參數(shù)資料
型號(hào): NS32490D
廠商: National Semiconductor Corporation
英文描述: NIC Network Interface Controller(NIC網(wǎng)絡(luò)接口控制器)
中文描述: NIC網(wǎng)絡(luò)接口控制器(NIC網(wǎng)絡(luò)接口控制器)
文件頁(yè)數(shù): 7/56頁(yè)
文件大?。?/td> 689K
代理商: NS32490D
6.0 Direct Memory Access Control (DMA)
(Continued)
Dual Bus System
TL/F/8582–55
32-Bit DMA Operation
TL/F/8582–6
7.0 Packet Reception
The Local DMA receive channel uses a Buffer Ring Struc-
ture comprised of a series of contiguous fixed length 256
byte (128 word) buffers for storage of received packets. The
location of the Receive Buffer Ring is programmed in two
registers, a Page Start and a Page Stop Register. Ethernet
packets consist of a distribution of shorter link control pack-
ets and longer data packets, the 256 byte buffer length pro-
vides a good compromise between short packets and long-
er packets to most efficiently use memory. In addition these
buffers provide memory resources for storage of back-to-
back packets in loaded networks. The assignment of buffers
NIC Receive Buffer Ring
TL/F/8582–7
7
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