NXP Semiconductors MPC5606S - Page 499

Enhanced Direct Memory Access (eDMA)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 497
Figure 15-27 and Table define word 2 of the TCDn structure, the nbytes field.
ssize[0:2] Source data transfer size
000 8-bit
001 16-bit
010 32-bit
011 64-bit
100 16-byte (32-bit AHB bus, WRAP4 burst)
100 Reserved (64-bit AHB bus, reserved)
101 32-byte (if supported by the platform)
110 Reserved
111 Reserved
The attempted specification of a 64-bit source size in a 32-bit AMBA AHB bus implementation
produces a configuration error. Likewise, the attempted specification of a 16-byte source size
in a 64-bit AMBA AHB bus implementation generates a configuration error. The attempted
specification of a 32-byte burst on platforms that do not support such a transfer type will result
in a configuration error.
dmod[0:4] Destination address modulo
See the smod[5:0] definition.
dsize[0:2] Destination data transfer size
See the ssize[2:0] definition.
soff[16:31] Source address signed offset
Sign-extended offset applied to the current source address to form the next-state value as
each source read is completed.
Address: DMA_Offset + 0x1000 + (32 × n) + 0x08 Access: User read/write
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
nbytes[0:15]
W
Reset — — — — — — — — — — — — — — — —
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
nbytes[16:31]
W
Reset — — — — — — — — — — — — — — — —
Figure 15-27. TCDn Word 2 (TCDn.nbytes) field (DMACR[EMLM] = 0)
Table 15-21. TCDn Word 1 (TCDn.{smod,ssize,dmod,dsize,soff}) field descriptions (continued)
Name Description