- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363665 > NS32490D (National Semiconductor Corporation) NIC Network Interface Controller(NIC網(wǎng)絡(luò)接口控制器) PDF資料下載
參數(shù)資料
| 型號： | NS32490D |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | NIC Network Interface Controller(NIC網(wǎng)絡(luò)接口控制器) |
| 中文描述： | NIC網(wǎng)絡(luò)接口控制器（NIC網(wǎng)絡(luò)接口控制器） |
| 文件頁數(shù)： | 33/56頁 |
| 文件大小： | 689K |
| 代理商： | NS32490D |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁當前第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
13.0 Bus Arbitration and Timing
The NIC operates in three possible modes:
TL/F/8582–64
Upon power-up the NIC is in an indeterminant state. After
receiving a Hardware Reset the NIC comes up as a slave in
the Reset State. The receiver and transmitter are both dis-
abled in this state. The reset state can be reentered under
three conditions, soft reset (Stop Command), hard reset
(RESET input) or an error that shuts down the receiver or
transmitter (FIFO underflow or overflow). After initialization
of registers, the NIC is issued a Start command and the NIC
enters Idle state. Until the DMA is required the NIC remains
in an idle state. The idle state is exited by a request from the
FIFO in the case of receive or transmit, or from the Remote/
DMA in the case of Remote DMA operation. After acquiring
the bus in a BREQ/BACK handshake the Remote or Local
DMA transfer is completed and the NIC reenters the idle
state.
DMA TRANSFERS TIMING
The DMA can be programmed for the following types of
transfers:
16-Bit Address, 8-bit Data Transfer
16-Bit Address, 16-bit Data Transfer
32-Bit Address, 8-bit Data Transfer
32-Bit Address, 16-bit Data Transfer
All DMA transfers use BSCK for timing. 16-Bit Address
modes require 4 BSCK cycles as shown below:
16-Bit Address, 8-Bit Data
TL/F/8582–65
33
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NS32828 | 1 Megabit High Speed Dynamic RAM Controller/Drivers |
| NS32829 | 1 Megabit High Speed Dynamic RAM Controller/Drivers |
| NS32FX16-15 | FILM/M CAPACITANCE=0.001 VOLT=630 |
| NS32FX16-20 | Imaging/Signal Processor |
| NS32FX16-25 | Imaging/Signal Processor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NS32491 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Serial Network Interface |
| NS32491A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| NS32492B | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Coaxial Transceiver Interface |
| NS32532-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| NS32532-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。