CL-PS7500FE View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CL-PS7500FE

System-on-a Chip for Internet Appliance

Cirrus Logic 

CL-PS7500FE

System-on-a-Chip for Internet Appliance

VIRTUAL ADDRESS

SECTION

TRANSLATION

FAULT

INVALID

SECTION

DOMAIN

FAULT

NO ACCESS (‘00’)

RESERVED (‘10’)

CHECK ADDRESS ALIGNMENT

MISALIGNED

ALIGNMENT

FAULT

GET LEVEL ONE DESCRIPTOR

SECTION

PAGE

GET PAGE

TABLE ENTRY

CHECK DOMAIN STATUS

SECTION

PAGE

INVALID

PAGE

TRANSLATION

FAULT

NO ACCESS (‘00’)

RESERVED (‘10’)

PAGE

DOMAIN

FAULT

SECTION

PERMISSION

FAULT

VIOLATION

CLIENT(‘01’)

CLIENT(‘01’)

MANAGER(‘11’)

CHECK ACCESS

PERMISSIONS

CHECK ACCESS

PERMISSIONS

VIOLATION

SUB-PAGE

PERMISSION

FAULT

PHYSICAL ADDRESS

Figure 6-10. Sequence for Checking Faults

6.10.1 Alignment Fault

When Alignment fault is enabled (bit 1 in Control register is set), the MMU generates an Alignment fault

on any data word access where the address is not word-aligned irrespective of whether the MMU is

enabled or not; in other words, if either of virtual address bits 1:0 are not ‘0’.

An Alignment fault is not generated on any instruction fetch or on any byte access. Note that if the access

generates an Alignment fault, the access sequence aborts without reference to further permission

checks.

June 1997

ADVANCE DATA BOOK v2.0

49

ARM PROCESSOR MMU

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