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Chapter 16 Enhanced Direct Memory Access (eDMA)
MPC5606BK Microcontroller Reference Manual, Rev. 2
276
Freescale Semiconductor
192–223 /
0x18 [0:31]
DLAST_SGA
[0:31]
Last destination address adjustment or the memory address for the next
transfer control descriptor to be loaded into this channel (scatter-gather).
If scatter-gather processing for the channel is disabled (TCD.E_SG = 0)
then
• Adjustment value added to the destination address at the completion of
the outer major iteration count.
This value can be applied to restore the destination address to the initial
value, or adjust the address to reference the next data structure.
Otherwise,
• This address points to the beginning of a 0-modulo-32 byte region
containing the next transfer control descriptor to be loaded into this
channel. This channel reload is performed as the major iteration count
completes. The scatter-gather address must be 0-modulo-32 byte,
otherwise a configuration error is reported.
224 /
0x1C [0]
BITER.E_LINK
Enables channel-to-channel linking on minor loop complete. As the channel
completes the inner minor loop, this flag enables the linking to another
channel, defined by BITER.LINKCH[0:5]. The link target channel initiates a
channel service request via an internal mechanism that sets the
TCD.START bit of the specified channel. If channel linking is disabled, the
BITER 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
MAJOR.E_LINK channel linking.
0 The channel-to-channel linking is disabled.
1 The channel-to-channel linking is enabled.
Note:
When the TCD is first loaded by software, this field must be set equal
to the corresponding CITER field, otherwise a configuration error will be
reported. As the major iteration count is exhausted, the contents of this field
is reloaded into the CITER field.
225–230 /
0x1C [1:6]
BITER
[0:5]
or
BITER.LINKCH[0:5]
Starting major iteration count or link channel number.
If channel-to-channel linking is disabled (TCD.BITER.E_LINK = 0), then
• No channel-to-channel linking (or chaining) is performed after the inner
minor loop is exhausted. TCD bits [225:239] are used to form a 15-bit
BITER field.
Otherwise,
• After the minor loop is exhausted, the DMA engine initiates a channel
service request at the channel, defined by BITER.LINKCH[0:5], by
setting that channel’s TCD.START bit.
Note:
When the TCD is first loaded by software, this field must be set equal
to the corresponding CITER field, otherwise a configuration error will be
reported. As the major iteration count is exhausted, the contents of this field
is reloaded into the CITER field.
231–239 /
0x1C [7:15]
BITER
[6:14]
Starting major iteration count. As the transfer control descriptor is first
loaded by software, this 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:
If the channel is configured to execute a single service request, the
initial values of BITER and CITER should be 0x0001.
Table 16-19. TCD
n
field descriptions (continued)
Bits /
Word Offset
[n:n]
Name
Description
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