MAC7200 datasheet(233/976 Pages) FREESCALE

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A7S Nexus3 Programmers Model

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

155

11.10.3.6 Read/Write Access Data (RWD)

The Read/Write Access Data Register provides the data to/from AHB memory mapped locations when

initiating a read or a write access.

Table 11-25. RWCS Field Descriptions

Field

Description

Access Control

0 End access

1 Start access

Read/Write Select

0 Read access

1 Write access

29–27

Word Size

000 8-bit (byte)

001 16-bit (halfword)

010 32-bit (word)

011–111Reserved (default to word)

26–24

MAP

Map Select

000 Primary memory map

001–111Reserved

23–22

Read/Write Access Priority

00 Lowest access priority

01 Reserved (default to lowest priority)

10 Reserved (default to lowest priority)

11 Highest access priority

21–16

Reserved for future functionality

15–2

CNT

Access Control Count

hhhh Number of accesses of word size SZ

ERR

Read/Write Access Error (see Table 11-26)

Read/Write Access Data Valid (see Table 11-26)

Table 11-26. Read/Write Access Status Bit Encoding

Read Action

Write Action

ERR

Read Access has not completed

Write Access completed without error

Read Access error has occurred

Write Access error has occurred

Read Access completed without error

Write Access has not completed

Not Allowed

Not allowed

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