LAN9118MT Standard Microsystems (SMSC), LAN9118MT Datasheet - Page 55
LAN9118MT
Manufacturer Part Number
LAN9118MT
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN9118MT.pdf
(170 pages)
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High-Performance Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9118
4.12.2
TX Command Format
The TX command instructs the TX FIFO controller on handling the subsequent buffer. The command
precedes the data to be transmitted. The TX command is divided into two, 32-bit words; TX command
‘A’ and TX command ‘B’.
There is a 16-bit packet tag in the TX command ‘B’ command word. Packet tags may, if host software
desires, be unique for each packet (i.e., an incrementing count). The value of the tag will be returned
in the RX status word for the associated packet. The Packet tag can be used by host software to
uniquely identify each status word as it is returned to the host.
Both TX command ‘A’ and TX command ‘B’ are required for each buffer in a given packet. TX
command ‘B’ must be identical for every buffer in a given packet. If the TX command ‘B’ words do not
match, the Ethernet controller will assert the Transmitter Error (TXE) flag.
DATASHEET
55
Revision 1.0 (03-17-05)
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