AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 110
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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AMD-K6
5.17
Summary
Driven, Sampled, and
Floated
92
®
Processor Data Sheet
D[63:0] (Data Bus)
Bidirectional
D[63:0] represent the processor’s 64-bit data bus. Each of the
eight bytes of data that comprise this bus is qualified as valid
by its corresponding byte enable. (See “BE[7:0]# (Byte
Enables)” on page 85.)
As Outputs: For single-transfer write cycles, the processor drives
D[63:0] with valid data one clock edge after the clock edge on
which ADS# is asserted and D[63:0] remain in the same state
until the clock edge on which BRDY# is sampled asserted. If the
cycle is a writeback—in which case four, 8-byte transfers
occur—D[63:0] are driven one clock edge after the clock edge
on which ADS# is asserted and are subsequently changed off
the clock edge on which each BRDY# assertion of the burst
cycle is sampled.
If the assertion of ADS# represents a pipelined write cycle that
follows a read cycle, the processor does not drive D[63:0] until it
is certain that contention on the data bus will not occur. In this
case, D[63:0] are driven the clock edge after the last expected
BRDY# of the previous cycle is sampled asserted.
As Inputs: During read cycles, the processor samples D[63:0] on
the clock edge on which BRDY# is sampled asserted.
The processor always floats D[63:0] except when they are being
driven during a write cycle as described above. In addition,
D[63:0] are floated off the clock edge that BOFF # is sampled
asserted and off the clock edge that the processor asserts
HLDA in recognition of HOLD.
Preliminary Information
Signal Descriptions
20695H/0—March 1998
Chapter 5
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