AMD-K6-2E/400AFR AMD [Advanced Micro Devices], AMD-K6-2E/400AFR Datasheet - Page 131
AMD-K6-2E/400AFR
Manufacturer Part Number
AMD-K6-2E/400AFR
Description
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AMD-K6-2E400AFR.pdf
(332 pages)
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22529B/0—January 2000
5.34
Pin Attribute
Pin Location
Summary
Driven and Floated
Chapter 5
M/IO# (Memory or I/O)
Output
T-04
The processor drives M/IO# during a bus cycle to indicate
whether it is addressing the memory or I/O space. If M/IO# = 1,
the processor is addressing memory or a memory-mapped I/O
port as the result of an instruction fetch or an instruction that
loads or stores data. If M/IO# = 0, the processor is addressing an
I/O port during the execution of an I/O instruction. In addition,
M/IO# is used to define other bus cycles, including interrupt
acknowledge and special cycles. See Table 23 on page 132 for
more details.
M/IO# is driven off the same clock edge as ADS# and remains in
the same state until the clock edge on which NA# or the last
expected BRDY# of the cycle is sampled asserted. M/IO# is
driven during memory cycles, I/O cycles, special bus cycles, and
interrupt acknowledge cycles.
M/IO# is floated off the clock edge on which BOFF# is sampled
asserted and off the clock edge on which the processor asserts
HLDA in response to HOLD.
Signal Descriptions
AMD-K6™-2E Processor Data Sheet
113
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