MAC7200 datasheet(272/976 Pages) FREESCALE

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Overview of the MAC7200 Implementation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

194

Freescale Semiconductor

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Supervisor Mode

•Data

•

Non-Cacheable

•

Bufferable/Non-Bufferable is software programmable in the DMA

12.1.2

eDMA Implementation

The eDMA has been developed to enable it to be instantiated over a range of devices with different feature

requirements. This allows the module to be reused both within families of devices and across wide product

ranges. The implementation of the DMA controller on the MAC7200 family has been targeted towards

cost sensitive applications while still maintaining a high level of functionality.

The MAC7200 family of devices has 16 independently programmable DMA channels available for use on

the MCU. The eDMA enables the definition of transfers from memory to memory, peripherals to/from

memory, and from peripheral to peripheral. The following shows all possible DMA transfer sources.

As there are greater than 16 possible sources for the DMA controller, a channel mux is used to enable the

user to define which of the sources are used, and on which channels they are assigned. Refer to Chapter 27,

“Enhanced Direct Memory Access (DMA Channel MUX)” for further details.

Table 12-1. DMA Channel Sources

Type

Source/Destination

DMA

Requests

Comments

Memory

System RAM

Transfer between on-chip memories

Program Flash

Shadow Block

Peripherals

ESCI_A, ESCI_B

Two requests per ESCI

(one for Tx, one for Rx)

DSPI_A, DSPI_B,

DSPI_C

Two requests per DSPI

(one for Tx, one for Rx)

I2C

Two requests

(one for Tx, one for Rx)

ATD_A

Two requests

(one for Command, one for Result)

eMIOS

One request available for each timer channel

External

External Bus

External (PIM)

Port A, B, C, D, E, F, G

Not all Ports are available on all devices.

Typically used with an “Always Enabled” source

Triggered

Any of the above

Sources/Destinations

Each request trigger can be assigned to a PIT

channel or may be left "always enabled"

(i.e.-continuous DMA requests)

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