Proprietary and Confidential to PMC-Sierra, Inc and for its Customer’s Internal Use

5

Document ID: PMC-2002175, Issue 1

RM7000™ Microprocessor with On-Chip Secondary Cache Datasheet

Released

Table of Contents

Legal Information ...........................................................................................................................2

Revision History .............................................................................................................................3

Document Conventions .................................................................................................................4

Table of Contents ..........................................................................................................................5

List of Figures ................................................................................................................................7

List of Tables .................................................................................................................................8

1

Features ..................................................................................................................................9

2

Block Diagram .......................................................................................................................10

3

Description ............................................................................................................................11

4

Hardware Overview ...............................................................................................................12

4.1

CPU Registers .............................................................................................................12

4.2

Superscalar Dispatch ...................................................................................................12

4.3

Pipeline ........................................................................................................................13

4.4

Integer Unit ..................................................................................................................14

4.5

ALU ..............................................................................................................................15

4.6

Integer Multiply/Divide ..................................................................................................15

4.7

Floating-Point Coprocessor ..........................................................................................16

4.8

Floating-Point Unit .......................................................................................................16

4.9

Floating-Point General Register File ............................................................................16

4.10 System Control Coprocessor (CP0) .............................................................................17

4.11 System Control Coprocessor Registers .......................................................................18

4.12 Virtual to Physical Address Mapping ............................................................................19

4.13 Joint TLB ......................................................................................................................20

4.14 Instruction TLB .............................................................................................................20

4.15 Data TLB ......................................................................................................................20

4.16 Cache Memory .............................................................................................................21

4.17 Instruction Cache .........................................................................................................21

4.18 Data Cache ..................................................................................................................21

4.19 Secondary Cache ........................................................................................................23

4.20 Secondary Caching Protocols ......................................................................................24

4.21 Tertiary Cache .............................................................................................................24

4.22 Cache Locking .............................................................................................................26

4.23 Cache Management .....................................................................................................26

4.24 Primary Write Buffer .....................................................................................................27

4.25 System Interface ..........................................................................................................27

4.26 System Address/Data Bus ...........................................................................................28

4.27 System Command Bus ................................................................................................28

4.28 Handshake Signals ......................................................................................................28

4.29 System Interface Operation .........................................................................................29