Write Strobe Mode - Intel 8XC196NT User Manual

14.7.2 Write Strobe Mode

The write strobe mode eliminates the need to externally decode high- and low-byte writes to an
external 16-bit RAM or Flash device in 16-bit bus mode. When the write strobe mode is selected,
the device generates WRL# and WRH# instead of WR# and BHE#. WRL# is asserted for all low
byte writes (even addresses) and all word writes. WRH# is asserted for all high byte writes (odd
addresses) and all word writes. In the 8-bit bus mode, WRH# and WRL# are asserted for both
even and odd addresses. Figure 14-14 shows write strobe mode timing.
ALE
WRL#
WRH#
AD15:0
Address
A19:16 Extended Address
16-bit Bus Cycle
INTERFACING WITH EXTERNAL MEMORY
Valid
WRL# and WRH#
AD7:0
Valid
AD15:8
Data Out
A19:16
Figure 14-14. Write Strobe Mode
ALE
Address Low Data Out
Address High
Extended Address
8-bit Bus Cycle
A0287-02
14-27