GENLINX
™
II
EB-RD35 Evaluation Board
PRELIMINARY
INTRODUCTION
The EB-RD35 is an evaluation and reference design
platform for Routing and Distribution applications using the
GENLINX
™
II
GS9024 Equalizer, the GS9035 Reclocker,
and the GS9028 Cable Driver.
CIRCUIT DESCRIPTION
A functional block diagram is shown below and illustrates
the primary circuit functions. These include equalization,
reclocking, and driving 75Ω co-axial cables. A complete
schematic is also included.
The EB-RD35 accepts a serial digital data input signal
which first goes into the GS9024 equalizer. Equalization
of the input signal is completely automatic for signal
attenuation due to cable length from 0dB to in excess of
30dB. The signal strength/carrier detect output of the
equalizer, which is proportional to the amount of equalization
taking place, is available via test point TP3. Also available
as an output, is the equalizer "Output Eye Monitor" signal
via a SMA connector (J6). The signal strength/carrier
detect and Output Eye Monitor are useful diagnostic
outputs.
After equalization, the differential data signal is passed
to the GS9035 reclocker which generates clock and
retimed data signals. In addition, the complementary
serial clock output signals are available at BNC connectors
J2 and J3. The GS9035 also drives data rate indication
LEDs and a LOCK LED which is provided to visually
indicate when the reclocker has locked to the incoming
video signal.
The reclocked data signals are then supplied to the
GS9028 cable driver which provides two complementary
data outputs at BNC connectors J4 and J5. The GS9028
is configured to drive 75Ω co-axial cables with SMPTE
defined 800mV levels.
BOARD SET-UP AND TEST
The board is configured in SMPTE, auto-tune mode and
supports five data rates: 143Mb/s, 177Mb/s, 270Mb/s,
360Mb/s, and 540Mb/s. LED indicators are used to indicate
when the device is LOCKed and the detected data rate as
shown below:
SS2
0
0
0
0
1
SS1
0
0
1
1
0
SS0
0
1
0
1
0
143Mb/s
177Mb/s
270Mb/s
360Mb/s
540Mb/s
The GS9035 can also be configured for manual mode by
first putting the AUTO/MANUAL jumper (JMP2) into the 2-
3 position. Then jumpers JMP[7:5] are set accordingly.
Note that whenever the AUTO/MANUAL input of the GS9035
is HIGH (auto mode), jumpers JMP[7:5] should be left
floating to avoid bus contention.
SERIAL
DATA
INPUT
GS9024
EQUALIZER
GS9035
RECLOCKER
GS9028
CABLE
DRIVER
SERIAL
DATA
OUTPUTS
SERIAL
CLOCK
OUTPUTS
EB-RD35 BLOCK DIAGRAM
Document No. VB2930 - 1
1
GENNUM [ GENNUM CORPORATION ]
