AMD-K6 AMD [Advanced Micro Devices], AMD-K6 Datasheet - Page 6
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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
vi
®
Processor Data Sheet
7
8
9
6.6
Power-on Configuration and Initialization . . . . . . . . . . . . . . 167
7.1
7.2
7.3
7.4
Cache Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
Floating-Point and Multimedia Execution Units . . . . . . . . . 189
9.1
Special Bus Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Basic Special Bus Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Shutdown Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Stop Grant and Stop Clock States . . . . . . . . . . . . . . . . . . . . . 161
INIT-Initiated Transition from Protected Mode to
Real Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Signals Sampled During the Falling Transition
of RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
FLUSH# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
BF[2:0] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
BRDYC# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
RESET Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
State of Processor After RESET . . . . . . . . . . . . . . . . . . . . . . 168
Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
State of Processor After INIT . . . . . . . . . . . . . . . . . . . . . . . . 170
MESI States in the Data Cache . . . . . . . . . . . . . . . . . . . . . . . 172
Predecode Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Cache Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Cache-Related Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Cache Disabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Cache-Line Fills . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Cache-Line Replacements . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Write Allocate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Write to a Cacheable Page . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Write to a Sector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Write Allocate Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Descriptions of the Logic Mechanisms and Conditions . . . . 180
Prefetching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Cache States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Cache Coherency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Inquire Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Internal Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
FLUSH# . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
WBINVD and INVD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Cache-Line Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Cache Snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Writethrough vs. Writeback Coherency States . . . . . . . . . . 187
A20M# Masking of Cache Accesses . . . . . . . . . . . . . . . . . . . 187
Floating-Point Execution Unit . . . . . . . . . . . . . . . . . . . . . . . 189
Handling Floating-Point Exceptions . . . . . . . . . . . . . . . . . . . 189
External Logic Support of Floating-Point Exceptions . . . . . 189
Preliminary Information
20695H/0—March 1998
Contents
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