MC68LC040RC25A Datasheet, PDF (59/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

3-10
Freescale Semiconductor, Inc.
ENTRY
SELECT ROOT POINTER
FC2 = 0:URP, 1:SRP
(INITIALIZE ACCRUED
STATUS)
WP 0
UPDATE FALSE
TYPE 'POINTER'
FETCH ROOT
DESCRIPTOR
(CHECK DESCRIPTOR TYPE)
'INVALID'
'RESIDENT'
FETCH POINTER
DESCRIPTOR
(CHECK DESCRIPTOR TYPE)
'INVALID'
'RESIDENT'
TYPE 'PAGE'
FETCH PAGE
DESCRIPTOR
(CHECK DESCRIPTOR TYPE)
'INVALID'
'INDIRECT'
TYPE 'INDIRECT'
'RESIDENT'
FETCH INDIRECT
DESCRIPTOR
(CHECK DESCRIPTOR TYPE)
OTHERWISE
CREATE ATC ENTRY
WITH R-BIT CLEAR
EXIT TABLE SEARCH
ABBREVIATIONS:
PFA - PAGE FRAME ADDRESS
DF[ ] - DESCRIPTOR FIELD
WP - ACCUMULATED WRITE-
PROTECTION STATUS
ASSIGNMENT OPERATOR
'RESIDENT'
PFA = PHYSICAL ADDRESS
FIELD OF DESCRIPTOR
CREATE ATC ENTRY WITH R-BIT SET
ATC TAG FC2, LA, DF[G]
ATC ENTRY PFA, DF[U1,U0,S,CM,M],WP
EXIT TABLE SEARCH
Figure 3-9. Detailed Flowchart of Table Search Operation
M68040 USER'S MANUAL
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