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External Memory Interface Diagram Examples B-3
Figure B.3 128 Kbytes, 256 Kbytes, 512 Kbytes, or 1 Mbyte Interface with 150 ns
Memory
LSI53C875A
27C020-15/
MOE/
OE
MCE/
CE
8
MAD[7:0]
Bus
8
A[7:0]
6
A[15:8]
V
DD
MAS0/
MAS1/
Note: MAD[2:0] pulled LOW internally. MAD bus sense logic enabled for 128, 256, 512 Kbytes, or 1 Mbyte of fast
memory (150 ns devices @ 33 MHz). The HCT374s may be replaced with HCT377s.
GPIO4
MWE/
VPP
Control
+12V
VPP
WE
Optional - for Flash Memory only, not
required for EEPROMS.
28F020-15/
Socket
D[7:0]
MAD3 4.7 K
D0
CK
Q0
Q3
4
HCT377
MAD[3:0]
Bus
E
A[19:16]
D0
CK
Q0
QE
HCT374
D7 Q7
D0
CK
Q0
QE
HCT374
D7 Q7
D3