CS4210 datasheet(59/102 Pages) NSC

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4.4.3

ATRetries Register

The ATRetries register (Table 4-11) holds the number of

times the CS4210 attempts to do a retry for asynchronous

DMA request transmit and for asynchronous physical and

DMA response transmit. A packet may only be retried when

a “busy” acknowledge or ack_data_error is received from

the target node, including ack_data_error’s resulting from

FIFO underflows. A packet is not retried under any other

circumstance, including receipt of evt_missing_ack.

Table 4-11. BAR0+Offset 08h: ATRetries Register

Bit

Name

Access

Reset

Description

31:29

secondLimit

Second Limit: Not implemented.

28:16

cycleLimit

Cycle Limit: Not implemented.

15:11

maxPhysRespRe-

tries

Undef

Maximum Physical Response Retries: This field tells the response unit

within the RDMA module how many times to attempt to retry the transmit

operation for the response packet. Note that this value is used only for

responses to physical requests.

If the retry count expires for a physical response, the packet is discarded by

the CS4210. Software is not notified.

10:8

RSVD

Reserved

7:4

maxATRespRetries

Undef

Maximum AT Physical Response Retries: This field tells the asynchro-

nous transmit response unit within the ATDMA module how many times to

attempt to retry the transmit operation for a software transmitted (non-phys-

ical) asynchronous response packet.

3:0

maxATReqRetries

Undef

Maximum AT Request Retries: This field tells the asynchronous transmit

request unit within the ATDMA how many times to attempt to retry the trans-

mit operation for an asynchronous request packet.

CS4210 Datasheet(PDF) 59 Page - National Semiconductor (TI)

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