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參數(shù)資料
| 型號： | 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)： | 37/76頁 |
| 文件大?。?/td> | 394K |
| 代理商： | MB86965A |
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MB86965
42
BUFFER CONTROLLER
Figure 10. Buffer Memory Organization
As shown in Figure 10, EtherCoupler uses dedicated
buffer memory to store data packets to be transmitted to
and received from the network. By direct connection to
the EtherCoupler controller rather than a separate, local
microprocessor bus, buffer memory eliminates the need
for a local microprocessor. The Buffer Controller keeps
track of buffer memory partitioning, as well as
automatically allocating and updating receive and
transmit pointers, eliminating these tasks from software
overhead. Benchmark performance tests typically can
surpass those of competing controllers because Ether-
Coupler provides a high level of automation and
high-performance packet-buffering.
EtherCoupler on-chip Buffer Controller manages access
to buffer memory by updating internal address pointers,
which handle transmit, retransmit, receive, rejection of
packets with errors, and data transfers to and from the
host. The easy-to-operate EtherCoupler access-manage-
ment feature relieves the host of buffer-management
functions and substantially reduces software require-
ments. EtherCoupler automatically rejects packets with
alignment, CRC or short-length errors. Packet rejection
occurs unless the host sets the Acpt Bad Pkts bit, which
passes packets received with errors to the host processor
and sets appropriate error status bits to inform the host of
the error. EtherCoupler allows reception of packets as
small as six bytes by setting the Acpt short Pkts bit.
Normal operation requires IEEE minimum packet
length, excluding Preamble and CRC, of 60 bytes.
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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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