NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 307 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
Control Register of Non-Descriptor fetches Mode:
Bits
Description
[31:23]
Reserved
Reserved.
[22]
SABNDERR
Source Address Boundary Alignment Error Flag
If TWS [13:12]=10, GDMA_SRCB [1:0] should be 00.
If TWS [13:12]=01, GDMA_SRCB [0] should be 0.
Except the SADIR function enabled.
The address boundary alignment should be depended on TWS [13:12].
0 = the GDMA_SRCB is on the boundary alignment.
1 = the GDMA_SRCB not on the boundary alignment.
The SABNDERR register bits just can be read only.
[21]
DABNDERR
Destination Address Boundary Alignment Error Flag
If TWS [13:12]=10, GDMA_DSTB [1:0] should be 00.
If TWS [13:12]=01, GDMA_DSTB [0] should be 0.
Except the SADIR function enabled.
The address boundary alignment should be depended on TWS [13:12].
0 = the GDMA_DSTB is on the boundary alignment.
1 = the GDMA_DSTB not on the boundary alignment.
The DABNDERR register bits just can be read only.
[20]
Reserved
Reserved.
[19]
AUTOIEN
Auto Initialization Enable
0 = Disables auto initialization.
1 = Enables auto initialization, the GDMA_CSRC0/1,GDMA_CDST0/1,and
GDMA_CTCNT0/1 registers are updated by the GDMA_SRC0/1, GDMA_DST0/1, and
GDMA_TCNT0/1 registers automatically when transfer is complete.
GDMA will start another transfer when SOFTREQ set again.
[18]
Reserved
Reserved.
[17]
BLOCK
Bus Lock
0 = Unlocks the bus during the period of transfer.
1 = locks the bus during the period of transfer.
[16]
SOFTREQ
Software Triggered GDMA Request
Software can request the GDMA transfer service by setting this bit to 1. This bit is
automatically cleared by hardware when the transfer is completed. This bit is available
only while GDMAMS [3:2] register bits are set on software mode (memory to memory and
memory to I/O).
[15:14]
Reserved
Reserved.
[13:12]
TWS
Transfer Width Select
00 = One byte (8 bits) is transferred for every GDMA operation.
01 = One half-word (16 bits) is transferred for every GDMA operation.
10 = One word (32 bits) is transferred for every GDMA operation.
11 = Reserved.
The GDMA_SCRB and GDMA_DSTB should be alignment under the TWS selection