AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 146
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
Misaligned
Single-Transfer
Memory Read and
Write
128
®
Processor Data Sheet
Figure 46 on page 129 shows a misaligned (split) memory read
followed by a misaligned memory write. Any cycle that is not
aligned as defined in “SCYC (Split Cycle)” on page 111 is
considered misaligned. When the processor encounters a
misaligned access, it determines the appropriate pair of bus
cycles — each with its own ADS# and BRDY# — required to
complete the access.
The AMD-K6 processor performs misaligned memory reads and
memory writes using least-significant bytes (LSBs) first
followed by most-significant bytes (MSBs). Table 20 shows the
order. In the first memory read cycle in Figure 46, the processor
reads the least-significant bytes. Immediately after the
processor samples BRDY# asserted, it drives the second bus
cycle to read the most-significant bytes to complete the
misaligned transfer.
Table 20. Bus-Cycle Order During Misaligned Transfers
Similarly, the misaligned memory write cycle in Figure 46
transfers the LSBs to the memory bus first. In the next cycle,
after the processor samples BRDY# asserted, the MSBs are
written to the memory bus.
Type of Access
Memory Write
Memory Read
Preliminary Information
Bus Cycles
First Cycle
LSBs
LSBs
Second Cycle
MSBs
MSBs
20695H/0—March 1998
Chapter 6
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