PAL16L8
PAT8035          **-1110-**          MK,85-02-22
DS60 RAM DATA PATH CONTROL

AT1 FAS ES1 LLE ULE ES0 DEF UDS LDS GND
AT0 UDE LDE RAM DAS AEL DEL DIR BER VCC

;EQUATIONS:

IF(VCC)       /UDE = /RAM*/DAS*/FAS* DIR +
                     /RAM* ES1*/ES0* ULE*/DIR

IF(VCC)       /LDE = /RAM*/DAS*/FAS* DIR +
                     /RAM* ES1*/ES0* LLE*/DIR

IF(VCC)       /AEL =  AT1*/FAS*/RAM*/DAS +
                     /AT0*/DIR*/FAS*/RAM*/DAS 

IF(VCC)       /DEL = /DEF*/RAM*/FAS*/DAS +
                     /DEL*/RAM*/DAS

IF(/RAM*/FAS) /BER = /AEL +
                     /DEL

FUNCTION TABLE:

RAM DIR FAS DAS AT1 AT0 ES1 ES0 ULE LLE DEF
UDE LDE AEL DEL BER

;R DFD AA EE UL D   UL AD B
;A IAA TT SS LL E   DD EE E
;M RSS 10 10 EE F   EE LL R
----------------------------
 H XXX XX XX XX X   HH HH Z
 L XLH XX XX XX H   HH HH H
 L HLL LX XX XX H   LL HH H
 L HLL LX XX XX L   LL HL L
 L HLL HX XX XX H   LL LL L
 L HHL XX XX XX H   HH HL Z
 L LLX LH XX LL H   HH HH H
 L LLX LH LX HH H   HH HH H
 L LLX LH HL LL H   HH HH H
 L LLX LH HL HH H   LL HH H
 L LLX LH HL HL H   LH HH H
 L LLX LH HL LH H   HL HH H
 L LLL LL HH HH H   HH LH L ;10
 L LLL LH HH XX L   HH HL L
----------------------------

DESCRIPTION:

THIS DEVICE CONTROLS DATA TRANSCEIVERS LOCATED
BETWEEN CPU DATA BUS AND MEMORY DATA BUS.
IT PERFORMS ACCESS PROTECTION AS WELL, GENERATING
"BUS ERROR" SIGNAL ON PROHIBITED MEMORY ACCESSES.

INPUT SIGNALS:

FAS - FIXED ADDRESS STROBE              (ACTIVE LOW)
DAS - DELAYED  "      "                    "     "
ES0 - EDAC CONTROL S0 (INVERTED)
ES1 -  "      "    S1
ULE - UPPER MEMORY LATCH ENABLED           "     "
LLE - LOWER   "      "     "               "     "
DEF - UNCORRECTABLE ERROR FLAG             "     "
UDS - UPPER DATA STROBE (FROM CPU)         "     "
LDS - LOWER   "     "      "   "           "     "
DIR - DIRECTION TO MEMORY                  "     "
RAM - RAM CYCLE                            "     "
AT1 - ATTRIBUTE BIT 1 (EXISTING)           "     "
AT0 -     "      "  0 (WRITE PROTECTED)    "     "

OUTPUT SIGNALS:

UDE - UPPER DATA ENABLE                    "     "
LDE - LOWER   "    "                       "     "
AEL - ACCESS ERROR LATCH                   "     "
DEL - DOUBBLE MEMORY ERROR LATCH           "     "
BER - BUS ERROR                            "     "