MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
9-23
9.3.1.16
Transfer Control Descriptor (TCD)
Each channel requires a 256-bit transfer control descriptor for defining the desired data movement
operation. The channel descriptors are stored in the local memory in sequential order: channel 0, channel
1,... channel 63 (MPC5554) or channel 0, channel 1,... channel 31 (MPC5553). The definitions of the TCD
are presented as twenty-three variable-length fields.
is field list of the basic TCD structure.
0
1
2
3
4
5
6
7
R ECP
0
GRPPRI
CHPRI
W
Reset
0
0
—
1
Reg Addr
Base + 0x100 + n
1
The reset value for the group and channel priority fields,
GRPPRI[0–1] and CHPRI[0–3], is equal to the
corresponding channel number for each priority register;
that is, EDMA_CPR31[GRPPRI] = 0b01 and
EDMA_CPR31[CHPRI] = 0b1111.
Figure 9-20. eDMA Channel n Priority Register (EDMA_CPRn)
Table 9-16. EDMA_CPRn Field Descriptions
Bits
Name
Description
0
ECP
Enable channel preemption.
0 Channel n cannot be suspended by a higher priority channel’s service request.
1 Channel n can be temporarily suspended by the service request of a higher priority
channel.
1
—
Reserved.
2–3
GRPPRI
[0:1]
Channel n current group priority. Group priority assigned to this channel group when
fixed-priority arbitration is enabled. These two bits are read only; writes are ignored. The
reset value for the group priority fields, is equal to the corresponding channel number for
each priority register; that is, EDMA_CPR31[GRPPRI] = 0b01.
4–7
CHPRI
[0:3]
Channel n arbitration priority. Channel priority when fixed-priority arbitration is enabled.
The reset value for the channel priority fields CHPRI[0–3], is equal to the corresponding
channel number for each priority register; that is, EDMA_CPR31[CHPRI] = 0b1111.
Table 9-17. TCDn 32-bit Memory Structure
eDMA Bit Offset
Lengt
h
TCDn Field Name
TCDn Abbreviation
(32 x n) + 0
32
Source Address
SADDR
(32 x n) + 32
5
Source address modulo
SMOD
(32 x n) + 37
3
Source data transfer size
SSIZE
(32 x n) + 40
5
Destination address modulo
DMOD
(32 x n) + 45
3
Destination data transfer size
DSIZE
(32 x n) + 48
16
Signed Source Address Offset
SOFF
Summary of Contents for MPC5553
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