PAL16R4
PAT8039          **-1110-**          MK,85-02-11
DS60 NS32081 FLOATING POINT PROCESSOR INTERFACE

CLK WRT FAS FPP A07 A06 NC1 NC2 NC3 GND
 OE SPC NC4 C01 C00 EPC DON NC5 D00 VCC

;EQUATIONS:

         /C01 := /C00
         /C00 := /FPP*/FAS*/A07* C01

         /EPC := /FPP*/FAS*/WRT*/A07* C01 +
                 /FPP*/FAS* WRT*/A07 +
                 /EPC*/C00* C01 +
                 /EPC*/C00* WRT

         /DON :=  EPC*/SPC +
                  EPC*/DON +
                 /WRT*/DON

IF(/EPC) /SPC  = /C00* C01*/WRT +
                 /C00* WRT

IF(/FPP*/FAS* WRT* A07) /D00 = DON

FUNCTION TABLE:

CLK OE FPP WRT A07 FAS SPC C00 C01 EPC DON D00
 
---------------------
;C  FWA F S  CC ED D
;LO PR0 A P  00 PO 0
;KE PT7 S C  01 CN 0
;--------------------INITIALIZE
 CH XXX H Z  ZZ ZZ Z
 CL HXX H X  HX XX Z
 CL HHX H X  HH HX Z
 CL HHH H H  HH HX Z
;--------------------READ
 CL LHL L L  LH LX Z
 CL LHL L L  LL LH Z
 CL LHL L H  HL LH Z
 CL XHX H H  HH HH Z
;--------------------WRITE
 CL HXX H L  HH HL Z
 CL LLL L L  LH LL Z
 CL LLL L H  LL LL Z
 CL LLL L H  HL HL Z
 CL XXX H H  HH HL Z
;--------------------CATCH SPC AND READ STATUS
 CL XXX H L  HH HL Z
 CL XHX H H  HH HL Z
 CL LHH L H  HH HL H
 CL LHH L H  HH HL H
 CL LHH L H  HH HL H
 CL XHH H H  HH HL Z
;--------------------READ
 CL LHL L L  LH LL Z
 CL LHL L L  LL LH Z
 CL LHL L H  HL LH Z
 CL XHL H H  HH HH Z
;--------------------READ STATUS AGAIN
 CL LHH L H  HH HH L
---------------------
DESCRIPTION:

A07 = 1 -> DONE FF ACCESS
A07 = 0 -> FPP REGISTER ACCESS