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dcount.pds
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1987-08-26
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4KB
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90 lines
Title 5-Bit Down Counter
Pattern DCount.pds
Revision B
Author Bill Karkula
Company Monolithic Memories Inc., Sanat Clara, CA
Date 8/1/86
CHIP DN_COUNTER PAL20RA10
/PL D4 D3 D2 D1 D0 CK NC /LD /LR /RST GND
/OE R0 R1 R2 R3 R4 Q0 Q1 Q2 Q3 Q4 VCC
EQUATIONS
/Q4 := Q4 ;Toggle if lower MSB
Q4.CLKF = Q3 ;becomes a one
Q4.SETF = RST ;Rollover/master RST
Q4.RSTF = /D4*LD ;Load initial count
/Q3 := Q3 ;Toggle when Q2
Q3.CLKF = Q2 ;Becomes a one
Q3.SETF = RST ;Rollover/master RST
Q3.RSTF = /D3*LD ;Load initial count
/Q2 := Q2 ;Toggle when Q1
Q2.CLKF = Q1 ;becomes a one
Q2.SETF = RST ;Rollover/master RST
Q2.RSTF = /D2*LD ;Load initial count
/Q1 := Q1 ;Toggle when Q0
Q1.CLKF = Q0 ;becomes a one
Q1.SETF = RST ;Rollover/master RST
Q1.RSTF = /D1*LD ;Load initial count
/Q0 := Q0 ;Toggle LSB
Q0.CLKF = CK ;External clock input
Q0.SETF = RST ;Rollover/master RST
Q0.RSTF = /D0*LD ;Load initial count
/R4 := /D4 ;Load rollover point
R4.CLKF = LR ;if /LR is low
/R3 := /D3 ;Load rollover bit 3
R3.CLKF = LR ;if /LR is asserted
/R2 := /D2 ;Load rollover bit 2
R2.CLKF = LR ;if /LR is asserted
/R1 := /D1 ;Load rollover bit 1
R1.CLKF = LR ;if /LR is asserted
/R0 := /D0 ;Load rollover bit 0
R0.CLKF = LR ;if /LR is asserted
SIMULATION
TRACE_ON PL OE CK Q0 Q1 Q2 Q3 Q4
SETF /PL OE /RST /CK /LD /LR
SETF RST LR CK D4 D3 D2 D1 D0 ;Test SET function of registers
CHECK /Q0 /Q1 /Q2 /Q3 /Q4 ;Check for high on
;register outputs
SETF /RST ;Deassert SET funct
SETF /D0 /D1 /D2 /D3 /D4 LD ;Test RESET funct.
CHECK Q0 Q1 Q2 Q3 Q4
SETF /OE /Q4 /Q3 /Q2 /Q1 Q0 /LD ;Disable RESET, load
;registers w/ LLLLH,
;tristate registers
SETF PL ;Load regs w/ data
;on output bus.
SETF OE /PL ;Disable PRELOAD &
;TRISTATE function.
FOR I:=1 TO 7 DO ;Initially load regs
BEGIN ;w/ LLLLH & clocked
SETF CK ;7 times.
SETF /CK ;Rollover at I=2
IF I=2 THEN ;count goes LLLLL
BEGIN ;to HHHHH.
CHECK /Q4 /Q3 /Q2 /Q1 /Q0 ;Check rollover pt.
END
IF I=6 THEN
BEGIN
CHECK Q4 Q3 Q2 /Q1 /Q0
END
IF I=7 THEN
BEGIN
CHECK Q4 Q3 /Q2 Q1 Q0
END
END
TRACE_OFF