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參數(shù)資料
| 型號(hào)： | AM7968-125JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| 中文描述： | LINE DRIVER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁(yè)數(shù)： | 65/127頁(yè) |
| 文件大?。?/td> | 730K |
| 代理商： | AM7968-125JC |
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AMD
61
TAXIchip Integrated Circuits Technical Manual
using the Sync symbol to define byte boundaries. If the byte boundaries must be
re-aligned (on power-up or re-acquisition of signal), the logic will ensure that the CLK is
stretched (never shortened) upon re-sync to the new byte alignment. Due to this
behavior, the CLK output from the Receiver is not suitable as a direct frequency
reference for another TAXI Transmitter or Receiver. CLK is intended to be used by the
host system as a clock synchronous with the received data.
Figure 4-2
Casc aded Rec eiver Cloc k Connec tions
SERIN– SERIN+
SERIN– SERIN+
SERIN– SERIN+
12.5 MHz
Crystal
OSC
RX1
Am7969
(Primary Receiver)
V
CC
CNB
CLK
X2
X1
IGM
DMS
RX2
Am7969
IGM
X1
DMS
RX3
Am7969
IGM
X1
DMS
CNB
CNB
X2
X2
N/C
From Serial Media
12330E-6
4.2.1 Casc ade Mode Rec eivers (Am7969-125 Only)
When using an on-board TTL clock source, Receivers which are in Cascade mode
should have their X1 pin tied to the Crystal Oscillator and their X2 pin grounded.
Figure 4-2 shows a typical cascaded Receiver clock connection. The frequency source
for the Local mode Receiver should be either a crystal oscillator (as shown) or another
external TTL source. It should not be the CLK output of another Receiver. As discussed
above, the CLK output from the Receiver is not suitable as a frequency source for other
TAXI Receivers.
5.0 INT ERFACING WIT H T HE S ERIAL MEDIA
The Am7968/Am7969 TAXlchip set is capable of providing a high speed point-to-point
serial link over fiber-optic, coaxial, or twisted pair media. The choice of the appropriate
medium depends primarily on line length and data rate. This chapter discusses the
issues involved in media choice and the requirements for driving different types of
media.
Any TAXIchip set to media interface design must first take into account the electrical
properties of the TAXI Transmitter and TAXI Receiver. The Transmitter serial output
drivers are open emitter, emitter followers which generate pseudo-ECL (PECL) levels
when terminated by pull-down resistors to a voltage more negative than V
OL
. PECL is
ECL referenced to the +5 V supply, so that V
OH
= (5–0.8) and V
OL
= (5–1.8) volts. A safe
termination voltage which guarantees meeting V
OL
is 3 V or less. The Receiver input is a
long-tailed pair which will switch on 50 mV differential input voltage, with a large
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| Am7968-125LMC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| AM7968-175DC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7968-175DMC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7968-175LMC | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
| Am7969 | TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM7968-125JCB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
| AM7968-125JC-G | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM7968-125LE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
| AM7968-125LEB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Transmitter |
| AM7968-125LKC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface) |
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