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參數(shù)資料
| 型號： | LAN91C100FDTQFP |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY |
| 中文描述： | 2 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP208 |
| 封裝： | TQFP-208 |
| 文件頁數(shù)： | 51/79頁 |
| 文件大?。?/td> | 585K |
| 代理商： | LAN91C100FDTQFP |
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FEAST Fast Ethernet Controller with Full Duplex Capability
SMSC DS – LAN91C100FD Rev. D
Page 51
Rev.
10/14/2002
PRELIMINARY
In this case, the transmit interrupt service routine can find the next packet number to be serviced by
reading the TX DONE PACKET NUMBER at the FIFO PORTS register. This eliminates the need for the
driver to keep a list of packet numbers being transmitted. The numbers are queued by the LAN91C100FD
and provided back to the CPU as their transmission completes.
2. One interrupt per sequence of packets: Enable TX EMPTY INT and TX INT, set AUTO RELEASE=1.
TX EMPTY INT is generated only after transmitting the last packet in the FIFO.
TX INT will be set on a fatal transmit error allowing the CPU to know that the transmit process has
stopped and therefore the FIFO will not be emptied.
This mode has the advantage of a smaller CPU overhead, and faster memory de-allocation. Note that
when AUTO RELEASE=1 the CPU is not provided with the packet numbers that completed
successfully.
Note:
The pointer register is shared by any process accessing the LAN91C100FD memory. In order to allow
processes to be interruptable, the interrupting process is responsible for reading the pointer value before
modifying it, saving it, and restoring it before returning from the interrupt.
Typically there would be three processes using the pointer:
1. Transmit loading (sometimes interrupt driven)
2. Receive unloading (interrupt driven)
3. Transmit Status reading (interrupt driven).
1) and 3) also share the usage of the Packet Number Register. Therefore saving and restoring the PNR is
also required from interrupt service routines.
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相關(guān)代理商/技術(shù)參數(shù) |
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| LAN91C100QFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:SMSC 功能描述: |
| LAN91C100QFP WAF | 制造商:SMSC 功能描述: |
| LAN91C110 | 制造商:SMSC 制造商全稱:SMSC 功能描述:FEAST FAST ETHERNET CONTROLLER FOR PCMCIA AND GENERIC 16-BIT APPLICATIONS |
| LAN91C110-JD | 制造商:SMSC 功能描述: |
| LAN91C110-PU | 功能描述:以太網(wǎng) IC Non-PCI 10/100 Ethernet MAC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
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