Version
2
ECR
152337
Date
July 2009
Changes and / or Modifications
Updates to Sections
1.9.4 GS2985 Control
Software, 2. Schematics
and
4. Bill of
Materials.
Added Section
Pin Override
Functionality.
Changed inductor value in Section
2.1
EB-GS2985-S Schematic
and Section
4. Bill of
Materials.
Modified Section
1.8 Measuring
ORL.
New document.
1
152007
June 2009
0
151624
May 2009
Contents
General Description ..........................................................................................................................................3
Evaluation Kit Contents ...................................................................................................................................3
Overview ..............................................................................................................................................................4
1. Evaluation Board User Guide ....................................................................................................................5
1.1 SDI Inputs and Outputs ..................................................................................................................6
1.2 DDO1/RCO Output ..........................................................................................................................6
1.3 SPI Interface .......................................................................................................................................6
1.4 GS2985 RCLK Control I/O ..............................................................................................................6
1.5 GS2984 EQ Control I/O ...................................................................................................................7
1.6 GS2988 CD Control I/O ..................................................................................................................8
1.7 Power Pins ...........................................................................................................................................9
1.8 Measuring ORL ............................................................................................................................... 11
1.9 Board & Software Setup Instructions ...................................................................................... 11
1.9.1 Installing the Gennum USB Dongle Board Software ............................................. 11
1.9.2 Installing the GS2985 Control Software..................................................................... 13
1.9.3 Setting Up the Hardware ................................................................................................ 16
1.9.4 GS2985 Control Software ............................................................................................... 17
Functionality of Buttons ............................................................................................................................... 18
Functionality of Knobs .................................................................................................................................. 18
Pin Override Functionality .......................................................................................................................... 19
1.9.5 Start-up Process ................................................................................................................. 19
1.10 Optional Connectors .................................................................................................................. 19
2. Schematics .................................................................................................................................................... 20
2.1 EB-GS2985-S Schematic .............................................................................................................. 20
2.2 Power & Control Schematic ....................................................................................................... 21
3. Board Layout................................................................................................................................................ 22
4. Bill of Materials............................................................................................................................................ 23
EB-GS2985-S
Evaluation Board User Guide
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General Description
The GS2985-S evaluation package is designed to accelerate the evaluation process of the
GS2985 Multi-rate SDI Reclocker with Equalization and De-emphasis.
It is strongly recommended to read the GS2985 Data Sheet (Doc ID: 36663_DocX.pdf)
before using this evaluation kit.
Evaluation Kit Contents
•
•
•
Gennum EB-GS2985-S Evaluation Board
Gennum USB Dongle with Ribbon Cable
CD containing GS2985 Evaluation Software, Drivers and Collateral
EB-GS2985-S
Evaluation Board User Guide
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Overview
Together with the EB-GS2985-S (single-channel) Evaluation Board, this document
serves as a guide for evaluating the GS2985, a Gennum 3Gb/s, HD, SD SDI serial digital
reclocker. This document contains four main sections:
1. Evaluation Board User Guide.
2. Evaluation Board Schematics.
3. Evaluation Board Layout.
4. Evaluation Board Bill of Materials
The figure below shows a block diagram of the features and the functions of the
EB-GS2985-S.
The purpose of the EB-GS2985-S single-channel evaluation board is to evaluate the
GS2985 3G Video Reclocker (RCLK). It also features the GS2984 3G Equalizer (EQ) and
the GS2988 3G Cable Driver (CD). The GS2985 is designed to automatically recover the
embedded clock from a SMPTE-424M, SMPTE 292M, or SMPTE 259-C compliant digital
video signal, and re-time the incoming video data.
The GS2984 and the GS2988 are high-speed BiCMOS integrated circuits. The GS2984 is
designed to equalize and restore signals received over 75Ω coaxial cable, and the
GS2988 is designed to drive one to two 75Ω coaxial cables.
The EB-GS2985-S also provides access to the GS2985’s internal registers via SPI. A
Gennum SPI dongle is included in the kit, to communicate with the GS2985 through a
USB connection.
Power
Supplies
EQ
RCLK
CD
CD_TERM
S
P I Interface
EQ
CTRL
CD CTRL
Optim iz ed IRL
Optim iz ed ORL
BNC
BNC
GS2984
DDI0
GS2985
DDO0
GS2988
BNC
DDO1/RCO
RCLK
CTRL
LE Ds
SMA
Block Diagram of the EB-GS2985-S
SMA
EB-GS2985-S
Evaluation Board User Guide
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July 2009
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