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

 938

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

Notes:

1. USR means that the register field is manually programmed by the user.

2. CONT means that address are contiguous.

3. REP means that the register field is updated with its previous value. If the transfer is the first one, then the user must manu-

ally program the value.

4. Channel stalled is true if the relevant BTC interrupt is not masked.

5. LLI means that the register field is updated with the content of the linked list item.

During automatic replay mode, the channel registers are reloaded with their initial values at the completion of each
buffer and the new values used for the new buffer. Depending on the row number in 

, some

or all of the DMAC_SADDRx, DMAC_DADDRx, DMAC_CTRLAx and DMAC_CTRLBx channel registers are
reloaded from their initial value at the start of a buffer transfer.

In this case, the address between successive buffers is selected to be a continuation from the end of the previous
buffer. Enabling the source or destination address to be contiguous between buffers is a function of
D M A C _ C T R L A x . S R C _ D S C R ,  D M A C _ C F G x . S R C _ R E P ,  D M A C _ C T R L A x . D S T _ D S C R  a n d
DMAC_CFGx.DST_REP registers.

Multiple Buffers Transfer Management Table

1) Single Buffer or Last 

buffer of a multiple buffer 

transfer

0

–

–

1

1

USR

USR

USR

USR

2) Multi Buffer transfer 

with contiguous DADDR

0

–

0

0

1

LLI

LLI

CONT

LLI

3) Multi Buffer transfer 

with contiguous SADDR

0

0

–

1

0

LLI

CONT

LLI

LLI

4) Multi Buffer transfer 

with LLI support

0

–

–

0

0

LLI

LLI

LLI

LLI

5) Multi Buffer transfer 

with DADDR reloaded

0

–

1

0

1

LLI

LLI

REP

LLI

6) Multi Buffer transfer 

with SADDR reloaded

0

1

–

1

0

LLI

REP

LLI

LLI

7) Multi Buffer transfer

with BTSIZE reloaded and 

contiguous DADDR

1

–

0

0

1

REP

LLI

CONT

LLI

8) Multi Buffer transfer 

with BTSIZE reloaded and 

contiguous SADDR

1

0

–

1

0

REP

CONT

LLI

LLI

9) Automatic mode 

channel is stalling

BTsize is reloaded

1

0

0

1

1

REP

CONT

CONT

REP

10) Automatic mode 

BTSIZE, SADDR and 

DADDR reloaded

1

1

1

1

1

REP

REP

REP

REP

11) Automatic mode 

BTSIZE, SADDR reloaded 

and DADDR contiguous

1

1

0

1

1

REP

REP

CONT

REP