SH7713 datasheet(234/904 Pages) RENESAS

234 / 904 page

Section 5 Memory Management Unit (MMU)

Rev.1.50 Aug. 30, 2006 Page 194 of 860

REJ09B0288-0150

VPN

Virtual Address (1-kbyte Page)

Virtual Address (4-kbyte Page)

TLB Entry

Offset

VPN

VPN (31-17) VPN (11-0) ASID V

PR SZ

PPN

C D

Offset

(15)

(2)

(8)

(1)

(19)

(1) (1) (1) (1)

Legend

VPN: Virtual page number

Upper 22 bits of virtual address for a 1-kbyte page, or upper 20 bits of virtual address for a 4-kbyte

page. Since VPN bits 16 to 12 are used as the index number, they are not stored in the TLB entry.

Attention must be paid to the synonym problem (see section 5.4.4, Avoiding Synonym Problems).

ASID: Address space identifier

Indicates the process that can access a virtual page. In single virtual memory mode and user mode, or

in multiple virtual memory mode, if the SH bit is 0, the address is compared with the ASID in PTEH

when address comparison is performed.

SH:

Share status bit

0: Page not shared between processes

1: Page shared between processes

SZ:

Page-size bit

0: 1-kbyte page

1: 4-kbyte page

Valid bit

Indicates whether 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 physical address. PPN bits 11 to10 are not used in case of a 4-kbyte page.

PR:

Protection key field

2-bit field encoded to define the access rights to the page.

00: Reading only is possible in privileged mode.

01: Reading/writing is possible in privileged mode.

10: Reading only is possible in privileged/user mode.

11: Reading/writing is possible in privileged/user mode.

Cacheable bit

Indicates whether the page is cacheable.

0: Non-cacheable

1: Cacheable

Dirty bit

Indicates whether the page has been written to.

0: Not written to

Figure 5.7 Virtual Address and TLB Structure

SH7713 Datasheet(PDF) 234 Page - Renesas Technology Corp

SH7713 Datasheet(HTML) 234 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL