Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

469

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-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 

manually 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.
E n a b l i n g   t h e   s o u r c e   o r   d e s t i n a t i o n   a d d r e s s   t o   b e   c o n t i g u o u s   b e t w e e n   b u f f e r s   i s   a   f u n c t i o n   o f
DMAC_CTRLAx.SRC_DSCR, DMAC_CFGx.DST_REP, DMAC_CFGx.SRC_REP and DMAC_CTRLAx.DST_DSCR
registers.

1) Single Buffer or Last 

buffer of a multiple buffer 

transfer

0

–

–

–

–

USR

0

USR

USR

USR

2) Multi Buffer transfer with 

contiguous DADDR

0

–

0

0

1

LLI

USR

LLI

CONT

LLI

3) Multi Buffer transfer with 

contiguous SADDR

0

0

–

1

0

LLI

USR

CONT

LLI

LLI

4) Multi Buffer transfer with 

LLI support

0

–

–

0

0

LLI

USR

LLI

LLI

LLI

5) Multi Buffer transfer with 

DADDR reloaded

0

–

1

0

1

LLI

USR

LLI

REP

LLI

6) Multi Buffer transfer with 

SADDR reloaded

0

1

–

1

0

LLI

USR

REP

LLI

LLI

7) Multi Buffer transfer

with BTSIZE reloaded and 

contiguous DADDR

1

–

0

0

1

REP

USR

LLI

CONT

LLI

8) Multi Buffer transfer with 

BTSIZE reloaded and 

contiguous SADDR

1

0

–

1

0

REP

USR

CONT

LLI

LLI

9) Automatic mode channel 

is stalling

BTsize is reloaded

1

0

0

1

1

REP

USR

CONT

CONT

REP

10) Automatic mode 

BTSIZE, SADDR and 

DADDR reloaded

1

1

1

1

1

REP

USR

REP

REP

REP

11) Automatic mode 

BTSIZE, SADDR reloaded 

and DADDR contiguous

1

1

0

1

1

REP

USR

REP

CONT

REP