The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson

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THE

x86 MICROPROCESSORS

7.3.3 | Using Separate Write Strobes

Another approach is used to enable memory banks, and it is by generating separate write

strobes. Now that the problem has been identified to be associated with ‘writing’, there

is another way to solve it, and it is by generating separate write strobes.

We can use the logic shown in Fig. 7.14. When there is the necessity to write a byte

to the high order (upper) bank, only the HWR (High write) signal will be enabled –

similarly, for writing a byte to the lower bank, only that bank will be enabled, but for writing

a word, both banks get enabled. Only the write control signal is taken ...