- 您現在的位置：買賣IC網 > PDF目錄363904 > W89C982 (WINBOND ELECTRONICS CORP) INTEGRATED MULTIPLE REPEATER II PDF資料下載
參數資料
| 型號： | W89C982 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | INTEGRATED MULTIPLE REPEATER II |
| 中文描述： | 集成的多中繼二 |
| 文件頁數： | 15/28頁 |
| 文件大小： | 277K |
| 代理商： | W89C982 |
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頁當前第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
Preliminary W89C982AF
Publication Release Date: November 1996
- 15 -
Revision A1
The other main function of the management logic is the port activity monitoring function. The internal
carrier sense signal of all network ports is sampled out serially. The accuracy of the carrier sense
signals is 10 bit times. The first bit samples the internal carrier sense signal of the AUI port, the
second bit samples TP0, the third bit samples TP1, and so forth. The tenth bit time is idle, and a
strobe signal will be active during the tenth bit time. With the help of the strobe signal, the serial
sampled carrier sense signal can be latched to a serial-to-parallel shifter.
IMPR II Programmable Options
Three IMPR II programmable options can set by this command via the appropriate bit in MSI data.
The three programmable options are CI reporting, AUI SQE test mask, and alternative port activity
monitor function, which correspond to bits C, S, and A, respectively.
CI Reporting
Setting bit C = 1 will alter the function of the STR pin. STR will become an input pin for repeater
management devices and PCRS will insert the CI bit immediately before the AUI bit.
AUI SQE Test Mask
Setting S = 1 will disable the AUI SQE test when the SQE signal is within the SQE test window and
no jam pattern will be asserted after transmitted packets. The SQE test window is from 6 bit times to
34 bit times. When the SQE signal is larger than the SQE test window, a collision condition has
occurred.
Alternative Port Activity Monitor
Setting A = 1 will enable the alternative PAM function, so that repeater management devices can
monitor the status of each port using the unmodified PCRS signal.
The IMPR II Kernel Logic
The kernel logic of the IMPR II includes a main state machine and glue logic, timers and counters,
jabber lockup and fragment extension logic, a PLL decoder, encoder and transmitter, a 64-bit FIFO
with FIFO control logic, and a preamble/jam generator. These blocks perform most of the operations
needed to fulfill the requirements of the IEEE repeater specification. When a packet is received by a
connected port, it is sent via the receive multiplexer to the PLL decoder. Data and collision status are
sent to the main state machine via the port partition/reconnection logic. This enables the main state
machine to determine the source of data to be repeated and the type of data to be transmitted. The
transmit data may be either the received packet's data field or a preamble/jam pattern consisting of a
1010... bit pattern.
Associated with the main state machine are a series of timers and counters which ensure that various
IEEE specification times (referred to as the TW1 to TW6 times) are fulfilled. The PLL decoder
decodes the received data from Manchester code format into NRZ format and recovers the jitter
accumulated over the receiving segment.
The preamble/jam generator and the FIFO compensate for the preamble bit loss caused by
receptions by the twisted pair line transceiver. The FIFO is used to store the bits of the data field
temporarily while the preamble/jam generator is sending the preamble of the transmitting packet. A
1010... jam pattern is generated under network collision conditions.
The jabber lockup and fragment extension logic monitors the retransmitted packet. A jam pattern will
be appended to short packets (less than 96 bits in length) to extend them to a full 96 bits. The jabber
相關PDF資料 |
PDF描述 |
|---|---|
| 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結構的32位嵌入式微控制器) |
| W90220F | PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的32位嵌入式微控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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: |
| W8D11PF29033 | 制造商:TE Connectivity 功能描述: |
| W8D16PF29023 | 制造商:TE Connectivity 功能描述: |
發布緊急采購，3分鐘左右您將得到回復。