Atmel SAM9X25, Manual

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522
11054A–ATARM–27-Jul-11
SAM9X25
522
11054A–ATARM–27-Jul-11
SAM9X25
• SOD
0 (DISABLE): STOP ON DONE disabled, the descriptor fetch operation ignores DONE Field of CTRLA register.
1 (ENABLE): STOP ON DONE activated, the DMAC module is automatically disabled if DONE FIELD is set to 1.
• LOCK_IF
0 (DISABLE): Interface Lock capability is disabled
1 (ENABLE): Interface Lock capability is enabled
• LOCK_B
0 (DISABLE): AHB Bus Locking capability is disabled.
1(ENABLE): AHB Bus Locking capability is enabled.
• LOCK_IF_L
0 (CHUNK): The Master Interface Arbiter is locked by the channel x for a chunk transfer.
1 (BUFFER): The Master Interface Arbiter is locked by the channel x for a buffer transfer.
• AHB_PROT
AHB_PROT field provides additional information about a bus access and is primarily used to implement some level of
protection.
• FIFOCFG
HPROT[3] HPROT[2] HPROT[1] HPROT[0] Description
1 Data access
AHB_PROT[0]
0: User Access
1: Privileged Access
AHB_PROT[1]
0: Not Bufferable
1: Bufferable
AHB_PROT[2]
0: Not cacheable
1: Cacheable
Value Name Description
00 ALAP_CFG The largest defined length AHB burst is performed on the destination AHB interface.
01 HALF_CFG When half FIFO size is available/filled, a source/destination request is serviced.
10 ASAP_CFG
When there is enough space/data available to perform a single AHB access, then the
request is serviced.