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AN983 数据表(PDF) 61 Page - List of Unclassifed Manufacturers

部件名 AN983
功能描述  PCI/miniPCI-to-Ethernet LAN Controller
PDF  91 Pages
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制造商  ETC [List of Unclassifed Manufacturers]
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标志 ETC - List of Unclassifed Manufacturers

AN983 数据表(HTML) 61 Page - List of Unclassifed Manufacturers

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



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