MOTOROLA
Chapter 8. Instruction and Data Caches
8-3
Part II. PowerPC Microprocessor Module
Figure 8-1. Instruction Cache Organization
Each instruction cache block contains four contiguous words from memory that are loaded
from a four-word boundary (that is, bits A[28Ð31] of the logical (effective) addresses are
zero); as a result, cache blocks are aligned with page boundaries. Also, address bits
A[21Ð27] provide the index to select a set, and bits A[28Ð29] select a word within a block.
The tags consist of the high-order physical address bits PA[0Ð20]. Address translation
occurs in parallel with set selection (from A[21Ð27]).
COMP
way0
28
29
27
21
20
0
Word select
Bidirectional multiplexer 2 -> 1
hit0
HIT
Instruction effective address
. .
. .
. .
. .
set0
set1
set127
set126
COMP
tag0
w0 w1 w2 w3
V
alid bit
Loc
k bit
tag1
w0 w1 w2 w3
tag127
w0 w1 w2 w3
tag126
w0 w1 w2 w3
. . .
. . .
. . .
. . .
L
R
U
A
r
r
a
y
. .
. .
. .
. .
hit1
To block buffer/
From burst buffer
2
w2
tag0
w0 w1 w2 w3
way1
tag1
w0 w1 w2 w3
tag127
w0 w1 w2 w3
tag126
w0 w1 w2 w3
. . .
. . .
. . .
. . .
V
alid bit
Loc
k bit
w2
MMU
7
21
21
128
128
21
128
Summary of Contents for MPC860 PowerQUICC
Page 3: ...MPC860UM AD 07 98 REV 1 MPC860 PowerQUICC ª UserÕs Manual ...
Page 36: ...xxxvi MPC860 PowerQUICC UserÕs Manual MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 88: ...1 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 114: ...3 16 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 262: ...9 36 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
Page 274: ...III iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 320: ...12 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part III Configuration ...
Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
Page 326: ...IV vi MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 352: ...13 26 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 394: ...14 42 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 426: ...15 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 530: ...17 26 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part IV Hardware Interface ...
Page 632: ...21 44 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 660: ...22 28 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 708: ...24 24 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 748: ...27 20 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 846: ...31 20 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 914: ...35 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 948: ...36 34 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part V The Communications Processor Module ...
Page 998: ...37 48 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part VI Debug and Test ...
Page 1016: ...A 10 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1024: ...B 8 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1030: ...C 6 MPC860 PowerQUICC UserÕs Manual MOTOROLA Appendixes ...
Page 1086: ...Glossary 12 MPC860 PowerQUICC UserÕs Manual MOTOROLA ...
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