Renesas SuperH SH-4A User Manual

Rev. 1.50, 10/04, page 135 of 448
Figure 7.10 shows a flowchart of a memory access using the ITLB.
Yes
Yes
No
No
No
Yes
Yes
Yes
No
Internal resource access
1
0
1
0
CCR.ICE?
Yes
No
No
Yes
No
Instruction access to virtual address (VA)
VA is
in P4 area
VA is
in P2 area
VA is
in P1 area
VA is in P0, U0,
or P3 area
MMUCR.AT = 1
SH = 0
and (MMUCR.SV = 0 or
SR.MD = 0)
VPNs match
and V = 1
VPNs match,
ASIDs match, and
V = 1
Only one
entry matches
SR.MD?
Instruction TLB
multiple hit exception
0 (User)
1 (Privileged)
PR?
C = 1
and CCR.ICE = 1
Cache access
Memory access
(Non-cacheable)
Instruction TLB protection
violation exception
Instruction TLB
miss exception
Hardware ITLB
miss handling Search UTLB
Match?
Record in ITLB
Figure 7.10 Flowchart of Memory Access Using ITLB

Renesas SuperH SH-4A Specifications

General

Brand	Renesas
Model	SuperH SH-4A
Category	Computer Hardware
Language	English