NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 308 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
[11]
SBMS
Single/Block Mode Select
0 = Selects single mode. It requires an external GDMA request for every incurring GDMA
operation.
1 = Selects block mode. It requires a single external GDMA request during the atomic
GDMA operation. An atomic GDMA operation is defined as the sequence of GDMA
operations until the transfer count register reaches zero.
[10:8]
Reserved
Reserved.
[7]
SAFIX
Source Address Fixed
0 = Source address is changed during the GDMA operation.
1 = Do not change the destination address during the GDMA operation. This feature can
be used when data were transferred from a single source to multiple destinations.
[6]
DAFIX
Destination Address Fixed
0 = Destination address is changed during the GDMA operation.
1 = Do not change the destination address during the GDMA operation. This feature can
be used when data were transferred from multiple sources to a single destination.
[5]
DADIR
Source Address Direction
0 = Source address is incremented successively.
1 = Source address is decremented successively.
[4]
DADIR
Destination Address Direction
0 = Destination address is incremented successively.
1 = Destination address is decremented successively.
[3:2]
GDMAMS
GDMA Mode Select
00 = Software mode (memory-to-memory).
01 = Reserved.
10 = Reserved.
11 = Reserved.
[1]
BME
Burst Mode Enable
0 = Disables the 8-data burst mode.
1 = Enables the 8-data burst mode.
FF there are 8 words to be transferred, and BME [1]=1, the GDMA_TCNTx should be
0x01;.
However, if BME [1]=0, the GDMA_TCNTx should be 0x08.
[0]
GDMAEN
GDMA Enable
0 = Disables the GDMA operation.
1 = Enables the GDMA operation; this bit will be clear automatically when the transfer is
complete on AUTOIEN [19] register bit is on Disable mode.
Note:
when operate in Non-Descriptor mode, this bit determine the Memory-to Memory,
Memory-to-I/O and I/O-to-Memory operation or not.
When operate in Descriptor mode, this bit is determined in descriptor list.
Note:
Channel reset will clear this bit.
Descriptor fetches mode of Control Register: