden 97 NOV 30 Conformed to style guide -------------------------------------------------------------------------------- -- PART DESCRIPTION: -- -- Library: STNDH -- Technology: 54/74XXXX -- Part: STDH374 -- -- Desciption: Positive-Edge Triggered Flip-Flop with bus hold -------------------------------------------------------------------------------- LIBRARY IEEE; USE IEEE.std_logic_1164.ALL; USE IEEE.VITAL_timing.ALL; USE IEEE.VITAL_primitives.ALL; LIBRARY FMF; USE FMF.gen_utils.ALL; USE FMF.ff_package.ALL; -------------------------------------------------------------------------------- -- ENTITY DECLARATION -------------------------------------------------------------------------------- ENTITY stdh374 IS GENERIC ( -- tipd delays: interconnect path delays tipd_D : VitalDelayType01 := VitalZeroDelay01; tipd_CLK : VitalDelayType01 := VitalZeroDelay01; tipd_OENeg : VitalDelayType01 := VitalZeroDelay01; -- tpd delays tpd_CLK_Q : VitalDelayType01 := UnitDelay01; tpd_OENeg_Q : VitalDelayType01Z := UnitDelay01Z; -- tsetup values: setup times tsetup_D_CLK : VitalDelayType := UnitDelay; -- thold values: hold times thold_D_CLK : VitalDelayType := UnitDelay; -- tpw values: pulse widths tpw_CLK_posedge : VitalDelayType := UnitDelay; tpw_CLK_negedge : VitalDelayType := UnitDelay; -- tperiod_min: minimum clock period = 1/max freq tperiod_CLK_posedge : VitalDelayType := UnitDelay; -- generic control parameters TimingChecksOn : Boolean := DefaultTimingChecks; MsgOn : BOOLEAN := DefaultMsgOn; XOn : Boolean := DefaultXOn; InstancePath : STRING := DefaultInstancePath; -- For FMF SDF techonology file usage TimingModel : STRING := DefaultTimingModel ); PORT ( Q : OUT std_logic := 'U'; D : IN std_logic := 'X'; CLK : IN std_logic := 'X'; OENeg : IN std_logic := 'X' ); ATTRIBUTE VITAL_LEVEL0 of stdh374 : ENTITY IS TRUE; END stdh374; -------------------------------------------------------------------------------- -- ARCHITECTURE DECLARATION -------------------------------------------------------------------------------- ARCHITECTURE vhdl_behavioral of stdh374 IS ATTRIBUTE VITAL_LEVEL1 of vhdl_behavioral : ARCHITECTURE IS FALSE; SIGNAL Qint : std_ulogic := 'X'; SIGNAL D_ipd : std_ulogic := 'X'; SIGNAL Dint : std_logic := 'X'; SIGNAL DintNeg : std_ulogic := 'X'; SIGNAL CLK_ipd : std_ulogic := 'X'; SIGNAL OENeg_ipd : std_ulogic := 'X'; BEGIN ---------------------------------------------------------------------------- -- Wire Delays ---------------------------------------------------------------------------- WireDelay : BLOCK BEGIN w_1: VitalWireDelay (D_ipd, D, tipd_D); w_2: VitalWireDelay (CLK_ipd, CLK, tipd_CLK); w_3: VitalWireDelay (OENeg_ipd, OENeg, tipd_OENeg); END BLOCK; ---------------------------------------------------------------------------- -- Concurrent Procedures ---------------------------------------------------------------------------- a_1: VitalBUF (q => Dint, a => D_ipd, ResultMap => ('U', 'Z', '0', '1')); a_2: VitalINV (q => DintNeg, a => Dint); a_3: VitalINV (q => Dint, a => DintNeg, ResultMap => ('Z', 'Z', '0', '1')); ---------------------------------------------------------------------------- -- Output Behavior Process ---------------------------------------------------------------------------- VitalOutput : PROCESS (Qint, OENeg_ipd, CLK_ipd) -- Functionality Results Variables VARIABLE Q_zd : std_ulogic; -- Output Glitch Detection Variables VARIABLE Q_GlitchData : VitalGlitchDataType; BEGIN ------------------------------------------------------------------------ -- Functionality Section ------------------------------------------------------------------------ Q_zd := VitalBUFIF0 (data => Qint, enable => OENeg_ipd); ------------------------------------------------------------------------ -- Path Delay Section ------------------------------------------------------------------------ VitalPathDelay01Z ( OutSignal => Q, OutSignalName => "Q", OutTemp => Q_zd, GlitchData => Q_GlitchData, Paths => ( 0 => (InputChangeTime => CLK_ipd'LAST_EVENT, PathDelay => VitalExtendToFillDelay(VitalZeroDelay01), PathCondition => TRUE), 1 => (InputChangeTime => OENeg_ipd'LAST_EVENT, PathDelay => tpd_OENeg_Q, PathCondition => TRUE)) ); END PROCESS; ---------------------------------------------------------------------------- -- Main Behavior Process ---------------------------------------------------------------------------- VitalBehavior : PROCESS (CLK_ipd, Dint) -- Timing Check Variables VARIABLE Tviol_D_CLK : X01 := '0'; VARIABLE TD_D_CLK : VitalTimingDataType; VARIABLE Pviol_CLK : X01 := '0'; VARIABLE PD_CLK : VitalPeriodDataType := VitalPeriodDataInit; VARIABLE Violation : X01 := '0'; -- Functionality Results Variables VARIABLE Q_zd : std_ulogic; VARIABLE PrevData : std_logic_vector(0 to 2); -- Output Glitch Detection Variables VARIABLE Q_GlitchData : VitalGlitchDataType; BEGIN ------------------------------------------------------------------------ -- Timing Check Section ------------------------------------------------------------------------ IF (TimingChecksOn) THEN VitalSetupHoldCheck ( TestSignal => Dint, TestSignalName => "Dint", RefSignal => CLK_ipd, RefSignalName => "CLK_ipd", SetupHigh => tsetup_D_CLK, SetupLow => tsetup_D_CLK, HoldHigh => thold_D_CLK, HoldLow => thold_D_CLK, CheckEnabled => TRUE, RefTransition => '/', HeaderMsg => InstancePath & "/stdh374", TimingData => TD_D_CLK, XOn => XOn, MsgOn => MsgOn, Violation => Tviol_D_CLK ); VitalPeriodPulseCheck ( TestSignal => CLK_ipd, TestSignalName => "CLK_ipd", Period => tperiod_CLK_posedge, PulseWidthHigh => tpw_CLK_posedge, PulseWidthLow => tpw_CLK_negedge, CheckEnabled => TRUE, HeaderMsg => InstancePath & "/stdh374", PeriodData => PD_CLK, XOn => XOn, MsgOn => MsgOn, Violation => Pviol_CLK ); END IF; ------------------------------------------------------------------------ -- Functionality Section ------------------------------------------------------------------------ Violation := Tviol_D_CLK OR Pviol_CLK; VitalStateTable ( StateTable => DFF_tab, DataIn => (Violation, CLK_ipd, Dint), Result => Q_zd, PreviousDataIn => PrevData ); ------------------------------------------------------------------------ -- Path Delay Section ------------------------------------------------------------------------ VitalPathDelay01 ( OutSignal => Qint, OutSignalName => "Qint", OutTemp => Q_zd, GlitchData => Q_GlitchData, XOn => XOn, MsgOn => MsgOn, Paths => ( 0 => (InputChangeTime => CLK_ipd'LAST_EVENT, PathDelay => tpd_CLK_Q, PathCondition => TRUE) ) ); END PROCESS; END vhdl_behavioral;