DP83815CVNG National Semiconductor, DP83815CVNG Datasheet - Page 87

• Manufacturer Part Number: DP83815CVNG
• Description: IC CONTROLLER MEDIA ACCESS
• Manufacturer: National Semiconductor

Specifications of DP83815CVNG

• Controller Type: Ethernet Controller, MAC/BIU
• Interface: PCI
• Voltage - Supply: 3.3V
• Current - Supply: 170mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83815CVNG

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
87
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.
Actions
www.national.com