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TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-16
V1.1, 2011-05
DMA, V3.03
Combined Software/Hardware-controlled Mode
shows how software- and hardware-controlled modes can be combined. In
the example, the first DMA transfer is triggered by software when setting
STREQ.SCHmn. Hardware requests are still disabled. After hardware requests have
been enabled by setting HTREQ.ECHmn, subsequent DMA transfers are triggered now
by hardware request coming from the CHmn_REQ line.
In the example, DMA channel mn operates in Single Mode (CHCRmn.CHMODE = 0). In
this mode, TRSR.HTREmn becomes reset by hardware when CHSRmn.TCOUNT = 0
at the end of the DMA transaction.
Figure 11-9 Transaction Start by Software, Continuation by Hardware
(m = 0-1)
11.2.4.4 Error Conditions
The bus error flag ERRSR.FPIER indicates an FPI Bus error (SPB) that occurred during
a source move (read or write) of a DMA module transaction. The bus error flag
ERRSR.LMBER indicates an LMB Bus error that occurred during a source move (read
or write) of a DMA module transaction.
The source error flags ERRSR.MEmSER indicates than an error occurred during source
move (read) of a DMA transaction of DMA Sub-Block m.
The destination error flags ERRSR.MEmDER indicates than an error occurred during
destination move (write) of a DMA transaction of DMA Sub-Block m
MCT06157
tc = initial transfer count
TR0
TRn-1
TRn
TR1
tc-1
tc
0
0
2
1
TRSR.CHmn
Writing
STREQ.SCHmn=1
Writing
HTREQ.ECHmn=1
TRSR.HTREmn
CHmn_REQ
DMA Transfer mn
CHSRmn.TCOUNT
INT
(triggered at the end of a
transaction with IRDV=0)
Содержание TC1784
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