SH7727 Datasheet, PDF (201/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 3 Memory Management Unit (MMU)
Measures to avoid the problem
The following two measures should be taken to avoid the problem described above:
a. After performing a reset and before setting AT to 1 in MMUCR, initialize to 1 the upper
four bits of the VPNs for each entry in the TLB address array.
b. When invalidating an entry in the TLB address array, initialize to 1 the upper four bits of
the corresponding VPN in addition to setting V to 0.
The above measures will ensure that the VPN is not in the area referenced after address
conversion. This will prevent condition (3) from being satisfied and prevent the problem
described above from arising.
Rev. 5.00 Dec 12, 2005 page 129 of 1034
REJ09B0254-0500