Datasheet

DMA CONTROLLER MODULE
MOTOROLA MCF5206e USER’S MANUAL 7-11
Bit 7—Reserved
CE—Configuration Error
A configuration error results when either the number of bytes represented by the BCR is
not consistent with the requested source or destination transfer size, or the SAR or DAR
contains an address that does not match the requested transfer size for the source or des-
tination, respectively. The bit is cleared during a hardware reset, or by writing a logic one
to the DONE bit of the DSR.
1 = A configuration error has occurred.
0 = No configuration error exists.
BES—Bus Error on Source
1 = The DMA channel has terminated with a bus error either during the read portion of
a transfer or during an access in single address mode (SAA = 1).
0 = No bus error has occurred.
BED—Bus Error on Destination
1 = The DMA channel has terminated with a bus error during the write portion of a trans-
fer.
0 = No bus error has occurred.
Bit 3 —Reserved
REQ—Request
1 = The DMA channel has transfers remaining and the channel is not selected
0 = There is no request pending or the channel is currently active. The bit is cleared
when the channel is selected.
BSY—Busy
1 = This bit is set the first time the channel is enabled after a transfer is initiated.
0 = DMA channel is not active. This bit is cleared to 0 when the DMA has finished the
last transaction.
DONE—Transaction Done
This bit may be read or written and is set when all DMA Controller Module transactions
have completed normally, as determined by the transfer count or error conditions. When
the BCR reaches zero, DONE is asserted by the DMA or a peripheral device at the suc-
cessful conclusion of the final DMA Controller Module transfer.
This bit is written with a 1 to reset the DMA control/state bits and can be used in an inter-
rupt handler to clear the DMA interrupt and the DONE and error bits. It can also be used
to kill a transfer in progress by resetting state bits. Writing a 0 to this location has no affect.
1= DMA transfer is complete.
0= Writing or reading a 0 at this bit location has no affect.
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eescale S
emiconduct
or
, I
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