NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 309 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
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 DADIR 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.
[20:18]
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
[11]
Reserved
Reserved.
[10]
D_INTS
Descriptor Fetch Mode Interrupt Select
0 = The interrupt will take place at every end of descriptor fetch transfer.
1 = The interrupt only take place at the last descriptor fetch transfer.
NOTE:
this bit is only available in descriptor mode and lists intention.
[9:8]
Reserved
Reserved.
[7]
SAFIX
Source Address Fixed
0 = Source address is changed during the GDMA operation.
1 = Do not change the source address during the GDMA operation. This feature can be
used when data were transferred from a single source to multiple destinations.