Intel 8XC196NT User Manual page 345

8XC196NT USER'S MANUAL
Figure 14-13 shows a system that uses the dynamic bus-width feature. (The CCR bits, BW0 and
BW1, are set.) Code is executed from the two flash memories and data is stored in the byte-wide
RAM. The RAM is in low memory. It is selected by driving A19 low, which also selects the 8-
bit bus-width mode by driving the BUSWIDTH signal low.
A19
BUSWIDTH
A17:16
AD15:8
ALE
8XC196
AD7:0
RD#
WR#
Figure 14-13. 16-bit System with Dynamic Bus Width
14-26
A19
A16:15
A15:8
74AC
A14:7
373
LE
D15:8
128K×8
Flash
(High)
LE
(28F010)
A7:1
74AC
A6:0
373
OE#
CS#
CS#
A16:15
A14:7
D7:0
128K×8
Flash
(Low)
(28F010)
A7:1
A6:0
OE#
A19
CS#
A16
A15:8
D7:0
128K×8
RAM
A7:0
A7:0
OE# WE#
A0286-02