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20.3.35 TCD Beginning Minor Loop Link, Major Loop Count (Channel
Linking Enabled) (DMAx_TCDn_BITER_ELINKYES)
If the TCDn_BITER[ELINK] bit is set, the TCDn_BITER register is defined as follows.
Address: 4000_8000h base + 101Eh (32d × i), where i=0d to 7d
Bit
15
14
13
12
11
10
9
8
Read
Write
Reset
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
* Notes:
x = Undefined at reset.
•
DMAx_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
14–12
Reserved
This field is reserved.
11–9
LINKCH
Link Channel Number
If channel-to-channel linking is enabled (ELINK = 1), then after the minor loop is exhausted, the eDMA
engine initiates a channel service request at the channel defined by this field by setting that channel’s
TCDn_CSR[START] bit.
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.
BITER
Starting major iteration count
As the transfer control descriptor is first loaded by software, this 9-bit (ELINK = 1) or 15-bit (ELINK = 0)
field must be equal to the value in the CITER field. As the major iteration count is exhausted, the contents
of this field are reloaded into the CITER field.
Table continues on the next page...
Chapter 20 Enhanced Direct Memory Access (eDMA)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
453
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