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DSP16410CG Datasheet(PDF) 94 Page - Agere Systems

Part # DSP16410CG
Description  DSP16410CG Digital Signal Processor
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Manufacturer  AGERE [Agere Systems]
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DSP16410CG Datasheet(HTML) 94 Page - Agere Systems

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Data Sheet
DSP16410CG Digital Signal Processor
May 2003
94
Agere Systems—Proprietary
Agere Systems Inc.
Use pursuant to Company instructions
4 Hardware Architecture (continued)
4.13 Direct Memory Access Unit
(DMAU) (continued)
4.13.8 Error Reporting and Recovery
Each of the ERR[5:0] fields of the DSTAT register
(Table 30 on page 69) reflects a DMAU protocol failure
that indicates a loss of data for the corresponding
channel. For the SWT
0—3channels, the DMAU sets
the corresponding ERR[3:0] field if:
!
An SIU
0—1requests DMAU service for a channel
before the DMAU has accepted the previous request
from that SIU
0—1for that channel.
!
An SIU
0—1requests DMAU service for a channel,
and that channel’s RESET[3:0] field
(DMCON1[3:0]—Table 32 on page 72) is set.
!
An SIU
0—1requests DMAU destination/source
service for a channel, and that channel’s
DRUN[3:0]/SRUN[3:0] field
(DMCON0[7:0]—Table 31 on page 71) is cleared.
!
An SIU
0—1requests DMAU service for a channel,
and that channel’s source/destination transfer is
complete (SCNT
0—3/DCNT0—3=LIM0—3),
and that channel’s AUTOLOAD field
(CTL
0—3[0]—Table 34 on page 74) is cleared.
For the MMT
4—5channels, the DMAU sets the cor-
responding ERR[5:4] field if:
!
The user software attempts to set the TRIGGER[5:4]
field by writing 1 to DMCON0[11:10] and the TRIG-
GER[5:4] field is already set.
!
The user software attempts to set the TRIGGER[5:4]
field by writing 1 to DMCON0[11:10] and the
RESET[5:4] field (DMCON1[5:4]) is set.
If servicing a DMAU channel interrupt, the user soft-
ware should poll DSTAT to determine whether an error
has occurred. If so, the user software must perform the
following steps:
1. Set the corresponding RESET[5:0] field
(DMCON1[5:0]) to terminate all channel activity.
2. Write a 1 to the corresponding ERR[5:0] field to clear
the field and the error condition.
3. Reinitialize the corresponding channel address and
count registers.
4. Clear the corresponding RESET[5:0] field to reallow
channel activity.
5. For an MMT channel, re-enable a channel transfer
by setting the appropriate TRIGGER[5:4] field
(DMCON0[11:10]).


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