AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 176
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
6.6
Basic Special Bus
Cycle
158
®
Processor Data Sheet
Special Bus Cycles
The AMD-K6 processor drives special bus cycles that include
stop grant, flush acknowledge, cache writeback invalidation,
halt, cache invalidation, and shutdown cycles. During all
special cycles, D/C# = 0, M/IO# = 0, and W/R# = 1. BE[7:0]# and
A[31:3] are driven to differentiate among the special cycles, as
shown in Table 24. The system logic must return BRDY# in
response to all processor special cycles.
Table 24. Encodings For Special Bus Cycles
Figure 62 on page 159 shows a basic special bus cycle. The
processor drives D/C# = 0, M/IO# = 0, and W/R# = 1 off the same
clock edge that it asserts ADS#. In this example, BE[7:0]# = FBh
and A[31:3] = 0000_0000h, which indicates that the special
cycle is a halt special cycle (See Table 24). A halt special cycle is
generated after the processor executes the HLT instruction.
If the processor samples FLUSH# asserted, it writes back any
data cache lines that are in the modified state and invalidates
all lines in the instruction and data cache. The processor then
drives a flush acknowledge special cycle.
If the processor executes a WBINVD instruction, it drives a
writeback special cycle after the processor completes
invalidating and writing back the cache lines.
Note:
BE[7:0]#
FDh
FBh
FBh
EFh
F7h
FEh
*
A[31:5] = 0
Preliminary Information
A[4:3]*
10b
00b
00b
00b
00b
00b
Bus Cycles
Stop Grant
Flush Acknowledge FLUSH# sampled asserted
Writeback
Halt
Flush
Shutdown
Special Bus Cycle
STPCLK# sampled asserted
WBINVD instruction
HLT instruction
INVD,WBINVD instruction
Triple fault
Cause
20695H/0—March 1998
Chapter 6
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