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The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
book

The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition

by Lyla B. Das
May 2024
Intermediate to advanced content levelIntermediate to advanced
665 pages
23h 2m
English
Pearson India
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
MEMORY AND I/O DECODING 239
Note the above instruction which initiates a read cycle. It is the case of reading a byte. Only
the even (low) bank need be enabled to read. However, even if the high bank is also enabled, it
does not matter.  e data present on the lines D
8
to D
15
will not be used by the processor. It takes
into AL, only the data on lines D
0
to D
7
and ignores the data on the upper bus. However, the
writing process creates a problem. Observe the case of the following write instruction:
MOV [0000], AL
is should cause only the even bank to be enabled. If the odd (upper) bank also gets enabled,
the logic levels on the data lines ...
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Publisher Resources

ISBN: 9781282663169