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MPC8280 Datasheet(PDF) 647 Page - Freescale Semiconductor, Inc

Part # MPC8280
Description  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 647 Page - Freescale Semiconductor, Inc

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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
CP
SDMA
Dual-Port
RAM
1
3 FCCs
External
RAM
2
60x
Local
2 MCCs
4 SCCs
SPI
2 SMCs
I2C



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