參數(shù)資料
型號(hào)： Am7969
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(yè)數(shù)： 68/127頁(yè)
文件大?。?/td> 730K
代理商： AM7969
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AMD
64
TAXIchip Integrated Circuits Technical Manual
threshold level of the receiver’s differential amplifier. Once the Receiver recognizes the
state change, variations in the falling edge are not significant.
To avoid edge rate variations due to driver turn-off, we must equate the voltage to which
the driver is taken at turn-off with a point in the logic swing which will guarantee that the
Receiver changes state. Since PECL logic swings are 800 mV, we may safely choose a
500 mV change at the driver (100 mV past the midpoint) as a guaranteed state change
at the Receiver. If the driver turns off instantly, we require the voltage divider formed by
RE and Z0 to produce a 500 mV change from V
OH
. We can write:
V
OH
RE/(RE + Z0) = V
OH
– 0.5
4.1 x RE/(RE + Z0) = 3.6
RE = 7.33 Z0
As a general rule, we may then say that:
186 < RE < 7.33 Z0
Figure 5-3
Pull-Down and T ermination for AC Coupled Link
12330E-10
R2
V
CC
R1
SERIN
TAXI RX
SEROUT
TAXI TX
Pseudo-ECL
Driver
Copper Media
RE
C
Figure 5-4
S erial Link with Output Driver Model
12330E-11
R2
V
CC
R1
SERIN
TAXI RX
SWI
TAXI TX
Pseudo-ECL
Driver (Model)
Copper Media
RE
C
V
OH
R0
B
5.4 Baseline Wander and the AC Coupling Capac itor
The 4B/5B and 5B/6B data encoding schemes which are used by the TAXIchip set are
run-length limited to a maximum of 3 consecutive LOW states (non-transitions in NRZI).
This type of encoding ensures that on average there will be less than
±
10% variation in
the DC component of the encoded data.
When the encoded data is passed through an AC coupled link, the high-pass filtering of
the AC coupling will introduce jitter because of the fluctuating threshold caused by the
variation in DC component. This undesired side-effect of AC coupling is often described
相關(guān)PDF資料
PDF描述
Am7968-125DKC TAXIchip Integrated Circuits(Transparent Asynchronous Xmitter-Receiver Interface)
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)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM7969-100/B3A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver
AM7969-100/BXA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver
AM7969-100DC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver
AM7969-100DCB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver
AM7969-100DE 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Receiver
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