EB-GS2985-S
Evaluation Board User Guide
52246 - 2
July 2009
4 of 25
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 75
Ω
coaxial cable, and the
GS2988 is designed to drive one to two 75
Ω
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.
Block Diagram of the EB-GS2985-S
GS
2984
GS
2988
GS
2985
S
MA
Optim iz e
d
IRL
Optim iz e
d
ORL
DDO0
DDO1/R
C
O
DDI0
S
P I Interfa
c
e
BN
C
BN
C
BN
C
R
C
LK
C
TRL
S
MA
LE Ds
EQ
C
TRL
C
D
C
TRL
Power
S
upplies
EQ
R
C
LK
C
D
C
D_TERM
