Intel 8XC196K Series User Manual page 372

Figure 15-12 shows a system that uses the dynamic bus-width feature. (The CCR bits, BW0 and
BW1, are set.) Code is executed from the two EPROMs and data is stored in the byte-wide RAM.
The RAM is in high memory. It is selected by driving AD15 high, which also selects the 8-bit bus
width mode by driving the BUSWIDTH signal low.
BUSWIDTH
AD15:8
ALE
8XC196
AD7:0
RD#
WR#
Figure 15-12. 16-bit System with Dynamic Bus Width
A15
A14:8
74AC
A13:7
373
LE
D15:8
16K×8
EPROM
(High)
LE
A7:1
74AC
A6:0
373
OE#
INTERFACING WITH EXTERNAL MEMORY
CS#
CS#
A14:8
A13:7
D7:0
16K×8
EPROM
(Low)
A7:1
A6:0
OE#
CS#
A12:8
A12:8
D7:0
8K×8
RAM
A7:0
A7:0
OE# WE#
A3087-01
15-23