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GS6150/GS6151/GS6152
User Guide Rev.1
PDS-060927 June 2015
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Semtech
Propietary & Confidential
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1. Introduction
The GS6150/GS6151/GS6152 are low power multi-rate serial digital re-clockers with 6G
UHD-SDI capability, designed to automatically recover the embedded clock from a
digital video signal and re-time the incoming video. The devices are compliant with
SMPTE ST 2081 (proposed), ST 424, and ST 259-C. The devices support data rates of
270Mb/s, 1.485Gb/s, 2.97Gb/s, and 5.94Gb/s. This document describes the contents,
features, and use of the GS6150/GS6151/GS6152 IBIS-AMI model. The model includes all
equalization, de-emphasis and swing settings of the GS6150/GS6151/GS6152 and
facilitates simulation of the GS6150/GS6151/GS6152 in EDA platforms compliant with
IBIS 5.0.
The remainder of this document refers to the GS615x IBIS-AMI. All features described in
this guide are supported by the GS6150, GS6151 and GS6152, unless otherwise
specified.
2. GS615x IBIS-AMI Model
The GS615x IBIS-AMI model is comprised of Rx and Tx models. The Rx model applies
equalization to a signal received from a channel. The received signal is then transmitted
into another channel using the Tx model. Note that clock and data recovery (CDR) is not
included in the model. Therefore, the Rx and Tx models have to be used in two separate
testbenches to optimize the chip settings and board design as shown in Figure 2-1.
Figure 2-1: Receiver and Transmitter Testbenches using the GS615x IBIS-AMI Model
Please be advised that the receiver model output signal represents the signal at the
output of the on-chip equalizer and the transmitter model input is the signal after the
CDR. In order to make sure that the CDR can recover the data and clock signals without
any errors, the signal at the equalizer output should have less than 0.5UI jitter and more
than 100mV
ppd
vertical eye opening. In other words, the jitter tolerance of the CDR is
0.5UI and the receiver sensitivity is 100mV
ppd
for BER of 10
-12
. The user should optimize
the equalizer output to have the maximum vertical and horizontal eye opening as
shown in Figure 2-2. Please note that this eye diagram will be sliced before going into
the CDR and its shape is not very important as long as it has low jitter and high vertical
eye opening. The slicers have not been included in the receiver model in order to build
a linear model.
Tx
Rx
Receiver Testbench Transmitter Testbench
Rx
Tx
GS615x
Channel 2
Channel 1
GS6150/GS6151/GS6152
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Figure 2-2: Optimized Eye Diagram at the Receiver Output
2.1 GS615x Receiver IBIS-AMI Model
The GS615x Receiver IBIS-AMI model consists of three parts: (1) the Analog Termination
IBIS model, (2) the Receiver AMI model and (3) the QFN package model. The block
diagram in Figure 2-3 shows the sequence of signal flow and the individual parts of the
model. The external S-parameter file for the QFN Package model extends the accuracy
of the package effects beyond which can be described by R, L and C components in the
IBIS 5.0 standard. The external S-parameter data is processed as part of the channel by
the EDA platforms.
Figure 2-3: GS615x Receiver IBIS-AMI Model
2.1.1 GS615x Receiver IBIS Model
The receiver IBIS model provides the characterized GS615x Receiver input termination
which is used by the EDA platform to determine the time-domain impulse response for
the channel. The model is based on a single-ended non-inverting characterization of the
GS615x Receiver and the EDA platform develops a differential model from
complimentary copies of the single-ended model. Note that the IBIS model only
contains the DC termination impedance of the receiver (I-V tables in IBIS file) and doing
frequency dependent simulations (e.g. return loss simulations) using the IBIS file is not
accurate.
time, psec
Density
Analog
Term
QFN Package
(S-parameters)
AMIFrom Channel
IBIS-AMI Model
GS6150/GS6151/GS6152
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2.1.2 GS615x Receiver AMI Model
The GS615x Receiver model features adjustable trace equalization for PCB trace
dielectric losses up to half the maximum supported data rate, or 3GHz. The equalization
setting can be adjusted by the following model specific parameters:
1. Trace_EQ_Control: The equalization has two settings: the LOW (default) setting is
optimized for compensating the high-frequency losses associated with 0-7dB of
trace loss at 1.5GHz for data rates of 2.97Gb/s and below, and for 0-10dB of trace
loss at 3GHz for 5.94Gb/s. The HIGH setting is optimized for trace loss greater than
7dB at 1.5GHz for data rates 2.97Gb/s and below.
2. Trace_EQ_Bypass: All the equalization blocks are bypassed when
Trace_EQ_Bypass is set to 1.
Note: Trace Equalizer Bypass is not supported on the GS6150. Trace_EQ_Bypass should
be set to 0 for designs using the GS6150.
2.1.3 GS615x Receiver Package Model
The GS615x receiver QFN package models are provided in 4-port touchstone
s-parameter files. The GS6150 and GS6152 receiver package models are contained in
GS6150_52_Rx_pkg.s4p and the GS6151 receiver package model is contained in
GS6151_Rx_pkg.s4p.
2.2 GS615x Transmitter IBIS-AMI Model
The GS615x Transmitter IBIS-AMI model consists of three parts: (1) the Analog Driver IBIS
model, (2) the Transmitter AMI model, and (3) the QFN package model. The block
diagram in Figure 2-4 shows the sequence of the signal flow and the individual parts of
the model.
Figure 2-4: GS615x Transmitter IBIS-AMI Model
Table 2-1: Trace_EQ_Control Parameter in the Receiver AMI Model
Trace_EQ_Control Trace Loss @ ≤2.97Gb/s Trace Loss @ 5.94Gb/s
0 (LOW) 0-7dB 0-10dB
1 (HIGH) >7dB —
Analog
Term
QFN Package
(S-parameters)
AMI To Channel
IBIS-AMI Model
GS6150/GS6151/GS6152
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2.2.1 GS615x Analog Driver IBIS Model
The Analog Driver IBIS model receives processed signal information from the
Transmitter AMI model and applies the analog characteristics of the GS615x Transmit
driver. The model is based on a single-ended non-inverting characterization of the
GS615x Receiver and the EDA platform develops a differential model from
complimentary copies of the single-ended model.
2.2.2 GS615x Transmitter AMI Model
The GS615x Transmitter AMI model consists of programmable swing and de-emphasis
settings which can be adjusted by model specific parameters. These parameters are
described below. Note that these parameters are the same as the registers in the Data
Sheet. It is highly recommended that the user review the GS6150, GS6151 or GS6152
Data Sheet and register descriptions carefully before using the model.
1. Output_Swing: Sets the output swing level (amplitude) when the feature is
enabled.
Table 2-2: Output_ Swing in Transmitter AMI Model
Output_Swing Register Value Swing
0 0000
230mV
ppd
1 0001
275mV
ppd
2 0010
325mV
ppd
3 0011
370mV
ppd
4 0100
410mV
ppd
5 0101
460mV
ppd
6 0110
510mV
ppd
7 0111
560mV
ppd
8 1000
605mV
ppd
9 1001
655mV
ppd
10 1010
705mV
ppd
11 1011
755mV
ppd
12 1100
800mV
ppd
13 1101
840mV
ppd
14 1110
890mV
ppd
15 1111
930mV
ppd
GS6150/GS6151/GS6152
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2. DeEmphasis_Level: Selects the output de-emphasis level.
2.2.3 GS615x Transmitter Package Model
The GS6150 QFN transmitter package models are provided in 4-port touchstone
s-parameter files. The GS6150 and GS6152 transmitter package models are contained in
GS6150_52_Tx_pkg.s4p and the GS6151 transmitter package model is contained in
GS6151_Tx_pkg.s4p.
Table 2-3: DeEmphasis_Level in Transmitter AMI Model
DeEmphasis_Level De-emphasis Level
0 0dB (de-emphasis off )
11.2dB
22.5dB
34.1dB
46.0dB
58.5dB
6 12.0dB
GS6150/GS6151/GS6152
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3. Correlation
In this section, the GS615x IBIS-AMI model is compared with laboratory measured
results. The eye diagrams at the GS615x output at 3G, and 6G data rates are shown in
Figure 3-1. The input signal in these simulations and measurements is PRBS7.
Figure 3-1: Comparison of the Eye Diagrams from Laboratory Measured Results
with Simulations Using the GS615x IBIS-AMI Model at 3G, and 6G Data Rates
IMPORTANT NOTICE
Information relating to this product and the application or design described herein is believed to be reliable, however such information is
provided as a guide only and Semtech assumes no liability for any errors in this document, or for the application or design described herein.
Semtech reserves the right to make changes to the product or this document at any time without notice. Buyers should obtain the latest relevant
information before placing orders and should verify that such information is current and complete. Semtech warrants performance of its
products to the specifications applicable at the time of sale, and all sales are made in accordance with Semtech’s standard terms and conditions
of sale.
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS,
DEVICES OR SYSTEMS, OR IN NUCLEAR APPLICATIONS IN WHICH THE FAILURE COULD BE REASONABLY EXPECTED TO RESULT IN PERSONAL
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harmless against all claims, costs damages and attorney fees which could arise.
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suitability of its products for any particular purpose. All rights reserved.
© Semtech 2015
GS615x
User Guide Rev.1
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Contact Information
Semtech Corporation
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111, Fax: (805) 498-3804
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