A-6
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
On an unlocked and non-cacheable CMPXCHG8B operation,
the misaligned and aligned CMPXCHG8B operations are the
same as the locked misaligned and locked aligned
CMPXCHG8B operations, respectively, described above.
On an unlocked and cacheable CMPXCHG8B operation, the
AMD-K5 and Pentium processors behave the same.
A.2.3
Bus Cycle Order of Misaligned Memory and I/O Cycles
The AMD-K5 processor performs split (misaligned) memory
read, memory write, and I/O read cycles in the reverse order of
the Pentium processor. Split I/O write cycles occur in the same
order on both processors.
A.2.4
Halt Cycle after FLUSH
When halted, the AMD-K5 processor reruns a Halt special
cycle after the Flush Acknowledge special cycle following a
cache flush operation. The Pentium processor does not rerun a
Halt special cycle.
A.2.5
Selectable Drive Strengths on Output Driver
The AMD-K5 processor supports selectable drive strengths on
the following output pins:
■
A20–A3
■
W/R
■
ADS
■
HITM
This is the same set of output pins that have selectable drive
strengths on the Pentium processor. However, the Pentium
processor supports three drive strengths on these pins while
the AMD-K5 processor supports two.
Summary of Contents for AMD-K5
Page 1: ...AMD K5 Processor Technical Reference Manual TM...
Page 10: ...x AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 24: ...1 4 Overview AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 54: ...2 30 Internal Architecture AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 116: ...4 26 Performance AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 356: ...6 44 System Design AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 380: ...7 24 Test and Debug AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 396: ...A 16 AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 406: ...I 10 Index AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...