- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄377895 > MB86967 (Fujitsu Limited) LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces PDF資料下載
參數(shù)資料
| 型號(hào)： | MB86967 |
| 廠商： | Fujitsu Limited |
| 英文描述： | LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces |
| 中文描述： | 局域網(wǎng)控制器與PC卡，ISA總線(xiàn)和通用總線(xiàn)接口 |
| 文件頁(yè)數(shù)： | 22/129頁(yè) |
| 文件大?。?/td> | 1499K |
| 代理商： | MB86967 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)當(dāng)前第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)
22
MB86967
7. Buffer Controller
7.1 General
The MB86967 uses a dedicated buffer memory, organized as shown in Figure 2, for intermediate storage of
packets to be transmitted, and of packets received from the network. The MB86967 can operate with 8 or 32
kilobytes of total buffer memory, including both transmit and receive spaces. Memory partitioning into transmit
and receive sections is controlled by the system software. The total size of the transmit buffer space can be up
to 16 kilobytes. The buffer memory not used for the transmitter is used for the receiver, and is automatically
configured as a ring buffer. Packets are stored head-to-toe in the receive buffer, as they are in the transmit buffer.
However, each packet in the receive buffer is aligned on an eight-byte boundary. As packets are being stored
in the receive buffer, as the end of the linear addressing space is reached, the chip’s receive write pointer
automatically wraps around to the top of the receive addressing range to make a seamless ring. The receive
read pointer does the same as the packets are read out to the system. By programming the sizes allocated to
transmit and receive buffers, an optimum usage of the memory can be selected according to the demands of a
particular application.
The buffer controller keeps track of buffer memory partitioning and allocation and updates internal address
pointers automatically for the tasks of transmit, retransmit, receive, rejection of packets with errors and data
transfers to and from the host. The host and its drivers are thus relieved of buffer management functions, making
the MB86967 easy to operate and substantially reducing software requirements. Packets with errors are normally
automatically rejected by the MB86967 as are packets shorter than the IEEE minimum length packet of 60 bytes,
excluding Preamble and CRC. Since these tasks can be done faster in hardware than in software, this not only
TRANSMIT BUFFERS
RECEIVED PACKET n+3
(LAST PART)
CURRENTLY AVAILABLE
FREE BUFFER AREA
RECEIVED PACKET n
RECEIVED PACKET n+1
RECEIVED PACKET n+2
RECEIVED PACKET n+3
(FIRST PART)
ONE OR TWO
TRANSMIT BUFFER
RECEIVE BUFFER RING
(30 KILOBYTES MAX)
Figure 2 Buffer Memory Organization
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MB86967PFV | LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces |
| MB86977 | IP PACKET FORWARDING ENGINE |
| MB86977PFV-G-BND | IP PACKET FORWARDING ENGINE |
| MB86H20 | SmartMPEG |
| MB86H21 | MPEG-2 Decoder with Integrated NDS ICAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB86967PFV | 制造商:FUJITSU 制造商全稱(chēng):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(chēng):Fujitsu Component Limited. 功能描述:IP PACKET FORWARDING ENGINE |
| MB86977PFV-G-BND | 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:IP PACKET FORWARDING ENGINE |
| MB86A21PMC-G-BNDE1 | 制造商:FUJITSU 功能描述: |
| MB86A21PMC-G-JNE1 | 制造商:FUJITSU 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。