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1987-08-26
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3KB
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171 lines
TITLE PAL_B
PATTERN B8ZS ENCODER PAL B
REVISION 1.03
AUTHOR THERESA SHAFER
COMPANY MMI
DATE 10/3/86
CHIP PAL_B PAL16R6
NRZ_CK /RST NRZ_IN C2 C1 C0 NRZ_DELAY NC NC GND
/OE NC CS NPO PPO Q0 Q1 Q2 NC VCC
;
; INPUTS: NRZ_CK EXTERNAL CLOCK
; /OE ACTIVE LOW OUTPUT ENABLE SIGNAL
; /RST ACTIVE LOW MASTER RESET SIGNAL
; NRZ_DELAY SERIAL NRZ DATA STREAM WHICH WAS DELAYED
; BY PAL A
; C2 - C0 COUNTER OUTPUTS
; NRZ_IN NRZ DATA STREAM INDICATES AN
; 8-BIT STREAM OF ALL ZERO WHEN
; COUNTER OUTPUTS ARE 111 AND NRZ_IN = 0
; OUTPUTS: CS CURRENT STATE
; PPO POSITIVE B8ZS CODE
; NPO NEGATIVE B8ZS CODE
; Q2 - Q0 B8ZS SEQUENCE STATE MACHINE STATES
EQUATIONS
; B8ZS ENCODING STATE MACHINE EQUATIONS
; STATE VARIATES = [CS,PPO,NPO]
; WITH THE FOLLOWING STATE ASSIGNMENT
; P_ZERO = [0,0,0]
; NEGATIVE = [1,0,1]
; N_ZERO = [1,0,0]
; POSITIVE = [0,1,0]
/CS := /CS * /NPO * /Q1 * Q0
+ CS * /PPO * Q1 * /Q0
+ /CS * /NPO * /NRZ_DELAY * /Q1
+ /CS * /NPO * Q2 * /Q1
+ CS * NRZ_DELAY * /PPO * /Q2 * /Q0
+ RST
/PPO := CS * /PPO * Q0 * /Q1
+ /CS * /NPO * /Q0
+ CS * /NRZ_DELAY * /PPO * /Q1
+ CS * /PPO * Q2 * /Q1
+ RST
/NPO := /CS * /NPO * /Q1 * Q0
+ /CS * /NPO * /NRZ_DELAY * /Q1
+ /CS * /NPO * Q2 * /Q1
+ CS * /PPO * /Q0
+ RST
; B8ZS SEQUENCE STATE MACHINE EQUATIONS
; STATE VARIATES [Q2,Q1,Q0]
; WITH THE FOLLOWING STATE ASSIGNMENTS
; A = [0,0,0]
; B = [0,0,1]
; C = [0,1,0]
; D = [1,0,0]
; E = [1,0,1]
; F = [1,1,0]
/Q2 := /Q2 * /Q1
+ Q2 * Q1
+ RST
/Q1 := /Q0
+ Q2 * Q1
+ RST
/Q0 := /Q2 * /Q1 * /Q0 * /C2
+ /Q2 * /Q1 * /Q0 * /C1
+ /Q2 * /Q1 * /Q0 * /C0
+ /Q2 * /Q1 * /Q0 * NRZ_IN
+ Q0
+ Q1
+ RST
; .........................................................
; .........................................................
SIMULATION
TRACE_ON NRZ_CK /OE /RST NRZ_DELAY NRZ_IN C2 C1 C0
CS PPO NPO Q2 Q1 Q0
SETF OE ; ENABLE OUTPUT
RST ; RESET
CLOCKF NRZ_CK
; INITIALIZE
SETF NRZ_DELAY
/RST
NRZ_IN /C2 /C1 /C0
CLOCKF NRZ_CK
; HOLD AND DO NONE THING
SETF /NRZ_DELAY
/NRZ_IN /C2 /C1 /C0
CLOCKF NRZ_CK
SETF NRZ_DELAY
/C2 /C1 C0
CLOCKF NRZ_CK
SETF NRZ_DELAY
/C2 C1 /C0
CLOCKF NRZ_CK
SETF NRZ_DELAY
/C2 C1 C0
CLOCKF NRZ_CK
SETF /NRZ_DELAY
C2 /C1 /C0
CLOCKF NRZ_CK
SETF /NRZ_DELAY
C2 /C1 C0
CLOCKF NRZ_CK
SETF /NRZ_DELAY
C2 C1 /C0
CLOCKF NRZ_CK
SETF /NRZ_DELAY
C2 C1 /C0
CLOCKF NRZ_CK
SETF C2 C1 C0
CLOCKF NRZ_CK
SETF /C2 /C1 /C0
CLOCKF NRZ_CK
FOR I:=0 TO 5 DO
BEGIN
CLOCKF NRZ_CK
END
SETF /C2 /C1 /C0
NRZ_DELAY
CLOCKF NRZ_CK
SETF /NRZ_DELAY
CLOCKF NRZ_CK
SETF /NRZ_DELAY
CLOCKF NRZ_CK
SETF /NRZ_DELAY
CLOCKF NRZ_CK
SETF C2 C1 C0
/NRZ_DELAY
CLOCKF NRZ_CK
SETF /C2 /C1 /C0
/NRZ_DELAY
CLOCKF NRZ_CK
FOR I:=0 TO 5 DO
BEGIN
CLOCKF NRZ_CK
END
SETF /NRZ_DELAY
NRZ_IN C2 C1 /C0
CLOCKF NRZ_CK
SETF C2 C1 C0
CLOCKF NRZ_CK
SETF /C2 /C1 /C0
CLOCKF NRZ_CK
FOR I:=0 TO 5 DO
BEGIN
CLOCKF NRZ_CK
END
TRACE_OFF