Figure 9-13. Transmit Descriptor Format And Data Fragments - Cirrus Logic EP93 Series User Manual

register sizes are in bits,
and shown in parentheses ().
TxDesQB (32)
E O F
( 1 )
E O F
( 1 )
number of bytes set in
TxDesQLen
E O F
( 1 )
E O F
( 1 )
DS785UM1
Transmit Descriptor Format
and Data Fragments
TxBufAdr 0 (32)
Buffer
Buffer Buffer
Cmd 0 (4)
Index 0 (15) Length 0 (12)
TxBufAdr 1 (32)
Buffer
Buffer Buffer
Cmd 1 (4)
Index 1 (15) Length 1 (12)
TxBufAdr 2 (32)
Buffer
Buffer Buffer
Cmd 2 (4)
Index 2 (15) Length 2 (12)
TxBufAdr n (32)
Buffer
Buffer Buffer
Cmd n (4)
Index n (15) Length n (12)

Figure 9-13. Transmit Descriptor Format and Data Fragments

Copyright 2007 Cirrus Logic
1/10/100 Mbps Ethernet LAN Controller
Data Fragment 0
Data Fragment 1
Each Data Fragment
Data Fragment 2
may begin on any byte
boundary, and may
end on any byte
boundary.
Data Fragment n
EP93xx User's Guide
Fragment 0
Length
in bytes
Fragment 1
Length
in bytes
Fragment 2
Length
in bytes
Fragment n
Length
in bytes
9-27
9