国产精品成人VA在线观看-国产乱妇乱子视频在播放-国产日韩精品一区二区三区在线-国模精品一区二区三区

參數(shù)資料
型號: W89C940
廠商: WINBOND ELECTRONICS CORP
英文描述: ELANC-PCI (TWISTED-PAIR ETHER-LAN CONTROLLER WITH PCI INTERFACE)
中文描述: ELANC -的PCI(雙絞線醚局域網(wǎng)控制器帶有PCI接口)
文件頁數(shù): 14/61頁
文件大小: 353K
代理商: W89C940
W89C940
14
BOOT PROM ACCESS FUNCTION
Boot PROM Operation
For diskless applications, the system requires an on-board boot device. The ELANC-PCI allows the system to
use an on-board BOOT PROM as the boot device.
The BOOT PROM is essentially a byte-read device. ELANC-PCI will fetch a byte from the BOOT PROM and
drive the AD bus of the PCI Interface. If the system do a word read command, the ELANC-PCI will invoke two
byte read operation with consecutive address and drove the second byte on another byte of the PCI interface.
For double word command, the ELANC-PCI will deassert the TRDY# until four read operation with consecutive
address to the BOOT PROM is completed and then the four bytes of data will be drove onto the 32 bits data bus
of PCI.
W89C940 can support the EPROM and Flash memory with 220nsec access time with the size up to 256KB. In
order to support 64KB,128KB and 256KB size with 15-bit address bus, W89C940 use MSA14 to latch the high
address bits MSA[17:14] from MSA[13:10]. The structure for address latch is shown as following.
W89C940
74LS373
EPROM
MSA14/L
MSA[9:0]
MSA[13:10]
MSA[17:14]
相關(guān)PDF資料
PDF描述
W89C982 INTEGRATED MULTIPLE REPEATER II
W89C982AF INTEGRATED MULTIPLE REPEATER II
W8NB80 N - CHANNEL 800V - 1.2ohm - 7.5A - TO-247 PowerMESH MOSFET
W90100F Embedded Micro-Controller(32位嵌入式的微控制器)
W90210F PA-RISC Embedded Micro-Controller(惠普PA-RISC結(jié)構(gòu)的32位嵌入式微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W89C940F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10M PCI-Bus Ethernet Network Interface Controller
W89C982 制造商:WINBOND 制造商全稱:Winbond 功能描述:INTEGRATED MULTIPLE REPEATER II
W89C982AF 制造商:WINBOND 制造商全稱:Winbond 功能描述:INTEGRATED MULTIPLE REPEATER II
W8C2-DNL 制造商:Hwei Lung Precision Machinery 功能描述:TORCH 8 LED BLACK 2C
W8D10PF29033 制造商:TE Connectivity 功能描述: