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Enhanced Direct Memory Access (eDMA)
Table 190. DMA_TCDn_CITER_ELINKNO field descriptions
Field
Enable channel-to-channel linking on minor-loop complete
As the channel completes the minor loop, this flag enables linking to another channel, defined by
the LINKCH field. The link target channel initiates a channel service request via an internal
mechanism that sets the TCDn_CSR[START] bit of the specified channel.If channel linking is
16
disabled, the CITER value is extended to 15 bits in place of a link channel number. If the major
loop is exhausted, this link mechanism is suppressed in favor of the MAJORELINK channel
ELINK
linking.
Note: This bit must be equal to the BITER[ELINK] bit. Otherwise, a configuration error is reported.
0 The channel-to-channel linking is disabled
1 The channel-to-channel linking is enabled
Current major iteration count
This 9-bit (ELINK = 1) or 15-bit (ELINK = 0) count represents the current major loop count for the
channel. It is decremented each time the minor loop is completed and updated in the transfer
control descriptor memory. After the major iteration count is exhausted, the channel performs a
17–31
number of operations (for example, final source and destination address calculations), optionally
generating an interrupt to signal channel completion before reloading the CITER field from the
CITER
beginning iteration count (BITER) field.
Note: When the CITER field is initially loaded by software, it must be set to the same value as that
19.3.28
TCD Signed Destination Address Offset (DMA_TCDn_DOFF)
See TCD Signed Destination Address Offset register figure and DMA_TCDn_DOFF field
descriptions table as follows.
Address: FC0A_0000h base + 1016h offset + (32d × n), where n = 0d to 63d
0
1
R
W
(1)
Reset
x
x
Figure 146. TCD Signed Destination Address Offset (DMA_TCDn_DOFF)
1. x = Undefined at reset.
Field
Destination address signed offset
16–31
Sign-extended offset applied to the current destination address to form the next-state value as
DOFF
each destination write is completed.
424/2058
contained in the BITER field. If the channel is configured to execute a single service
request, the initial values of BITER and CITER should be 0x0001.
2
3
4
5
x
x
x
x
Table 191. DMA_TCDn_DOFF field descriptions
DocID027809 Rev 4
Description
6
7
8
9
DOFF
x
x
x
x
Description
Access: User read/write
10
11
12
13
x
x
x
x
RM0400
14
15
x
x
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