NEC Network Controller uPD98502 User Manual

Page 86

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CHAPTER 2 V

R

4120A

86

Preliminary User’s Manual S15543EJ1V0UM

Table 2-22. Operation in Each Stage of Pipeline (MIPS III)

Cycle

Phase

Mnemonic

Description

IF

Φ1

IDC

Instruction cache address decode

ITLB

Instruction address translation

Φ2

ICA

Instruction cache array access

ITC

Instruction tag check

RF

Φ1

IDEC

Instruction decode

Φ2

RF

Register operand fetch

BAC

Branch address calculation

EX

Φ1

EX

Execution stage

DVA

Data virtual address calculation

SA

Store align

Φ2

DCA

Data cache address decode/array access

DTLB

Data address translation

DC

Φ1

DLA

Data cache load align

DTC

Data tag check

DTD

Data transfer to data cache

WB

Φ1

DCW

Data cache write

WB

Write back to register file

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