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286Racer/CIRCUITS/MEMPAL.SI
Philip Smart 7daa2da009 First push
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Name Memory system control PAL;
Partno MEM 1;
Date 23/02/88;
Revision 01;
Designer P.D. Smart;
Company Feduptronics;
Assembly XXXXX;
Location XXXXX;
/******************************************************************/
/* A PAL to glue the memory system to the 286 CPU. */
/* */
/******************************************************************/
/* Allowable Target Device Types: 20RS4 */
/******************************************************************/
ORDER: PSEN, %2, DTR, %1, DEN, %2, BHE, %1, A0, %1, NotPSEN, %1, WE, %2,
MIO, %1, A19, %1, ROME, %1, EAACK, %3,
PSENInv, %1, ReadMem, %1, EvenWR, %1, OddWR, %1, PE, %1, CRDY;
VECTORS:
$msg " **INPUTS** *OUTPUT* ";
$msg " ";
$msg " N P R ";
$msg " o S e E ";
$msg " t E E a v O ";
$msg " P P R A N d e d C ";
$msg " E D D B S M A O A I M n d R ";
$msg " S T E H A E W I 1 M C n e W W P D ";
$msg " N R N E 0 N E O 9 E K v m R R E Y ";
$msg " ----------------------------------------";
0 X X X X X X X X X X H X X X X X /* Test invertor */
1 X X X X X X X X X X L X X X X X
X 1 1 X X X X X X X X X H X X X X /* Testing memory read latch enabling */
X 1 0 X X X X X X X X X H X X X X
X 0 1 X X X X X X X X X L X X X X
X 0 0 X X X X X X X X X H X X X X
X X X X X X X 0 0 0 0 X X X X H L /* Testing 8207 enabling. Should only */
X X X X X X X 0 0 1 0 X X X X H L /* be enabled if a Memory access, and */
X X X X X X X 0 1 0 0 X X X X H L /* the ROM is disabled, or if ROM */
X X X X X X X 0 1 1 1 X X X X H L /* enabled, should only be enabled if */
X X X X X X X 1 0 0 1 X X X X L H /* A19 = 0 */
X X X X X X X 1 0 1 1 X X X X L H
X X X X X X X 1 1 0 1 X X X X L H
X X X X X X X 1 1 1 0 X X X X H L
X X X 1 1 C 0 X X X X X X H H X X /* Test WRITE output strobes. */
X X X 1 0 C 0 X X X X X X H H X X
X X X 0 1 C 0 X X X X X X H H X X
X X X 0 0 C 0 X X X X X X H H X X
X X X 1 1 C 1 X X X X X X H H X X
X X X 1 0 C 1 X X X X X X L H X X
X X X 0 1 C 1 X X X X X X H L X X
X X X 0 0 C 1 X X X X X X L L X X