AN983B Datasheet, PDF (59/91 Pages) List of Unclassifed Manufacturers – PCI/miniPCI-to-Ethernet LAN Controller

AN983B PCI/miPCI Fast Ethernet Controller with integrated PHY
8.2.2 THE POINT OF DESCRIPTOR MANAGEMENT
OWN bit = 1, ready for network side access
OWN bit = 0, ready for host side access
Transmit Descriptor Pointers
next packet to be transmitted
own bit=2,
packet1 and packet 2 are
ready to transmit
Descriptor
0
Length 2 Length 1
Buffer1 pointer
Buffer2 pointer
1
Packet 1
1
Packet 1
empty descriptor
pointer
1
Packet 2
0
Data Buffer
Data
Length 1
Data
Length 2
end of ring
0
Fig - 7 Transmit pointers for descriptor management
Rev. 1.8
ADMtek Inc.
www.admtek.com.tw