NXP Semiconductors MWCT101 S Series, Reference Manual

Page: 306 / 1761

16.4.5.2.4 Fields
Field Function
31
ACTIVE
DMA Active Status
0b - eDMA is idle.
1b - eDMA is executing a channel.
30-24
—
eDMA version number
Reserved
23-18
—
Reserved
17
CX
Cancel Transfer
0b - Normal operation
1b - Cancel the remaining data transfer. Stop the executing channel and force the minor loop to
finish. The cancel takes effect after the last write of the current read/write sequence. The CX bit
clears itself after the cancel has been honored. This cancel retires the channel normally as if the
minor loop was completed.
16
ECX
Error Cancel Transfer
0b - Normal operation
1b - Cancel the remaining data transfer in the same fashion as the CX bit. Stop the executing
channel and force the minor loop to finish. The cancel takes effect after the last write of the current
read/write sequence. The ECX bit clears itself after the cancel is honored. In addition to cancelling
the transfer, ECX treats the cancel as an error condition, thus updating the Error Status register
(DMAx_ES) and generating an optional error interrupt.
15-8
—
Reserved
7
EMLM
Enable Minor Loop Mapping
0b - Disabled. TCDn.word2 is defined as a 32-bit NBYTES field.
1b - Enabled. TCDn.word2 is redefined to include individual enable fields, an offset field, and the
NBYTES field. The individual enable fields allow the minor loop offset to be applied to the source
address, the destination address, or both. The NBYTES field is reduced when either offset is
enabled.
6
CLM
Continuous Link Mode
NOTE: Do not use continuous link mode with a channel linking to itself if there is only one minor loop
iteration per service request, for example, if the channel's NBYTES value is the same as either
the source or destination size. The same data transfer profile can be achieved by simply
increasing the NBYTES value, which provides more efficient, faster processing.
0b - A minor loop channel link made to itself goes through channel arbitration before being
activated again.
1b - A minor loop channel link made to itself does not go through channel arbitration before being
activated again. Upon minor loop completion, the channel activates again if that channel has a
minor loop channel link enabled and the link channel is itself. This effectively applies the minor loop
offsets and restarts the next minor loop.
5
HALT
Halt DMA Operations
0b - Normal operation
1b - Stall the start of any new channels. Executing channels are allowed to complete. Channel
execution resumes when this bit is cleared.
4
HOE
Halt On Error
0b - Normal operation
1b - Any error causes the HALT bit to set. Subsequently, all service requests are ignored until the
HALT bit is cleared.
Table continues on the next page...
Memory map/register definition
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
306 NXP Semiconductors