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Chapter 16 Enhanced Direct Memory Access (eDMA)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
277
240–241 /
0x1C [16:17]
BWC
[0:1]
Bandwidth control. This 2-bit field provides a mechanism to effectively
throttle the amount of bus bandwidth consumed by the eDMA. In general,
as the eDMA processes the inner minor loop, it continuously generates
read/write sequences until the minor count is exhausted. This field forces
the eDMA to stall after the completion of each read/write access to control
the bus request bandwidth seen by the system bus crossbar switch
(XBAR).
00 No DMA engine stalls
01 Reserved
10 DMA engine stalls for 4 cycles after each r/w
11 DMA engine stalls for 8 cycles after each r/w
242–247 /
0x1C [18:23]
MAJOR.LINKCH
[0:5]
Link channel number.
If channel-to-channel linking on major loop complete is disabled
(TCD.MAJOR.E_LINK = 0) then,
• No channel-to-channel linking (or chaining) is performed after the outer
major loop counter is exhausted.
Otherwise
• After the major loop counter is exhausted, the DMA engine initiates a
channel service request at the channel defined by MAJOR.LINKCH[0:5]
by setting that channel’s TCD.START bit.
248 /
0x1C [24]
DONE
Channel done. This flag indicates the eDMA has completed the outer major
loop. It is set by the DMA engine as the CITER count reaches zero; it is
cleared by software or hardware when the channel is activated (when the
DMA engine has begun processing the channel, not when the first data
transfer occurs).
Note:
This bit must be cleared to write the MAJOR.E_LINK or E_SG bits.
249 /
0x1C [25]
ACTIVE
Channel active. This flag signals the channel is currently in execution. It is
set when channel service begins, and is cleared by the DMA engine as the
inner minor loop completes or if any error condition is detected.
250 /
0x1C [26]
MAJOR.E_LINK
Enable channel-to-channel linking on major loop completion. As the
channel completes the outer major loop, this flag enables the linking to
another channel, defined by MAJOR.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.
NOTE: To support the dynamic linking coherency model, this field is forced
to zero when written to while the TCD.DONE bit is set.
0 The channel-to-channel linking is disabled.
1 The channel-to-channel linking is enabled.
Table 16-19. TCD
n
field descriptions (continued)
Bits /
Word Offset
[n:n]
Name
Description
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