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Chapter 16 Enhanced Direct Memory Access (eDMA)
MPC5606BK Microcontroller Reference Manual, Rev. 2
254
Freescale Semiconductor
memory containing the transfer control descriptors (TCD) for the channels. This implementation
minimizes the overall block size.
is a block diagram of the eDMA module.
Figure 16-1. eDMA block diagram
16.2.1
Features
The eDMA module supports the following features:
•
All data movement via dual-address transfers: read from source, write to destination
— Programmable source, destination addresses, transfer size, plus support for enhanced
addressing modes
•
Transfer control descriptor organized to support two-deep, nested transfer operations
— An
inner
data transfer loop defined by a minor byte transfer count
— An
outer
data transfer loop defined by a major iteration count
•
Channel service request via one of three methods:
Sl
ave
in
te
rf
ace
eDMA
eDMA Done
System b
u
s
Data path
Control
Address
Program model/
Slave write data
Slave write address
Bus write data
Slave read data
Bus address
eDMA engine
TCD0
TCD
n
– 1
eDMA Peripheral
Bus read data
channel arbitration
Request
path
SRAM
transfer control descriptor
(
TCD
)
SRAM
n
= 16 channels
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