TX LENGTH/STATUS
BUFFER ADDRESS
CONTROL/BUF LENGTH
NEXT DESCR. ADDRESS
FRAME 1 STATUS
TX LENGTH/STATUS
BUFFER ADDRESS
CONTROL/BUF LENGTH
NEXT DESCR. ADDRESS
FRAME 2 STATUS
TX LENGTH/STATUS
BUFFER ADDRESS
CONTROL/BUF LENGTH
NEXT DESCR. ADDRESS
FRAGLIST = 1
NUMBER FRAGS
FRAG1 ADDRESS
FRAG1 LENGTH
FRAGn ADDRESS
FRAGn LENGTH
LFORM = 0
FRAME DATA
FRAME DATA
FRAME 1
FRAME DATA
FRAME DATA
FRAME 2
FIGURE 3 - TRANSMIT BUFFER STRUCTURE
The software may add transmit frames to the
queue at any time. If the transmit process is
already running (TXQUEUED may still be set)
then all of the descriptor and fragment list fields
for the new frame must be valid BEFORE the
ownership bit in the first descriptor is set. After
17