NXP Semiconductors MWCT101 S Series, Reference Manual

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16.4.5.20.3 Fields
Field Function
15-0
SOFF
Source address signed offset
Sign-extended offset applied to the current source address to form the next-state value as each source
read is completed.
16.4.5.21 TCD Transfer Attributes (TCD0_ATTR - TCD15_ATTR)
16.4.5.21.1 Offset
For n = 0 to 15:
Register Offset
TCDn_ATTR 1006h + (n × 20h)
16.4.5.21.2 Diagram
Bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
SMOD SSIZE DMOD DSIZE
W
Reset
u u u u u u u u u u u u u u u u
16.4.5.21.3 Fields
Field Function
15-11
SMOD
Source Address Modulo
00000b - Source address modulo feature is disabled
00001-11111b - This value defines a specific address range specified to be the value after SADDR
+ SOFF calculation is performed on the original register value. Setting this field provides the ability
to implement a circular data queue easily. For data queues requiring power-of-2 size bytes, the
queue should start at a 0-modulo-size address and the SMOD field should be set to the appropriate
value for the queue, freezing the desired number of upper address bits. The value programmed into
this field specifies the number of lower address bits allowed to change. For a circular queue
application, the SOFF is typically set to the transfer size to implement post-increment addressing
with the SMOD function constraining the addresses to a 0-modulo-size range.
10-8
SSIZE
Source data transfer size
NOTE: Using a Reserved value causes a configuration error.
Table continues on the next page...
Chapter 16 Enhanced Direct Memory Access (eDMA)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors 335