SH7708 datasheet(75/633 Pages) RENESAS

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Address Space Identifier (ASID): When multiple processes run in parallel sharing the same

virtual address space and the processes have unique address translation tables, the virtual space

can be multiplexed. The ASID is 8 bits in length and is held in PTEH within the MMU indicating

the current process. With ASID, the TLB need not be purged when the process is switched.

When multiple processes run in parallel using the virtual address space exclusively, the physical

address corresponding to a given virtual address is specified uniquely. For this kind of single

virtual memory, the ASID becomes a key to protect memory (see section 3.4.2).

3.1.4

A register that has an undefined initial value must be initialized by the software. Table 3.1 shows

the configuration of the MMU control registers.

Table 3.1

Name

Abbreviation

R/W

Size

Initial Value*1 Address

Page table entry register

high

PTEH

R/W

Longword

Undefined

H'FFFFFFF0

Page table entry register low

PTEL

R/W

Longword

Undefined

H'FFFFFFF4

Translation table base

TTB

R/W

Longword

Undefined

H'FFFFFFF8

TLB exception address

TEA

R/W

Longword

Undefined

H'FFFFFFFC

MMU control register

MMUCR

R/W

Longword

H'FFFFFFE0

Notes: 1. Initialized by a power-on reset or manual reset.

2. SV bit: undefined

Other bits: 0

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