MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
9-33
This source read/destination write processing continues until the inner minor byte count has been
transferred. The eDMA Done Handshake signal is asserted at the end of the minor byte count transfer.
Figure 9-23. eDMA Operation, Part 2
After the inner minor byte count has been moved, the final phase of the basic data flow is performed. In
this segment, the address path logic performs the required updates to certain fields in the channel’s TCD:
for example., SADDR, DADDR, CITER. If the outer major iteration count is exhausted, then there are
additional operations which are performed. These include the final address adjustments and reloading of
the BITER field into the CITER. Additionally, assertion of an optional interrupt request occurs at this time,
as does a possible fetch of a new TCD from memory using the scatter/gather address pointer included in
Slav
e Interface
eDMA
eDMA Interrupt Request
System Bus
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
SRAM
Transfer Control Descriptor
(TCD)
SRAM
*
n
= 64 channels in MPC5554
32 channels in MPC5553
Data Path
Control
Address
Path
eDMA Done Handshake
Summary of Contents for MPC5553
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