DP83816-MAAP National Semiconductor, DP83816-MAAP Datasheet - Page 85

• Manufacturer Part Number: DP83816-MAAP
• Description: BOARD EVALUATION DP83816
• Manufacturer: National Semiconductor

Specifications of DP83816-MAAP

• Main Purpose: Interface, Ethernet
• Utilized Ic / Part: DP83816
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

5.0 Buffer Management
rxDescRead
rxFIFOblock
rxDescWrite
rxFragWrite
rxDescRefr
rxAdvance
State
rxIdle
CR:RXE && !CRDD
XferDone && !OWN
CR:RXE && CRDD
XferDone && OWN
(descCnt == 0) &&
(rxPktBytes > 0)
rxPktBytes == 0
link == NULL
link!= NULL
FifoReady
XferDone
XferDone
XferDone
Event
(Continued)
Table 5-6 Receive State Tables
rxDescRead
rxFIFOblock
rxDescWrite
rxDescWrite
rxFIFOblock
rxDescRead
rxFragWrite
Next State
rxDescRefr
rxAdvance
rxAdvance
rxIdle
rxIdle
85
Start a burst transfer at address RXDP and a length
derived from RXCFG.
Start a burst transfer to refresh the link field of the current
descriptor.
Set ISR:RXIDLE.
Start a burst transfer from the RxDataFIFO to host
memory at fragPtr. The length will be the minimum of
rxPktBytes and descCnt. Decrement descCnt
accordingly.
Start a burst transfer to write the status back to the
descriptor, setting the OWN bit, and setting the MORE
bit. We'll continue the packet in the next descriptor.
Start a transfer to write the cmdsts back to the descriptor,
setting the OWN bit and clearing the MORE bit, and
filling in the final receive status (CRC, FAE, SIZE, etc.).
RXDP <- rxDescCache.link. Clear CRDD. Start a burst
transfer at address RXDP with a length derived from
RXCFG:MXDMA.
Set CRDD. Set ISR:RXIDLE.
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