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GS12090
User Guide Rev.2
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Revision History
Contents
1. Hardware User Guide .....................................................................................................................................4
1.1 System Block Diagram ......................................................................................................................4
1.2 Quick Start Guide ................................................................................................................................4
1.2.1 Start-up Sequence .................................................................................................................4
1.3 Configuration 1 — Cable EQ Mode ..............................................................................................7
1.4 Configuration 2 — Cable Driver Mode .......................................................................................7
1.5 Configuration 3 — Output Balanced Mode ..............................................................................8
2. Software User Guide.......................................................................................................................................9
2.1 Installing the GS12090 Software GUI ..........................................................................................9
2.2 GUI Operation ................................................................................................................................... 13
2.2.1 Getting Started..................................................................................................................... 13
2.2.2 Device Settings Tab............................................................................................................ 14
2.2.3 Main Tab ................................................................................................................................. 14
2.3 Additional GUI Features ................................................................................................................ 17
2.3.1 Cable Tab................................................................................................................................ 17
2.3.2 Trace Tab ................................................................................................................................ 18
2.3.3 PRBS Tab................................................................................................................................. 18
2.3.4 Eye Monitor ........................................................................................................................... 20
3. Schematics ...................................................................................................................................................... 23
4. Board Layout .................................................................................................................................................. 26
5. Bill of Materials............................................................................................................................................... 28
Version ECO Date Changes and/or Modifications
2 038110 August 2018
Updated Figure A, and Section 1.
Added Section 2.1, and updated Section 2.
1 036575 April 2017
Added Table 1-2, Section 1.3, Section 1.4,
Section 1.5. Updated all figures to reflect EB
layout and updated GUI.
0 035453 March 2017 New document.
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General Description
This document provides guidance on how to use the GS12090 Evaluation Board
(EB-GS12090). It is recommended that the GS12090 Data Sheet (PDS-061188) is read
prior to reading this document in order to get familiar with the features of the GS12090.
Overview
The EB-GS12090 can be powered-up and evaluated out-of-the-box as a standalone kit
without GUI control. Connecting to a PC (using the supplied USB cable) enables
evaluation of the advanced features which are only accessible through the host
interface.
For a quick evaluation, refer to the Quick Start Guide section of this document.
For detailed descriptions of the supported evaluation features of the EBK, refer to the
GS12090 Data Sheet.
Kit Contents
The EBK-GS12090 contains the following components:
• EB-GS12090 board.
• USB Cable (for GUI communication).
• 5V power supply.
Figure A: EB-GS12090 Inputs, Outputs and Power Connections
DDO_P
USB
SW1
Reset
SW10
Model Select
Power (+5V)
DDO_N
SDIO
OUTPUT
DDI_N
DDI_P
INPUT
BI-DIRECTIONAL
SW3
GPIO State
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1. Hardware User Guide
1.1 System Block Diagram
Figure 1-1: System Block Diagram
1.2 Quick Start Guide
1.2.1 Start-up Sequence
1. Shunt Configuration
There are two shunts that need to be placed on the board (if the board is not already
populated with these) before being powered.
• J1– set this to 1.2V/1.8V/2.5V as desired for the evaluation
Note: If evaluating the output pre-emphasis features, it is suggested to set this to
2.5V.
• J2– set to 2.5V
2. Connect to USB interface or use in stand-alone mode.
Note:
• For further information on GUI installation, use, and features, see all of Section 2.
• Stand-alone mode does not require a USB connection to the device. For more
information on stand-alone mode see Step 4 below.
• If using GUI control and the board or microcontroller is reset, the GUI will need to
be reconnected to the Evaluation Board. See 2.2.1 Getting Started for information
on reconnecting the Evaluation Board.
GS12090
50Ω SMA
DDI
DDO
50Ω SMA
50Ω SMA
50Ω SMA
75Ω BNC
BNC SDIO
GS12090 Data Path - 75Ω single-ended
GS12090 Data Path - 100Ω dierential
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3. Power
Apply a 5V power supply to the board using the TP14 and TP13 or via the barrel jack J43.
Note: Do not apply more than 5.5V. If power has been correctly applied, D1 will light. If
there is a fault, D34 will light. If D1 does not light, check the voltage and polarity of the
source.
4. Stand-Alone Mode
Stand-alone mode allows for use of the GS12090 evaluation board without connection
to a PC. The available modes using this control are outlined in Table 1-2: SW10 Mode
Selection. To use the evaluation board in this mode, please see the following steps:
1) Complete Steps 1 and 3 listed above.
2) Set SW10 to the desired mode (see Table 1-2).
3) Press SW1 (RST) on the board, or remove and reapply power to the evaluation
board.
Note: If using stand-alone mode controls while the evaluation board is connected
to the GUI, the host must complete the following:
a) Click the “Disconnect” button located at the top of the GUI.
b) Press SW1 (RST) on the board, or remove and reapply power to the evaluation
board.
c) Reconnect the GUI to the evaluation board. See 2.2.1 Getting Started for
instructions on reconnecting the evaluation board to the GUI.
5. DIP Switch Configuration
No alterations need to be made to the default DIP switch configuration for SW4 and
SW2.
SW3 can be used to switch pull-down resistors on each of the GS12090’s GPIO lines. The
pins are pulled up to 1.8V if the switch is open.
SW10 is used to change modes as described in Step 4. SW10 can also be used to
program custom modes to the on board microcontroller, see “Save to Flash” in 2.2.2
Device Settings Tab.
6. Indicators
Notes:
1. See “GPIO Control” in 2.2.2 Device Settings Tab for further information on changing GPIO functions.
2. GPIO numbers on the silkscreen are reversed on Rev.1 PCBs. Use the test point and LED numbers listed in
the above chart as they are correct.
Table 1-1: Indicators
LED Number GPIO Pin Test Point Default Function
D2 GPIO3 TP6 Input Select Control (Input)
D3 GPIO2 TP8 Sleep Control (Input)
D4 GPIO1 TP9
PLL Lock Status Indicator
(Output)
D5 GPIO0 TP7 LOS Indicator (Output)
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Figure 1-2: SW10.1 Location
Table 1-2: SW10 Mode Selection
SW10[4:1] Mode Description
0000 Cable EQ
Utilizes DDI/SDIO signal path.
See Section 1.3 for further information.
0001 Cable Driver
Utilizes SDI/DDO signal path.
See Section 1.4 for further information.
0010 Balanced Mode
Designed for measuring output return loss
from the GS12090.
See Section 1.5 for further information.
0011 to 1111 User Configurable
User defined switch configurations are
available for settings 0011 to 1111.
5V Main Power
Power Reset (SW1)
On-board
USB Dongle
Connection
SW10.1
SW10.2
SW10.3
SW10.4
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1.3 Configuration 1 — Cable EQ Mode
To use the GS12090 Evaluation Board in Cable EQ mode, complete one of the three
methods described below, then apply a SDI signal to SDIO. The differential output will
be available on SMAs labelled DDO.
Note: The numbers found in the brackets refer to Figure 2-11 and are used to show
locations in the GUI.
1. Set SW10 to 0000 as described in Step 4 of 1.2.1 Start-up Sequence.
2. Using the GUI, ensure that the Input Select Mode is set to “CSR,” then set Input to
Cable EQ (6).
3. Set Input Select Mode to “Pin” and toggle the GPIO pin that is set to “Input Select”
via SW3 (6).
Note: By default GPIO3 is set pin “Input Select,” and while Input Select Mode =
Pin, driving GPIO3 HIGH will put the GS12090 into Cable Driver Mode, and driving it
LOW will put the GS12090 into Cable EQ mode.
Figure 1-3: Configuration 1 — Cable EQ Mode
1.4 Configuration 2 — Cable Driver Mode
To use the GS12090 Evaluation Board in Cable Driver mode, complete one of the three
methods described below, then apply a SDI signal to the SMA inputs labelled DDI. The
single ended output will be available on SDIO.
Note: The numbers found in the brackets refer to Figure 2-11 and are used to show
locations in the GUI.
1. Set SW10 to 0001 as described Step 4 of 1.2.1 Start-up Sequence.
2. Using the GUI, ensure that the Input Select Mode is set to “CSR”, then set Input to
Trace EQ (6).
3. Set Input Select Mode to “Pin” and toggle the GPIO pin that is set to “Input Select”
via SW3 (6).
Note: By default GPIO3 is set pin “Input Select”, and while Input Select Mode = Pin,
driving GPIO3 HIGH will put the GS12090 into Cable Driver Mode, and driving it
LOW will put the GS12090 into Cable EQ mode.
Cable EQ Input – BNC
Trace Driver Output– SMA
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Figure 1-4: Configuration 2 — Cable Driver Mode
1.5 Configuration 3 — Output Balanced Mode
The GS12090 has a feature designed to facilitate reliable Output Return Loss (ORL)
measurements on SDIO while the device is still powered. This mode is called “Balanced
Mode,” which prevents the outputs from toggling while ORL is being measured.
To put the GS12090 Evaluation Board into Balanced Mode, complete one of the two
methods described below, then connect your return loss measurement equipment to
SDIO.
1. Set SW10 to 0010 as described in Step 4 of 1.2.1 Start-up Sequence.
2. Using the GUI, complete the following steps:
a) Set the Input Select Mode to “CSR,” then set Input to Trace EQ. See Figure 2-11:
Main Tab Features Cable Equalizer Mode (6).
b) Navigate to the “Cable” tab in the GUI and click the Enable Balanced Mode
box. See Figure 2-13: Cable Tab (1).
Figure 1-5: Configuration 3 — Output Balanced Mode
Trace EQ Input – SMA
Cable Driver Output – BNC
Cable Driver Output - BNC
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2. Software User Guide
2.1 Installing the GS12090 Software GUI
The GS12090 EBK Setup Wizard is shown in Figure 2-1.
Figure 2-1: Welcome Screen
Click “I accept the agreement” as shown in Figure 2-2, and then click “Next.”
Figure 2-2: License Agreement
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Before continuing with the setup, confirm that you meet the system requirements. Click
“Next.”
Figure 2-3: Software Requirements
Now, select the destination where you would like the software GUI to be installed. Click
“Next.”
Figure 2-4: Select Destination Location
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Next, select the start menu folder. Click “Next.”
Figure 2-5: Select Start Menu
Select if you would like to create a desktop icon (see Figure 2-6), and click “Next.”
Figure 2-6: Select Additional Tasks
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Click “Install.”
Figure 2-7: Ready to Install
Lastly, check “Launch GS12090” and click “Finish” to complete the installation and
launch the GUI.
Figure 2-8: Finish Installation
Note: This application requires Microsoft.NET Framework 4.0 to be installed.
When it is desired to use the Evaluation Board with a GUI interface, it is required that the
Evaluation Board is connected to a PC through the internal USB interface.
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2.2 GUI Operation
2.2.1 Getting Started
Upon launching the GUI you will start at the main tab as shown in Figure 2-9.
To connect the GUI to the evaluation board and begin operation, complete the
following steps.
Note: The numbers found in the brackets refer to Figure 2-9 and are used to show
locations in the GUI.
1. Connect the Evaluation Board to your computer using the supplied USB cable.
2. Press Scan for Dongles (1).
3. Click the dropdown menu to the left of the Scan for Dongles button and select the
EB-GS12090-01 dongle (2).
Now the dongle is connected to the Evaluation Board. To get the current device status
press the Refresh button (3). You may also right click on any area of the GUI to bring up
another Refresh button which may be more accessible.
Additionally, there is an auto refresh function that the GUI can be set to use. This will
auto update the GUI once per second automatically. To enable this, tick the Auto box
that is found to the left of the Refresh button (3).
Figure 2-9: EB-GS12090 Main Tab
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2.2.2 Device Settings Tab
The Device Settings Tab has several items to be noted, they are as follows.
Note: The numbers found in the brackets refer to Figure 2-10 and are used to show
locations in the GUI.
•GPIO Control (3.1)
On this tab you can set each of the 4 x GPIO to an Input or an Output, and set
each of the GPIOs to the desired function via the dropdown menus.
• Save to Flash (3.2)
This function allows the user to add or alter device modes that have been
selected by SW10.
To add or alter a user mode, perform the following:
Note: It is not recommended to alter modes 0000, 0001, 0010 from Table 1-2.
These are default Semtech provided modes and once altered from their default
and saved to flash, resetting or power cycling the device will not restore these
defaults. If a mode creation is desired, it is recommended to use 0011 to 1111
which are the User Configurable modes as per Table 1-2.
1. Set the mode select dip switch (SW10) to the mode number you wish to alter.
2. Configure the GS12090 to the desired settings via the GUI.
3. Click the “CSR Settings” box in the “Save to Flash” box.
4. Click “Save”.
5. Wait for a pop-up box indicating that the mode was saved.
Figure 2-10: Device Settings Tab
2.2.3 Main Tab
The Main Tab has several features for exploring the functionality of the GS12090. Some
notable items are called out in Table 2-1. For a full description of each control, please see
the GS12090 Data Sheet.
3.1
3.2
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Note: The numbers found in the brackets refer to Figure 2-11 and Figure 2-12 and are
used to show locations in the GUI.
Figure 2-11: Main Tab Features Cable Equalizer Mode
Table 2-1: Main Tab Features
Feature (Reference) Description
Input Visualizer (4)
Displays the currently selected signal path and labels the
associated inputs and outputs.
LSC (5)
LSC (Launch Swing Compensation) is used to compensate for
non SMPTE compliant upstream sources. This only needs to be
adjusted if the upstream source is not 800mV.
Note: This control is only applicable to Cable EQ mode.
Input Select (6)
Selects the active input: Cable EQ (BNC input) or Trace EQ (SMA
input).
The Mode Button selects between CSR (immediate) for GUI
control and Pin (immediate) control.
Note: If the evaluation board is set to use pin control, the
actively selected input will be set by the assigned GPIO pin. With
default settings applied, this is GPIO3. Driving GPIO3 HIGH will
put the GS12090 into Cable Driver Mode, and driving it LOW will
put the GS12090 into Cable EQ mode.
Driver Settings (7)
Displays current output state including: disable and mute status,
re-time status, and driver swing settings.
Trace Equalizer Boost (8)
This sets the gain on the Trace Equalizer. The default value is 2.
This value will need to be adjusted based on the insertion loss
profile of the input. See the “Input Trace Equalization” section of
the GS12090 datasheet for more details on boost setting
recommendation.
Note: This control is only applicable to Cable Driver mode.
6
5
4
7
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2.3 Additional GUI Features
2.3.1 Cable Tab
The Cable Tab provides additional settings to control the Cable Equalizer while the
GS12090 is in Cable EQ Mode. For a full description of each control, please see the
GS12090 Data Sheet.
Note: The “Enable Balanced Mode” control should be checked when performing ORL
(Output Return Loss) measurements.
Figure 2-13: Cable Tab
1
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2.3.2 Trace Tab
The Trace Tab provides additional settings to control the Trace Equalizer that is active in
Cable Driver Mode. For a full description of each control, please see the GS12090
Datasheet.
Figure 2-14: Trace Tab
2.3.3 PRBS Tab
The PRBS Tab allows for control over the integrated PRBS7 generator/checker in the
GS12090. The PRBS7 generator/ checker is fully operational in both Cable EQ and Cable
Driver modes. The following is a description of how to use each function.
To use the PRBS Generator:
Note: Where applicable, each of the steps have a bracketed number which refer to their
position in Figure 2-15: PRBS7 Generator.
1. Ensure the Evaluation Board is connected to the GUI.
2. Click the Configure For PRBS Gen button (1).
3. Set the Signal Select to the desired setting from the dropdown menu (3).
4. Set the Clock Source to the desired setting from the dropdown menu (4).
5. Set the Clock Pre-Divider to the desired setting from the dropdown menu (5).
6. Set the Data Rate to the desired setting from the dropdown menu (6).
7. Click the Enable check box (2).
The device will now generate the set PRBS signal on its active output.
Note: If there is no signal present, ensure that the output is not disabled or muted.
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Figure 2-15: PRBS7 Generator
To perform a Continuous PRBS Measurement:
Note: Where applicable, each of the steps have a bracketed number which refer to their
position in Figure 2-16: PRBS7 Checker.
1. Ensure the Evaluation Board is connected to the GUI.
2. Apply a PRBS7 signal to the actively selected input.
3. Set the Measurement Type dropdown menu to “Continuous” (3).
4. Ensure that the Status field reads “Idle (ready for new operation)” (6).
5. Click the Start PRBS Measurement check box to start the measurement (4).
6. When it is desired to stop the measurement, Click the Start PRBS Measurement
check box to stop the measurement (4).
7. Results will appear in the Error Count field (5). The Status field will read “Idle
(ready for new operation)” if the operation was successful.
Note: If the GUI is not set to Auto-Refresh, clicking the Refresh button is required
for the error count to appear.
To perform a Timed PRBS Measurement:
Note: Where applicable, each of the steps have a bracketed number which refers to
their position in Figure 2-16: PRBS7 Checker.
1. Ensure the Evaluation Board is connected to the GUI.
2. Apply a PRBS7 signal to the actively selected input.
3. Set the Measurement Type dropdown menu to “Timed” (3).
4. Set the Measurement Timer Pre-Divider and Measurement Interval to the
appropriate values to get the desired measurement time (1) (2).
Note: To determine the measurement time set by Measurement Timer
Pre-Divider and Measurement Interval see
Equation 2-1 . The maximum time the
PRBS Checker can be set to is approximately 3.35 seconds.
5. Ensure that the Status field reads “Idle (ready for new operation)” (6).
6. Click the Start PRBS Measurement check box to start the measurement (4).
1
2
3
4
5
6
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7. Once the measurement is complete the Status field will read “Timed operation
completed (success)” (6).
Note: If the GUI is not set to Auto-Refresh, clicking the Refresh button is required
for this message to appear.
8. Results will appear in Error Count field (5).
9. Click the Start PRBS Measurement check box to remove the checkmark. This
prepares the PRBS Checker for its next measurement (4).
Equation 2-1
Figure 2-16: PRBS7 Checker
2.3.4 Eye Monitor
The GS12090 is capable of creating an eye diagram to display the input signal on both
the Cable Equalizer and Trace Equalizer Inputs.
There are two eye monitor modes to choose from that allow for different functionality.
These functions are “Shape Scan” and “Full Eye Scan”. The Shape Scan, and the Full Eye
Scan do not interrupt or interfere with the active functions of the GS12090.
The sections below will describe how to use of these functions. Further information on
each can be found in the GS12090 Data Sheet.
2.3.4.1 Shape Scan
The Shape Scan returns the 4 outer most points of the equalized input signal which can
be used to quickly and easily calculate the eye height and width of the equalized input
signal.
The speed of this scan lends extremely well to allowing applications to quickly check the
shape of the input eye and adjust their system accordingly. To demonstrate one
potential use of this feature, the GS12090 GUI has an integrated Trace EQ optimization
routine. This uses Shape Scan feature to assess the current shape of the equalized input
signal and adjusts the Trace EQ to an optimal level.
MeasurementTime SecondsMeasurementTimerPreDivider
MeasurementInterval 256 1+
1
40
------
MHz
=
/
