7.0 Packet Reception
(Continued)
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
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.
Termination of Receive PacketÐPacket Reject
TL/F/11157 – 15
20
Obsolete