VB2934 - 1

2

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

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

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.