MB86967 Datasheet, PDF (83/129 Pages) Fujitsu Component Limited. – LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces

MB86967
“A” From
Flg. 12
RX PKT READ
Set RX CNT = 0
Mask interrupts
RBUF
EMPTY?
YES
NO
RC CNT =
RX MAX?
YES
NO
To Flg. 12
“B”
Read packet header from buffer
Set RPKT LEFT to length given in header
Increment RX CNT
Clear RX PKT
Read all or part of packet
Recalculate RPKT LEFT, subtracting byte count read
Process packet
=0
RPKT LEFT?
>0
Read more of
packet?
YES
NO
RPKT LEFT?
8bytes _{Read and discard}
balance of packet
> 8bytes
Write 04H to Skip Packet Register, BMPR14
Delay 260 ns minimum or poll BMPR14 utill it is 00H
Figure 14 Receive Packet Read Routine
83