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

entry, or Level Two descriptor, is returned. This in turn may define either a small page or large page

access. Figure 6-5 shows the format of Level Two descriptors.

31

20 19

16 15

12 11 10 9 8 7 6 5 4 3 2 1 0

0 0 FAULT

LARGE PAGE BASE ADDRESS

AP3 AP2 AP1 AP0 C B 0 1 LARGE PAGE

SMALL PAGE BASE ADDRESS

AP3 AP2 AP1 AP0 C B 1 0 SMALL PAGE

1 1 RESERVED

Figure 6-5. Page Table Entry (Level Two Descriptor)

The two least-significant bits indicate the page size and validity, and are interpreted as shown in Table 6-3.

Table 6-3. Interpreting Page Table Entry Bits 1:0

Value

00

01

10

11

Meaning

Invalid

Large Page

Small Page

Reserved

Notes

Generates a Page Translation fault.

Indicates that this is a 64-Kbyte page.

Indicates that this is a 4-Kbyte page.

Reserved for future use.

June 1997

ADVANCE DATA BOOK v2.0

43

ARM PROCESSOR MMU

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