Enhanced Direct Memory Access (eDMA)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor
499
n
structure, the slast field.
n
structure, the daddr field.
nbytes[0:19]
or
mloff[0:19]
Inner “minor” byte transfer count
or
Minor loop offset
If both smloe and dmloe are cleared, this field is part of the byte transfer count.
If either smloe or dmloe are set, this field represents a sign-extended offset applied to the
source or destination address to form the next-state value after the minor loop is completed.
nbytes[0:9]
Inner “minor” byte transfer count
Number of bytes to be transferred in each service request of the channel.
As a channel is activated, the contents of the appropriate TCD is loaded into the DMA engine,
and the appropriate reads and writes performed until the complete byte transfer count has
been transferred. This is an indivisible operation and cannot be stalled or halted. Once the
minor count is exhausted, the current values of the saddr and daddr are written back into the
local memory, the major iteration count is decremented and restored to the local memory. If
the major iteration count is completed, additional processing is performed.
This field is extended to 30 bits when both smloe and dmloe are cleared (disabled).
Address: DMA_ (32 × n) + 0x0C
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
slast[0:15]
W
Reset
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
slast[16:31]
W
Reset
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Figure 15-29. TCDn Word 3 (TCDn.slast) field
Table 15-24. TCDn Word 3 (TCDn.slast) field descriptions
Name
Description
slast[0:31]
Last source address adjustment
Adjustment value added to the source address at the completion of the outer major iteration
count.
This value can be applied to “restore” the source address to the initial value, or adjust the
address to reference the next data structure.
Table 15-23. TCDn Word 2 (TCDn.nbytes) field descriptions (continued)
Name
Description
Содержание MPC5602S
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