dp83902a National Semiconductor Corporation, dp83902a Datasheet - Page 20

• Manufacturer Part Number: dp83902a
• Description: St-nictm Serial Network Interface Controller For Twisted Pair
• Manufacturer: National Semiconductor Corporation

7 0 Packet Reception
BUFFER RECOVERY FOR REJECTED PACKETS
If the packet is a runt packet or contains CRC or Frame
Alignment errors it is rejected The buffer management log-
ic resets the DMA back to the first buffer page used to store
the packet (pointed to by CURR) recovering all buffers that
had been used to store the rejected packet This operation
will not be performed if the ST-NIC is programmed to accept
either runt packets or packets with CRC or Frame Alignment
(Continued)
Termination of Receive Packet Packet Reject
20
errors The received CRC is always stored in buffer memory
after the last byte of received data for the packet
Error Recovery
If the packet is rejected as shown the DMA is restored by
the ST-NIC by reprogramming the DMA starting address
pointed to by the Current Page Register
TL F 11157 – 15