MAC7200 datasheet(273/976 Pages) FREESCALE

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Overview of the MAC7200 Implementation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

195

12.1.3

eDMA External Pins

There are no eDMA signals that drive or are driven from MCU pins.

12.1.4

eDMA Bus Aborts

The DMA2 supports bus aborts on the Peripheral Bus, enforcing the following memory map:

If any part of a read or write falls within an aborted region, the entire transfer is aborted. For example, a

32-bit read or write to address $000c would be aborted.

Supervisor Access: Unused

12.1.5

eDMA Differences from MAC71xx

•

The debug functionality of the DMA is now enabled

12.1.6

eDMA Application Usage

NOTE

The DMA Block Guide is generic, and refers to configurations of the DMA

with up to 64 channels. The DMA on the MAC72xx is 16 channels, and you

must therefore take this into consideration when writing code to access

DMA configuration registers and (particularly) TCDs. READs to

unmapped registers will return zeros, WRITEs will be ignored.

12.1.6.1

Enabling the DMA

It is not necessary to enable the DMA before it can be used. However, the DMA Channel Mux must be

configured before any DMA transfers can occur.

Table 12-2. eDMA Bus Abort Memory Map

Abort

Allowed

$0000-$0007

$0008-$000d

$000e-$000f

$0010-$0015

$0016-$001f

$0020-$0025

$0026-$0027

$0028-$002d

$002e-$002f

$0030-$00fc

$00fd-$010f

$0110-$0fff

$1000-$11ff

$1200-$3fff

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