Loading...
Memory Management Unit
4-10
M68060 USER’S MANUAL
MOTOROLA
Figure 4-8. Detailed Flowchart of Table Search Operation
ENTRY
SELECT ROOT POINTER
FC2 = 0:URP, 1:SRP
FETCH ROOT
DESCRIPTOR
FETCH POINTER
DESCRIPTOR
FETCH PAGE
DESCRIPTOR
TYPE 'INDIRECT'
FETCH INDIRECT
DESCRIPTOR
EXIT TABLE SEARCH
EXIT TABLE SEARCH
(INITIALIZE ACCRUED
STATUS)
CREATE ATC ENTRY
ATC ENTRY PFA, DF[U1,U0,S,CM,M],WP
ATC TAG FC2, LA, DF[G]
ABBREVIATIONS:
PFA - PAGE FRAME ADDRESS
DF[ ] - DESCRIPTOR FIELD
WP - ACCUMULATED WRITE-
PROTECTION STATUS
ASSIGNMENT OPERATOR
WP 0
TYPE 'POINTER'
UPDATE FALSE
TYPE 'PAGE'
'RESIDENT'
'INVALID'
'RESIDENT'
'INVALID' 'RESIDENT'
'RESIDENT'
OTHERWISE
'INDIRECT'
PFA = PHYSICAL ADDRESS
FIELD OF DESCRIPTOR
'INVALID'
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
Loading...
Terms of Use | Privacy Policy | DMCA Policy
2006-2020 Rsmanuals.com