Information
DMA_TCDn_CITER_ELINKYES field descriptions (continued)
Field Description
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.
NOTE: When the CITER field is initially loaded by software, it must be set to the same value as that
contained in the BITER field.
NOTE: If the channel is configured to execute a single service request, the initial values of BITER and
CITER should be 0x0001.
21.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel
Linking Disabled) (DMA_TCD_CITER_ELINKNO)
If TCDn_CITER[ELINK] is cleared, the TCDn_CITER register is defined as follows.
Addresses: TCD0_CITER_ELINKNO is 4000_8000h base + 1016h offset = 4000_9016h
TCD1_CITER_ELINKNO is 4000_8000h base + 1036h offset = 4000_9036h
TCD2_CITER_ELINKNO is 4000_8000h base + 1056h offset = 4000_9056h
TCD3_CITER_ELINKNO is 4000_8000h base + 1076h offset = 4000_9076h
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Read
ELINK
CITER
Write
Reset
x* x* x* x* x* x* x* x* x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset.•
DMA_TCDn_CITER_ELINKNO 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
Table continues on the next page...
Memory map/register definition
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
368 Freescale Semiconductor, Inc.