Hitachi SH7751 Hardware Manual page 106

SZ: Page size bits
Specify the page size.
00: 1-kbyte page
01: 4-kbyte page
10: 64-kbyte page
11: 1-Mbyte page


V: Validity bit
Indicates whether the entry is valid.
0: Invalid
1: Valid
Cleared to 0 by a power-on reset.
Not affected by a manual reset.


PPN: Physical page number
Upper 22 bits of the physical address.
With a 1-kbyte page, PPN bits [28:10] are valid.
With a 4-kbyte page, PPN bits [28:12] are valid.
With a 64-kbyte page, PPN bits [28:16] are valid.
With a 1-Mbyte page, PPN bits [28:20] are valid.
The synonym problem must be taken into account when setting the PPN (see section 3.5.5,
Avoiding Synonym Problems).


PR: Protection key data
2-bit data expressing the page access right as a code.
00: Can be read only, in privileged mode
01: Can be read and written in privileged mode
10: Can be read only, in privileged or user mode
11: Can be read and written in privileged mode or user mode


C: Cacheability bit
Indicates whether a page is cacheable.
0: Not cacheable
1: Cacheable
When control register space is mapped, this bit must be cleared to 0.
When performing PCMCIA space mapping in the cache enabled state, either clear this bit to 0
or set the WT bit to 1.
Rev. 3.0, 04/02, page 67 of 1064