AMD-K6-IIIE+550ACR AMD (ADVANCED MICRO DEVICES), AMD-K6-IIIE+550ACR Datasheet - Page 127
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
Lead Free Status / RoHS Status
Not Compliant
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23543A/0—September 2000
5.15
Pin Attribute
Summary
Driven and Floated
5.16
Pin Attribute
Summary
Sampled
Chapter 5
CACHE# (Cacheable Access)
CLK (Clock)
Output
For reads, CACHE# is asserted to indicate the cacheability of
the current bus cycle. In addition, if the processor samples
KEN # assert ed, which indicates t he driven address is
cacheable, the cycle is a 32-byte burst read cycle. For write
cycles, CACHE# is asserted to indicate the current bus cycle is a
modified cache-line writeback. KEN # is ignored during
writebacks. If CACHE# is not asserted, or if KEN # is sampled
negated during a read cycle, the cycle is not cacheable and
defaults to a single-transfer cycle.
CACHE# 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.
CACHE # is floated off the clock edge that BOFF # is sampled
asserted and off the clock edge that the processor asserts HLDA
in recognition of HOLD.
Input
The CLK signal is the bus clock for the processor and is the
reference for all signal timings under normal operation (except
for TDI, TDO, TMS, and TRST#). BF[2:0] determine the internal
frequency multiplier applied to CLK to obtain the processor’s
core operating frequency. See “BF[2:0] (Bus Frequency)” on
page 101 for a list of the processor-to-bus clock ratios.
The CLK signal must be stable a minimum of 1.0 ms prior to the
negation of RESET to ensure the proper operation of the
processor. See “CLK Switching Characteristics” on page 298 for
details regarding the CLK specifications.
Signal Descriptions
AMD-K6™-IIIE+ Embedded Processor Data Sheet
105
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