參數(shù)資料
型號： W89C840F
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 100/10Mbps Ethernet Controller(100/10Mbps以太網(wǎng)控制器)
中文描述： 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 24/72頁
文件大?。?/td> 731K
代理商： W89C840F
W89C840F
- 24 -
Usually, the on-board boot ROM data can be read by the system BIOS during
host system
booti ng or power-up/reset.
W89C840F also provides another access way for the application
program to do
som unusual appl i cati ons, such as
down loading the ROM code or re-
programming the ROM code on line.
The procedures for on-line reading the on-board ROM device are described as following.
1) Write the offset address into the C28/CBROA.
2) Reset the bit 11 of C24/CMIIR to 0.
3) Set the bit 14 of C24/CMIIR to 1.
4) read back the data form C24/CMIIR
The procedures for on-line writing the on-board ROM device are described as following
1) Write the offset address into the C28/CBROA.
2) Reset the bit 11 of C24/CMIIR to 0.
3) Write the one byte data into C24/CMIIR bit 0 to bit 7.
4) Set the bit 13 of C24/CMIIR to 1.
The bit 13 and bit 14 of the register C24/CMIIR should not be set to 1 at the same time. In the
case of both of the bit 13 and bit 14 are 1, it will not properly initialize the read or the write operation for
ROM device. The application program can check the contents of the register C24/CMIIR to know if the
read or write operation is already completed or not. The W89C840F will start the read or the write
operation when the bit 14 or bit 13 are set to high and will reset the bit 14 or bit 13 to 0 automatically
after the read/write operation is completed. For the writing operation, the software driver should not start
up the next write data request until the bit 13 of C24/CMIIR is reset to 0 by the W89C840F. For the read
operation, the read data will be valid only if the bit 14 of the register C24/CMIIR is reset to 0 by the
W89C840F.
The operation of reading or writing for the on-board ROM device through the registers
C24/CMIIR and C28/CBROA will not affect the memory space configuration of the host system because
either read or write operation is performed through the PCI I/O access command.
MII management function
The MII management function provided by W89C840F can be used to access the registers of the
external physical layer device. The bits 16, 17, 18 and 19 of C24/CMIIR are designed for MII
management.
When the bi t 18 i s reset
low, the MDIO signal on MII bus is an input of W89C840F.
The data on the MDIO will be reflected transparently on the bit 19 of the register C24/CMIIR. While the
bit 18 is set to high, the MDIO signal on MII will be changed to be an output pin of W89C840F and the
data written to the bit 17 of the register C24/CMIIR will be driven onto the MDIO. To generate the
necessary clock for MII management, the application program can write 1 and 0 alternately to the bit 16
of the register C24/CMIIR. The clock is used by the external physical layer device to clock in the written
data or to clock out the read data.
相關PDF資料
PDF描述
W89C92P 10M CMOS Coaxial Transceiver
W89C940F 10M PCI-Bus Ethernet Network Interface Controller
W91040
W91212 Tone/Pulse Dialer With Redial Function(具有重撥功能的音頻/脈沖撥號器)
W91214 Tone/Pulse Dialer With Redial Function(具有重撥功能的音頻/脈沖撥號器)
相關代理商/技術參數(shù)
參數(shù)描述
W89C841D 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F 制造商:WINBOND 制造商全稱:Winbond 功能描述:3-IN - 1 10/100M FAST ETHERNET CONTROLLER
W89C841F/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-IN-1 100BASE-TX/FX & 10BASE-T Ethernet Controller
W89C880F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller
W89C92 制造商:WINBOND 制造商全稱:Winbond 功能描述:PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*