Intel 8XC196NT User Manual page 347

8XC196NT USER'S MANUAL
Figure 14-15 shows a 16-bit system with two Flash memories and two RAMs. It is configured to
use the write strobe mode. ALE latches the address; A19 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.
V
CC
BUSWIDTH
A19
A18:16
AD15:8
ALE
8XC196
AD7:0
RD#
WRH#
WRL#
Figure 14-15. 16-bit System with Single-byte Writes to RAM
14-28
CS#
A16:15
74AC
A15:8
373
A14:7
LE
D15:8
128K×8
RAM
(High)
LE
A7:1
74AC
A6:0
373
OE# WE#
CS# CS#
A16:15 A17:15
A14:7 A14:7
D15:8
128K×8 256K×8
RAM Flash
(Low) (High)
(28F020)
D7:0
A6:0 A6:0
OE# WE# OE#
CS#
A17:15
A14:7
256K×8
Flash
(Low)
(28F020)
D7:0
A6:0
OE#
A0288-02