91C94 Datasheet, PDF (71/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

TX INTR
Save Pkt Number Regist er
R ead TXDONE Pkt # f rom
FI FO Ports Reg.
Writ eI nto Packet Number
Regist er
Write Addr es s Pointer Regist er
Read Status Word from RAM
Yes
TX Stat us
No
OK?
U pdat e St at istics
Re-Enable TXE NA
Immediately Issue "Release"
Co mm a nd
Update Variables
Acknowledge TXINTR
Read TX INT Again
No
TX INT = 0?
Yes
R est or e Packet Number
Return to ISR
FIGURE 14 – TX INTR
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