AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 109
AMD-K6
Manufacturer Part Number
AMD-K6
Description
AMD-K6 Processor
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AMD-K6.pdf
(346 pages)
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20695H/0—March 1998
5.15
Summary
Sampled
5.16
Summary
Driven and Floated
Chapter 5
CLK (Clock)
D/C# (Data/Code)
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 86 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 241 for
details regarding the CLK specifications.
Output
The processor drives D/C # during a memory bus cycle to
indicate whether it is addressing data or executable code. D/C#
is also used to define other bus cycles, including interrupt
acknowledge and special cycles. (See Table 19 on page 119 for
more details.)
D/C# 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. D/C # is
driven during memory cycles, I/O cycles, special bus cycles, and
interrupt acknowledge cycles.
D/C # 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.
Signal Descriptions
AMD-K6
®
Processor Data Sheet
91
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