GENLINX
™
II
EB9035 Evaluation Board
PRELIMINARY
INTRODUCTION
The EB9035 is an evaluation and reference design platform
for the
GENLINX
™
II
GS9035 Reclocker and the GS9028
Cable Driver.
CIRCUIT DESCRIPTION
A functional block diagram is shown below and illustrates
the primary circuit functions. These include reclocking and
driving 75Ω co-axial cables. A complete schematic is also
included.
The EB9035 accepts differential serial digital data input
signals which go into the GS9035 reclocker. The reclocker
then 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 (JMP1) 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.
To verify operation of the EB9035, a differential source of
serial digital video should be applied to the input BNC
connectors using 75Ω co-axial cable. A convenient differ-
ential source is available from the EB9024 evaluation
board. The output data stream is available at the serial
output and can be supplied to a D to A converter for
verification via a monitor. Note that the jumpers should be
set as shown below for an output to be present:
JMP1: 1-2 (reclocker configured for AUTO mode)
JMP2: 1-2 (reclocker configured for SMPTE mode)
DIFFERENTIAL
SERIAL DATA
INPUTS
GS9035
RECLOCKER
GS9028
CABLE
DRIVER
SERIAL
DATA
OUTPUTS
SERIAL
CLOCK
OUTPUTS
EB9035 BLOCK DIAGRAM
Document No. VB2931 -1
1
GENNUM [ GENNUM CORPORATION ]
