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參數(shù)資料
| 型號(hào)： | MB86965A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁數(shù)： | 39/76頁 |
| 文件大小： | 394K |
| 代理商： | MB86965A |
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MB86965
44
Receive-Read pointer also forms a seamless ring.
EtherCoupler automatically provides all necessary
buffer-pointer management functions, to relieve host
system drivers of this time-consuming task. Accom-
plished faster in hardware than software, this not only
off-loads the host system but also speeds the communica-
tion process and increases throughput.
The Buffer Controller automatically prioritizes and
services requests for access to memory from Transmitter,
Receiver and host system. The Buffer Controller
provides complete packet-management functions by
updating buffer-memory pointers, allocating memory
space for incoming data packets, and controlling
pertinent bits within status registers.
The EtherCoupler arbitration mechanism provides
packet management, by interleaving packet-data accesses
to the buffer memory, so that operation appears to be
simultaneous. The host writes data to or reads data from
buffer memory via Buffer Memory Port register BMPR8
while the Receiver reads out data packets for transmission
or writes in data packets for storage. EtherCoupler
appears to independently serve the host system and
network access interfaces, whose associated first-in,
first-out (FIFO) circuits provide time for buffer
interleaving.
As shown in Figure 12, packet data pipelines through the
system to increase performance and throughput, with the
Buffer Controller supporting all cases of simultaneous
access to buffer memory, such as: (1) network data
storage in the Receive buffer; (2) host retrieval of packets
from the Receive buffer; (3) host loading of packet data
into the Transmit buffer; (4) transmitter data acquisition
for transmission from the Transmit buffer; and (5) any
combination, including all of these, simultaneously.
Figure 12. Simultaneous Access to Buffer Memory
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB86965B | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:EtherCoupler ETHERNET CONTROLLER WITH 10BASE?T TRANSCEIVER |
| MB86965BPF-G-BND | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:EtherCoupler ETHERNET CONTROLLER WITH 10BASE?T TRANSCEIVER |
| MB86967 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces |
| MB86967PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces |
| MB86977 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:IP PACKET FORWARDING ENGINE |
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