NXP Semiconductors K22F series, Reference Manual, Page: 476 / 1407

22.3.31 TCD Current Minor Loop Link, Major Loop Count (Channel
Linking Enabled) (DMA_TCDn_CITER_ELINKYES)
If TCDn_CITER[ELINK] is set, the TCDn_CITER register is defined as follows.
Address: 4000_8000h base + 1016h (32d × i), where i=0d to 15d
Bit 15 14 13 12 11 10 9 8
Read
ELINK LINKCH CITER
Write 0
Reset x* x* x* x* x* x* x* x*
Bit
7 6 5 4 3 2 1 0
Read
CITER
Write
Reset x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset. •
DMA_TCDn_CITER_ELINKYES field descriptions
Field Description
15
ELINK
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 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
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
14–13
Reserved
This field is reserved.
12–9
LINKCH
Minor Loop 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 to the channel defined by this field by setting that channel’s
TCDn_CSR[START] bit.
CITER 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 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 Beginning Iteration Count (BITER) field.
Table continues on the next page...
Memory map/register definition
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
476 NXP Semiconductors