Avago Technologies LSI53C876E - Manual (Page 303)

External Memory Interface Diagram Examples B-3
Figure B.3 256 Kbyte Interface with 150 ns Memory
LSI53C876
27C020-15/
MOE/
OE
MCE/
CE
8
MAD[7:0]
Bus
8
A[7:0]
8
A[15:8]
8
MAS0/
MAS1/
8
Notes: MAD bus sense logic enabled for 256 Kbytes of fast memory (150 ns device @ 33 MHz). MAD[2:0] pulled
LOW internally. The HCT374s may be replaced with HCT377s.
GPIO4
MWE/
V
PP
Control
+ 12 V
V
PP
WE
Optional - for Flash Memory only, not
required for EEPROMS.
28F020-15/
Socket
D[7:0]
4
4
A[17:16]
V
SS
MAD2 4.7 K
MAD1 4.7 K
D0
D7
Q0
Q7
HCT374
CK 0E
D0
D7
Q0
Q7
HCT374
CK 0E
D0
D3
Q0
Q3
HCT377
CK 0E
MAD[3:0] Bus