Rainbow Electronics AT91CAP9S250A - Manual (Page 326)

326
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
26.5.16 DMAC Channel x [x = 0..3] Control A Register
Name: DMAC_CTRLAx [x = 0..3]
Access: Read/Write
Reset Value: 0x00000000
• BTSIZE
Buffer Transfer Size. The transfer size relates to the number of transfers to be performed, that is, for writes it refers to the
number of source width transfers to perform when DMAC is flow controller. For Reads, BTSIZE refers to the number of
transfers completed on the Source Interface. When this field is set to 0, the DMAC module is automatically disabled when
the relevant channel is enabled.
• SCSIZE
Source Chunk Transfer Size.
• DCSIZE
Destination Chunk Transfer size.
31 30 29 28 27 26 25 24
DONE – DST_WIDTH – – SRC_WIDTH
23 22 21 20 19 18 17 16
– DCSIZE – SCSIZE
15 14 13 12 11 10 9 8
BTSIZE
7 6 5 4 3 2 1 0
BTSIZE
SCSIZE value Number of data transferred
000 1
001 4
010 8
011 16
100 32
101 64
110 128
111 256
DCSIZE Number of data transferred
000 1
001 4
010 8
011 16
100 32