MPC8280 datasheet(647/1386 Pages) FREESCALE

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MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

19-1

Chapter 19

SDMA Channels and IDMA Emulation

The MPC8280 has two physical serial DMA (SDMA) channels. The CP implements two dedicated virtual

SDMA channels for each FCC, MCC, SCC, SMC, SPI, and I2C—one for each transmitter and receiver.

An additional four virtual SDMA channels are assigned to the programmable independent DMA (IDMA)

channels.

Figure 19-1 shows data flow paths. Data from the peripheral controllers can be routed to external RAM

using the 60x bus (path 1) or the local bus (path 2).

Figure 19-1. SDMA Data Paths

On a path 1 access, the SDMA channel must acquire the external system bus. On a path 2 access, the local

bus is acquired and the access is not seen on the external system bus. Thus, the local bus transfer occurs at

the same time as other operations on the external 60x system bus.

External

RAM

External

ROM

Internal 60x Bus

Core

SDMA

Dual-Port

RAM

3 FCCs

External

RAM

60x

Local

2 MCCs

4 SCCs

SPI

2 SMCs

I2C

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