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8XC196MC, MD, MH USER’S MANUAL
15-26
Figure 15-15 shows a 16-bit system with two EPROMs and two RAMs. It is configured to use
the write strobe mode. ALE latches the address; AD15 is the chip-select signal for the memory
devices. WRL# is asserted during low byte writes and word writes. WRH# is asserted during high
byte writes and word writes. Note that the RAM devices do not use AD0. WRL# and WRH# de-
termine whether the low byte (AD0=0) or high byte (AD0=1) is selected.
Figure 15-15. 16-bit System with Writes to Byte-wide RAMs
A3090-01
AD15:8
ALE
AD7:0
8XC196
RD#
WRH#
WRL#
74AC
373
74AC
373
CS#
OE#
CS#
OE#
CS#
OE#
WE#
CS#
OE#
WE#
8K×8
RAM
(Low)
D7:0
A6:0
D7:0
A6:0
8K×8
RAM
(High)
D15:8
A6:0
16K×8
EPROM
(Low)
16K×8
EPROM
(High)
D15:8
A6:0
BUSWIDTH
V
CC
A12:7A12:7
A13:7
A13:7
A7:1
A14:8
LE
LE
A15