LAN9500 Datasheet, PDF (68/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
FIGURE 5-16:
TX EXAMPLE ILLUSTRATING A PRE-PENDED TX CHECKSUM PREAMBLE
NOTE: The TX Checksum Preamble is
pre-pended to data to be transmitted.
FS is set in TX Command 'A' and CK is
set in TX Command 'B'. No start offset
may be added. FS must not be set for
subsequent fragments of the same
packet.
Data Written to the
LAN950x
TX Command 'A'
TX Command 'B'
TX Checksum Preamble
TX Command 'A'
TX Command 'B'
Payload Fragment 1
Pad DWORD 1
TX Command 'A'
TX Command 'B'
Payload Fragment 2
10-Byte
EnTdX OCfofmsemt Panaddd'Ain'g
TX Command 'B'
Payload Fragment 3
DS00001875A-page 68
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