DMA_TCDn_CSR field descriptions (continued)
Field Description
0
START
Channel Start
If this flag is set, the channel is requesting service. The eDMA hardware automatically clears this flag after
the channel begins execution.
0 The channel is not explicitly started.
1 The channel is explicitly started via a software initiated service request.
22.3.35 TCD Beginning Minor Loop Link, Major Loop Count (Channel
Linking Enabled) (DMA_TCDn_BITER_ELINKYES)
If the TCDn_BITER[ELINK] bit is set, the TCDn_BITER register is defined as follows.
Address:
4000_8000h base + 101Eh offset + (32d × i), where i=0d to 15d
Bit 15 14 13 12 11 10 9 8
Read
ELINK LINKCH BITER
Write 0
Reset
x* x* x* x* x* x* x* x*
Bit
7 6 5 4 3 2 1 0
Read
BITER
Write
Reset
x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset.•
DMA_TCDn_BITER_ELINKYES field descriptions
Field Description
15
ELINK
Enables channel-to-channel linking on minor loop complete
As the channel completes the minor loop, this flag enables the linking to another channel, defined by
BITER[LINKCH]. 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 disables, the BITER value
extends 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 linking.
NOTE:
When the software loads the TCD, this field must be set equal to the corresponding CITER field;
otherwise, a configuration error is reported. As the major iteration count is exhausted, the
contents of this field are reloaded into the CITER field.
0 The channel-to-channel linking is disabled
1 The channel-to-channel linking is enabled
14–13
Reserved
This field is reserved.
12–9
LINKCH
Link Channel Number
Table continues on the next page...
Chapter 22 Enhanced Direct Memory Access (eDMA)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 481
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