Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 720

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

 HSMCI_DMA

0xFFF80050 (0), 0xFFFD0050 (1)

 Read-write

  

 

 

This field indicates the number of discarded bytes when the DMA writes the first word of the transfer.

The CHKSIZE field indicates the number of data available when the DMA chunk transfer request is asserted.     

0 = DMA interface is disabled.

1 = DMA Interface is enabled.

Note:

To avoid unpredictable behavior, DMA hardware handshaking must be disabled when CPU transfers are performed.

0: BLKLEN bytes are moved from the Memory Card to the system memory, two DMA descriptors are used when the trans-
fer size is not a multiple of 4.

1: Ceiling(BLKLEN/4) * 4 bytes are moved from the Memory Card to the system memory, only one DMA descriptor is used.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

23

22

21

20

19

18

17

16

–

–

–

–

–

–

–

–

15

14

13

12

11

10

9

8

–

–

–

ROPT

–

–

–

DMAEN

7

6

5

4

3

2

1

0

–

–

CHKSIZE

–

–

OFFSET

00

1

01

4

10

8

11

16