AMD-K6-IIIE+550ACR AMD (ADVANCED MICRO DEVICES), AMD-K6-IIIE+550ACR Datasheet - Page 120
AMD-K6-IIIE+550ACR
Manufacturer Part Number
AMD-K6-IIIE+550ACR
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet
1.AMD-K6-IIIE550ACR.pdf
(370 pages)
Specifications of AMD-K6-IIIE+550ACR
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AMD-K6™-IIIE+ Embedded Processor Data Sheet
5.7
Pin Attribute
Summary
Driven, Sampled, and
Floated
98
AP (Address Parity)
Bidirectional
AP contains the even parity bit for cache line addresses driven
and sampled on A[31:5]. Even parity means that the total
number of 1 bits on AP and A[31:5] is even. (A4 and A3 are not
used for the generation or checking of address parity because
these bits are not required to address a cache line.) AP is driven
by the processor during processor-initiated cycles and is
sampled by the processor during inquire cycles. If AP does not
reflect even parity during an inquire cycle, the processor
asserts APCHK # to indicate an address bus parity check. The
processor does not take an internal exception as the result of
detecting an address bus parity check, and system logic must
respond appropriately to the assertion of this signal.
As an Output: The processor drives AP valid off the clock edge
on which ADS# is asserted until the clock edge on which NA# or
the last expected BRDY# of the cycle is sampled asserted. AP is
driven during memory cycles, I/O cycles, special bus cycles, and
interrupt acknowledge cycles. The processor continues to drive
AP while the bus is idle.
As an Input: The processor samples AP during inquire cycles on
the clock edge on which EADS# is sampled asserted.
The processor floats AP off the clock edge that AHOLD or
BOFF # is sampled asserted and off the clock edge that the
processor asserts HLDA in recognition of HOLD.
The processor resumes driving AP off the clock edge on which
the processor samples AHOLD or BOFF # negated and off the
clock edge on which the processor negates HLDA.
Preliminary Information
Signal Descriptions
23543A/0—September 2000
Chapter 5
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