;PALASM Design Description ;************ MODIFICATIONS - 2/24/97 ************************** ;* Change ouptputs (.outf) to outputs by state bit assignment ;*************************************************************** ;---------------------------------- Declaration Segment ------------ TITLE TUTOR9.PDS PATTERN A REVISION 2.0 AUTHOR J.ENGINEER COMPANY ADVANCED MICRO DEVICES DATE 01/01/90 CHIP ANSWER PAL22V10 ;---------------------------------- PIN Declarations --------------- PIN 1 CLOCK COMBINATORIAL ; INPUT PIN 2 DIALTONE COMBINATORIAL ; INPUT PIN 3 RING COMBINATORIAL ; INPUT PIN 4 ENDGREETING COMBINATORIAL ; INPUT PIN 5 ENDMESSAGE COMBINATORIAL ; INPUT PIN 12 GND ; INPUT PIN 17 ANSWER COMB ; OUTPUT PIN 18 PLAY COMB ; OUTPUT PIN 19 RECORD COMB ; OUTPUT PIN 20 SB0 REG ; Output PIN 21 SB1 REG ; Output PIN 24 VCC ; INPUT ;-----------------------------------State Segment ------------------ STATE MEALY_MACHINE START_UP := POWER_UP -> DUMMY ; ## to force it to use my state bits START_UP.OUTF := POWER_UP -> /ANSWER * /PLAY * /RECORD ; begin transition equations DUMMY := VCC -> WAITING ;## WAITING := BEGINPLAY -> ANSWERING +-> WAITING ANSWERING := RUNPLAYER -> ANSWERING + BEGINRECORD -> ANSWERING +-> WAITING ;begin output equations DUMMY.OUTF = VCC -> /ANSWER * /PLAY * /RECORD ;## WAITING.OUTF = BEGINPLAY -> ANSWER * PLAY * /RECORD +-> /ANSWER * /PLAY * /RECORD ANSWERING.OUTF = RUNPLAYER -> ANSWER * PLAY * /RECORD + BEGINRECORD -> ANSWER * /PLAY * RECORD +-> /ANSWER * /PLAY * /RECORD DUMMY = /SB1 */SB0 ;will be ok now WAITING = SB1 * SB0 ANSWERING = /SB1 * SB0 ;begin condition equations CONDITIONS BEGINPLAY = RING RUNPLAYER = /DIALTONE * /ENDGREETING * /ENDMESSAGE BEGINRECORD = /DIALTONE * ENDGREETING * /ENDMESSAGE DONE = DIALTONE + ENDMESSAGE ;----------------------------------- Simulation Segment ------------ SIMULATION TRACE_ON DIALTONE RING ENDGREETING ENDMESSAGE ANSWER PLAY RECORD SETF /CLOCK /RING DIALTONE /ENDGREETING /ENDMESSAGE CLOCKF CLOCK CHECK WAITING /ANSWER /PLAY /RECORD CLOCKF CLOCK CLOCKF CLOCK CHECK WAITING /ANSWER /PLAY /RECORD ; VERIFY HELD IN STATE WAITING SETF RING /DIALTONE ; SET CONDITION BEGINPLAY/RUNPLAYER CLOCKF CLOCK CHECK ANSWERING ANSWER PLAY /RECORD SETF /RING ; STILL CONDITION RUNPLAYER CLOCKF CLOCK CHECK ANSWERING ANSWER PLAY /RECORD SETF ENDGREETING ; CONDITION BEGINRECORD CLOCKF CLOCK CHECK ANSWERING ANSWER /PLAY RECORD CLOCKF CLOCK CLOCKF CLOCK CHECK ANSWERING ANSWER /PLAY RECORD ; VERIFY HELD IN ANSWERING SETF ENDMESSAGE ; DEFAULT CONDITION CLOCKF CLOCK CHECK WAITING /ANSWER /PLAY /RECORD CLOCKF CLOCK CLOCKF CLOCK CHECK WAITING /ANSWER /PLAY /RECORD ; HOLD IN WAITING TRACE_OFF ;-------------------------------------------------------------------