SH7727 datasheet(175/1109 Pages) RENESAS

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Section 3 Memory Management Unit (MMU)

Rev. 5.00 Dec 12, 2005 page 103 of 1034

REJ09B0254-0500

3.1.4

Table 3.1 shows the configuration of the MMU control registers.

Table 3.1

Name

Abbreviation

R/W Size

Initial Value*

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

3.2

There are five registers for MMU processing. These are all peripheral module registers, so they are

located in address space area P4 and can only be accessed from privileged mode by specifying the

address. These registers consist of:

1. The page table entry register high (PTEH) register residing at address H'FFFFFFF0, which

consists of a virtual page number (VPN) and ASID. The VPN set is the VPN of the logical

address at which the exception is generated in case of an MMU exception or address error

exception. When the page size is 4 kbytes, the VPN is the upper 20 bits of the logical address,

but in this case the upper 22 bits of the logical address are set. The VPN can also be modified

by software. As the ASID, software sets the number of the currently executing process. The

VPN and ASID are recorded in the TLB by the LDTLB instruction.

2. The page table entry register low (PTEL) register residing at address H'FFFFFFF4, and used to

store the physical page number and page management information to be recorded in the TLB

by the LDTLB instruction. The contents of this register are only modified in response to a

software command.

3. The translation table base register (TTB) residing at address H'FFFFFFF8, which points to the

base address of the current page table. The software does not set any value in TTB

automatically. TTB is available to software for general purposes.

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