AN983 ETC [List of Unclassifed Manufacturers], AN983 Datasheet - Page 61

• Manufacturer Part Number: AN983
• Description: PCI/miniPCI-to-Ethernet LAN Controller
• Manufacturer: ETC [List of Unclassifed Manufacturers]

8.3 TRANSMIT SCHEME AND TRANSMIT EARLY
8.3.1 TRANSMIT FLOW
8.3.2 TRANSMIT PRE-FETCH DATA FLOW
Rev. 1.8
threshold DO TRANSMIT read the rest data
The flow of packet transmit is shown as below.
INTERRUPT
Transmit FIFO size=2K-byte
Two packets in the FIFO at the same time
Meet the transmit min. back-to-back
no deferring and greater than tx
read data and put into tx fifo
available descriptor(own=1)
AN983B read descriptor
generate interrupt
write descriptor
AN983B
collision ?
Fig - 9 Transmit flow
www.admtek.com.tw
ADMtek Inc.
PCI/miPCI Fast Ethernet Controller with integrated PHY
No
Initial
Program the descriptor, and place data
into the host memory
Change own bit to 1
Write tx demand poll
Yes
End
own=0
back -off
61