91C100FDREVB Datasheet, PDF (41/68 Pages) SMSC Corporation – FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY

TX INTR
Save Pkt Number Register
Read TXDONE Pkt # from
FIFO Ports Reg.
Write Into Packet Number
Register
Write Address Pointer Register
Read Status Word from RAM
Yes
TX Status
No
OK?
Update Statistics
Re-Enable TXENA
Immediately Issue "Release"
Command
Update Variables
Acknowledge TXINTR
Read TX INT Again
No
TX INT = 0?
Yes
Restore Packet Number
Return to ISR
FIGURE 8 - TX INTR
SMSC DS – LAN91C100FD REV. B
Page 41
Rev. 05/31/2000