GENNUM EB9021

GENLINX™ II
EB9021 Evaluation Board
PRELIMINARY
INTRODUCTION
A PLD is provided primarily to interface to the Flag Port of the
GS9021 and extract the Ancillary, Full Field, and Active
Picture error flags. The PLD is designed to cycle the S[1:0]
inputs of the GS9021, read and demultiplex the output error
flags, and drive the EDH LEDs providing visual indication of
the type of EDH errors present. The PLD is also designed to
control which error flags are read from the GS9021 Flag Port
— incoming or outgoing. Upon power-up or RESET, the
board is configured to display the outgoing EDH error flags.
When the INC. FLAGS push-button is depressed, the PLD
writes to the GS9021 flag port instructing it to output the
incoming EDH error flags instead. To return to the outgoing
error flags, the system must be RESET. Finally, the PLD is
used to buffer the GS9021 field, vertical, and horizontal
output signals and drive the respective LEDs.
The EB9021 is an evaluation and reference design platform
for the GENLINX™ II GS9021 EDH Coprocessor. The
EB9021 is a parallel ECL input, parallel ECL output board
that fully supports Error Detection and Handling (EDH)
according to SMPTE RP165. The board operates to 54MHz
and supports the following standards:
- 4:2:2 Component with 13.5 MHz Y sampling (NTSC & PAL)
- 4:2:2 Component with 18.0 MHz Y sampling (NTSC & PAL)
- 4fsc Composite (NTSC & PAL)
- 4:4:4:4 Component Single Link with 13.5 MHz Y sampling
(NTSC & PAL)
CIRCUIT DESCRIPTION
A block diagram of the board is shown below and illustrates
the primary circuit functions. A full schematic is also included.
A DB9F connector is provided for access to the I2C interface
of the GS9021. I2C slave address bits are set via configuration
jumpers. For a detailed description of the GS9021 I2C
interface refer to the GS9021 data sheet.
Bit parallel data is connected to the board through a DB25F
connector with a pin configuration in accordance with SMPTE
125 and SMPTE 244M. Three 10125 ECL to TTL converter
ICs are used to shift the logic levels of the bit parallel data to
directly interface with the GS9021 EDH Coprocessor. The
resulting CMOS (TTL compatible) outputs of the GS9021 are
supplied to three 10124 TTL to ECL converter ICs. These
ECL outputs are then available at the output DB25F connector.
CONFIGURATION JUMPERS
PARALLEL
DATA
IN
ECL
TO
TTL
GS9021
EDH
COPROCESSOR
TTL
TO
ECL
PARALLEL
DATA
OUT
DB25F
DB25F
EDH & FVH LEDs
I2C INTERFACE
PLD
EB9021 BLOCK DIAGRAM
I 2C is a registered Trademark of Philips
Document No. VB2934 - 1
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Finally, configuration jumpers are provided for further
configuration of the GS9021. A detailed description of the
input and output pins of the GS9021 can be found in the
GS9021 data sheet.
BOARD SET-UP AND TEST
Upon power-up or RESET, the GS9021 is configured for auto
standards detection of any of the supported video standards.
The GS9021 can also be configured for manual standards
detection by setting the STD[3:0], STD_SEL, and S bits of the
HOSTIF write table appropriately via the I2C interface.
To verify operation of the EB9021, a source of parallel digital
video should be applied to the input DB25F connector. The
output data stream available at the DB25F output connector
can be supplied to a D to A converter for verification via a
monitor. Note that the following configuration signals must
be set as shown for an output to be present:
BLANK_EN = HIGH (blanking disabled )
LSB_TOP = LOW (output data bus is not reversed)
The power supply requirements for the EB9021 are +5V for
VCC at a current rating of 300mA and -5V for VEE at a
current rating of 415mA (nominally).
PCB DETAILS
The EB9021 is a four layer printed circuit board constructed
of standard FR-4 material and measures approximately 6 "
by 4.5". Ground and power plane layers are internal to the
board with signal layers on the top and bottom of the board.
Components are mounted on the top side. The silk-screen
(top) and the top and bottom layers are shown on the
following pages.
APPLICATIONS
The EB9021 evaluation board is designed to allow evaluation
and testing of the GS9021 EDH Coprocessor. The board can
also be used in stand alone applications where it is necessary
to test the performance of a system. In this application, the
EB9021 provides visual indication of system errors as well as
detailed error reporting via the I2C interface.
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
Please be advised that this preliminary document does not conform to Gennum's ISO9001 standards.
© Copyright March 1998 Gennum Corporation. All rights reserved. Printed in Canada.
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