K60P100M100SF2RM Datasheet, PDF (483/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Field
14–13
Reserved
12–9
LINKCH
8–0
BITER
Chapter 21 Direct Memory Access Controller (eDMA)
DMA_TCDn_BITER_ELINKYES field descriptions (continued)
Description
0 The channel-to-channel linking is disabled
1 The channel-to-channel linking is enabled
This read-only field is reserved and always has the value zero.
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 these four bits 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 is reloaded into the CITER field.
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.
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 is reloaded into the CITER field. If the channel is configured to execute a
single service request, the initial values of BITER and CITER should be 0x0001.
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel
Linking Disabled) (DMA_TCD_BITER_ELINKNO)
If the TCDn_BITER[ELINK] bit is cleared, the TCDn_BITER register is defined as
follows.
Addresses: 4000_8000h base + 101Eh offset + (32d × n), where n = 0d to 15d
Bit 15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
Write
BITER
Reset x* x* x* x* x* x* x* x* x* x* x* x* x* x* x* x*
* Notes:
• x = Undefined at reset.
Field
15
ELINK
DMA_TCDn_BITER_ELINKNO field descriptions
Description
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 is disabled, the BITER
Table continues on the next page...
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
483