參數(shù)資料
型號(hào)： Am7968-125DKC
廠商： Advanced Micro Devices, Inc.
英文描述： TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
中文描述： TAXIchip集成電路（透明異步Xmitter，接收器接口）
文件頁數(shù)： 65/127頁
文件大?。?/td> 730K
代理商： AM7968-125DKC
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
Am7969-125DKC TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
Am7968-175DKC TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
Am7969-175DKC TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
Am7969-125 TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
AM7969-125DC 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
AM7968-125DMC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
AM7968-125JC 制造商:Advanced Micro Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:
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
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