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DSP16410CG Datasheet(PDF) 94 Page - Agere Systems |
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DSP16410CG Datasheet(HTML) 94 Page - Agere Systems |
94 / 314 page 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—3〉 channels, the DMAU sets the corresponding ERR[3:0] field if: ! An SIU 〈0—1〉 requests DMAU service for a channel before the DMAU has accepted the previous request from that SIU 〈0—1〉 for that channel. ! An SIU 〈0—1〉 requests 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—1〉 requests 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—1〉 requests DMAU service for a channel, and that channel’s source/destination transfer is complete (SCNT 〈0—3〉/DCNT〈0—3〉 =LIM〈0—3〉), and that channel’s AUTOLOAD field (CTL 〈0—3〉[0]—Table 34 on page 74) is cleared. For the MMT 〈4—5〉 channels, 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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