Freescale Semiconductor MCF52277 Reference Manual page 283

Field
15–0 Source address signed offset. Sign-extended offset applied to the current source address to form the
SOFF next-state value as each source read is completed.
Address: 0xFC04_5008 + (0x20 × n) (TCDn_NBYTES)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
R
W
Reset – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Field
31–0 Minor byte transfer count. Number of bytes to be transferred in each service request of the channel. As a
NBYTES channel activates, the appropriate TCD contents load into the eDMA engine, and the appropriate reads and
writes perform until the minor byte transfer count has transferred. This is an indivisible operation and cannot
be halted. (Although, it may be stalled by using the bandwidth control field, or via preemption.) After the
minor count is exhausted, the SADDR and DADDR values are written back into the TCD memory, the major
iteration count is decremented and restored to the TCD memory. If the major iteration count is completed,
additional processing is performed.
Note: An NBYTES value of 0x0000_0000 is interpreted as a 4 GB transfer.
Address: 0xFC04_500C + (0x20 × n) (TCDn_SLAST)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
R
W
Reset – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Figure 17-22. TCDn Source Last Address Adjustment (TCDn_SLAST)
Field
31–0 Last source address adjustment. Adjustment value added to the source address at the completion of the
SLAST 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.
Address: 0xFC04_5010 + (0x20 × n) (TCDn_DADDR)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
R
W
Reset – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
Freescale Semiconductor
Table 17-22. TCDn_SOFF Field Descriptions
Figure 17-21. TCDn Minor Byte Count (TCDn_NBYTES)
Table 17-23. TCDn_NBYTES Field Descriptions
Table 17-24. TCDn_SLAST Field Descriptions
Figure 17-23. TCDn Destination Address (TCDn_DADDR)
MCF52277 Reference Manual, Rev. 1
Enhanced Direct Memory Access (eDMA)
Description
NBYTES
Description
SLAST
Description
DADDR
Access: User read/write
8 7 6 5 4 3 2 1 0
Access: User read/write
8 7 6 5 4 3 2 1 0
Access: User read/write
8 7 6 5 4 3 2 1 0
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