Cirrus-logic EP93xx Manuel d'utilisateur Page 329

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DS785UM1 9-27
Copyright 2007 Cirrus Logic
1/10/100 Mbps Ethernet LAN Controller
EP93xx User’s Guide
9
9
Figure 9-13. Transmit Descriptor Format and Data Fragments
T
xDesQB (32)
register sizes are in bits,
and shown in parentheses ().
TxBufAdr 0 (32)
Buffer
Index 0 (15)
Buffer
Length 0 (12)
Data Fragment 0
Fragment
0
Length
in bytes
Transmit Descriptor Format
and Data Fragments
Data Fragment 1
Fragment
1
Length
in bytes
number of bytes set in
TxDesQLen
Data Fragment 2
Fragment
2
Length
in bytes
Data Fragment n
Fragmen
t n
Length
in bytes
Each Data Fragment
may begin on any byte
boundary, and may
end on any byte
boundary.
EOF
(1)
Buffer
Cmd 0 (4)
TxBufAdr 1 (32)
Buffer
Index 1 (15)
Buffer
Length 1 (12)
EOF
(1)
Buffer
Cmd 1 (4)
TxBufAdr 2 (32)
Buffer
Index 2 (15)
Buffer
Length 2 (12)
EOF
(1)
Buffer
Cmd 2 (4)
TxBufAdr n (32)
Buffer
Index n (15)
Buffer
Length n (12)
EOF
(1)
Buffer
Cmd n (4)
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