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April, 2002
L84302 Quad 4-Port Ethernet Controller - Technical Manual
Copyright 1997-2002 by LSI Logic Corporation. All rights reserved.
The transmit MAC then sends the fully formed Ethernet packet to the
PHY Interface for transmission. The transmit MAC section also generates
MAC Control frames. The status of the last two packets transmitted is
available in the TX Status register.
3.4.2 Preamble & SFD Generation
The transmit MAC normally appends the preamble and SFD to the
packet. The device can be programmed to
not
append the preamble and
SFD to the transmit packet by setting the transmit preamble disable bit
in the Configuration 1 register.
3.4.3 AutoPad
AutoPadding is the process of automatically adding enough zeroes on
packets with data fields less than 46 bytes to make the data field exactly
46 bytes in length and meet the 46 byte minimum data field requirement
of IEEE 802.3. The device can be programmed to AutoPad by setting the
AutoPad enable bit in the Configuration 1 register.
3.4.4 CRC Generation
The transmit MAC computes the CRC value on the packet, and it
normally appends this CRC value to the end of the data packet from the
transmit FIFO. The device can be programmed to not append the CRC
value to the end of the packet by asserting the TXNOCRC pin or by
setting the transmit CRC disable bit in the Configuration 1 register. The
logic interaction between the TXNOCRC pin and CRC disable bit is
described in
Table 4
.
Note:
1 = No Append; 0 = Append
Table 4
TXCRC Bit and TXNOCRC Pin Logic
TXCRC_DIS Bit
TXNOCRC Pin
CRC Appended to End of Packet
1
1
No
1
0
No
0
1
No
0
0
Yes
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