AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 111
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
5.18
Summary
Driven, Sampled, and
Floated
Chapter 5
DP[7:0] (Data Parity)
Bidirectional
DP[7:0] are even parity bits for each valid byte of data — as
defined by BE[7:0]#—driven and sampled on the D[63:0] data
bus. (Even parity means that the total number of 1 bits within
each byte of data and its respective data parity bit is even.)
DP[7:0] are driven by the processor during write cycles and
sampled by the processor during read cycles. If the processor
detects bad parity on any valid byte of data during a read cycle,
PCHK# is asserted for one clock beginning the clock edge after
BRDY # is sampled asserted. The processor does not take an
internal exception as the result of detecting a data parity
check, and system logic must respond appropriately to the
assertion of this signal.
The eight data parity bits correspond to the eight bytes of the
data bus as follows:
For systems that do not support data parity, DP[7:0] should be
connected to V
As Outputs: For single-transfer write cycles, the processor drives
DP[7:0] with valid parity one clock edge after the clock edge on
which ADS# is asserted and DP[7:0] remain in the same state
until the clock edge on which BRDY# is sampled asserted. If the
cycle is a writeback, DP[7:0] 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.
As Inputs: During read cycles, the processor samples DP[7:0] on
the clock edge BRDY# is sampled asserted.
The processor always floats DP[7:0] except when they are being
driven during a write cycle as described above. In addition,
DP[7:0] 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.
DP7: D[63:56]
DP6: D[55:48]
DP5: D[47:40]
DP4: D[39:32]
Signal Descriptions
CC3
through pullup resistors.
DP3: D[31:24]
DP2: D[23:16]
DP1: D[15:8]
DP0: D[7:0]
AMD-K6
®
Processor Data Sheet
93
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