May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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MEMORY AND I/O DECODING 7-23
KEY POINTS OF THIS CHAPTER
l Memory mapped I/O causes I/O space to encroach on the memory address space of
the processor.
l Active low control signals prevent accidental triggering by noise voltages or open
connections.
l 74LS138 is a very popular 3 to 8 decoder.
l The number of locations in a memory chip is 2
N
, where N is the number of address lines
of the chip.
l Memory is always organized as ‘banks’.
l The BHE signal goes low when the addressed byte is in the upper bank of memory.
l The LSB of the address bus, i.e., A
0
,
is used to enable the low bank of memory.
l Memory chips have tri-state buffers and latches ...
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