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AN983 bảng dữ liệu(PDF) 57 Page - List of Unclassifed Manufacturers

tên linh kiện AN983
Giải thích chi tiết về linh kiện  PCI/miniPCI-to-Ethernet LAN Controller
PDF  91 Pages
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nhà sản xuất  ETC [List of Unclassifed Manufacturers]
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AN983 bảng dữ liệu(HTML) 57 Page - List of Unclassifed Manufacturers

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AN983B
PCI/miPCI Fast Ethernet Controller with integrated PHY
8.2 NETWORK PACKET BUFFER MANAGEMENT
8.2.1 DESCRIPTOR STRUCTURE TYPES
For networking operation, the AN983B transmits the data packet from transmit buffers in host
memory to AN983B’s transmit FIFO and receives the data packet from AN983B’s receive FIFO to
receive buffers in host memory. The descriptors that the AN983B supports to build in host memory
are used as the pointers of these transmit and receive buffers.
There are two structure types for the descriptor, Ring and Chain, supported by the AN983B and are
shown as below. The type selection is controlled by the bit24 of RDES1 and the bit24 of TDES1.
The transmit and receive buffers are physically built in host memory. Any buffer can contain either a
whole packet or just part of a packet. But it can’t contain more than one packet.
Ring structure
There are two buffers per descriptor in the ring structure. Support receives early interrupt.
.
.
.
.
.
.
Buffer2 pointer
Buffer1 pointer
Length 1
Length 2
End of Ring
own
CSR3 or CSR4
Data
Data
Descriptor Pointer
Data Buffer
Length 1
Length 2
Descriptor
Fig -
5
Ring structure of frame buffer
ADMtek Inc.
www.admtek.com.tw
Rev. 1.8
57



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