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Enhanced Direct Memory Access (eDMA)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
9-25
defines the fields of the basic TCD structure.
Table 9-18. TCD
n
32-bit Memory Structure
eDMA Bit Offset
Bit
Length
TCD
n
Field Name
TCD
n
Abbreviation
Word #
(32 x n) + 0
32
Source address
SADDR
Word 0
(32 x n) + 32
5
Source address modulo
SMOD
Word 1
(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
(32 x n) + 64
32
Inner minor byte count
NBYTES
Word 2
(32 x n) + 96
32
Last source address adjustment
SLAST
Word 3
(32 x n) + 128
32
Destination address
DADDR
Word 4
(32 x n) + 160
1
Channel-to-channel linking on minor loop complete
CITER.E_LINK
Word 5
(32 x n) + 161
6
Current major iteration count or
Link channel number
CITER or
CITER.LINKCH
(32 x n) + 167
9
Current major iteration count
CITER
(32 x n) + 176
16
Destination address offset (signed)
DOFF
(32 x n) + 192
32
Last destination address adjustment /
scatter gather address
DLAST_SGA
Word 6
(32 x n) + 224
1
Channel-to-channel Linking on Minor Loop Complete BITER.E_LINK
Word 7
(32 x n) + 225
6
Starting major iteration count or
link channel number
BITER or
BITER.LINKCH
(32 x n) + 231
9
Starting major iteration count
BITER
(32 x n) + 240
2
Bandwidth control
BWC
(32 x n) + 242
6
Link channel number
MAJOR.LINKCH
(32 x n) + 248
1
Channel done
DONE
(32 x n) + 249
1
Channel active
ACTIVE
(32 x n) + 250
1
Channel-to-channel linking on major loop complete
MAJOR.E_LINK
(32 x n) + 251
1
Enable scatter/gather processing
E_SG
(32 x n) + 252
1
Disable request
D_REQ
(32 x n) + 253
1
Channel interrupt enable when current major
iteration count is half complete
INT_HALF
(32 x n) + 254
1
Channel interrupt enable when current major
iteration count complete
INT_MAJ
(32 x n) + 255
1
Channel start
START
Содержание MPC5566
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