Averlogic AL251A-EVB-A0 User manual

©2006 Copyright by AverLogic Technologies, Corp.
AL251A-EVB-A0
Scan Converter
Evaluation Board
User Manual
Version 1.0
INFORMATION FURNISHED BY AVERLOGIC IS BELIEVED TO BE
ACCURATE AND RELIABLE. HOWEVER, NO RESPONSIBILITY IS
ASSUMED BY AVERLOGIC FOR ITS USE, NOR FOR ANY
INFRINGEMENTS OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES
THAT MAY RESULT FROM ITS USE. NO LICENSE IS GRANTED BY
IMPLICATION OR OTHERWISE UNDER ANY PATENT OR PATENT OR
PATENT RIGHTS OF AVERLOGIC.
Document Number: 1-M-PAE351-0001

©2006 Copyright by AverLogic Technologies, Corp.
Amendments: (Since June 27, 2006)
2006.06.27 version 1.0
Disclaimer
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PRODUCTS HERIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN.
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APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED
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CUSTOMERS ARE ADVISED TO CONSULT WITH AVERLOGIC OR ITS
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©2006 Copyright by AverLogic Technologies, Corp.
TABLE OF CONTENTS
1. Introduction...............................................................................................................................................1
1.1. Introduction ...............................................................................................................................1
1.2. Product Overview......................................................................................................................1
1.2.1. AL128.................................................................................................................................1
1.2.2. AL251.................................................................................................................................1
2. Hardware Section ......................................................................................................................................2
2.1. Contents of EVB Kit..................................................................................................................2
2.2. Hardware Installation ................................................................................................................3
2.2.1. VGA TO TV Signal Hardware Installation .........................................................................3
2.2.2. TV Signal TO VGA Hardware Installation .........................................................................3
2.3. Block Diagram and Settings......................................................................................................3
2.3.1. Block Diagram...................................................................................................................3
2.3.2. Connector Descriptions .....................................................................................................4
2.3.3. Button Descriptions.............................................................................................................4
2.3.4. LED Descriptions ................................................................................................................5
2.4. OSD Operation..........................................................................................................................5
2.4.1. AL128 OSD OPERATION .................................................................................................5
2.4.2. AL251 OSD OPERATION .................................................................................................5

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 1
1. Introduction
1.1. Introduction
The AL251A-EVB-A0 is an engineering evaluation board that is used to
evaluate and demonstrate the performance of the AL128 VGA to TV scan
converter chip and AL251 TV to VGA scan converter chip. The board contains
two 3M bits of field memory (AL422B) for AL128, and one video decoder
(AL242) for AL251. An attached 80C51 microcontroller is used to control AL242
and AL251 via 2-wire Serial Bus.
The evaluation board accepts VGA analog signals or analog video signals.
AL128 converts the analog VGA signal into NTSC/PAL S-video and composite
video (CVBS), or analog RGB for SCART application. Additional bypass VGA
output could be added via the video buffer. This implementation can display at
both the monitor and TV simultaneously. Through AL251 and AL242, it accepts
NTSC/PAL S-video or composite video (CVBS) and converts into VGA analog
signal output or 16-bits digital RGB/YUV output.
Various switches and buttons are designed in the evaluation board for ease of
demonstrating and testing the functions. For detailed descriptions of each
connector, button and LED, please refer to “Block diagram and settings” section.
The board uses an external DC power adaptor (+12V/1A).
1.2. Product Overview
1.2.1. AL128
!Converts non-interlaced VGA into interlaced TV format (NTSC/PAL)
!
Composite video and S-Video outputs
!Analog RGB output for SCART interface
!Highly integrated design with built-in NTSC/PAL encoder, ADC, DAC and SRAM
!High clarity 5-line anti-flicker filter
!8 levels of sharpness control
!Supports up to full 1024x768 VGA resolution
!Automatically supports scan rate from 50 Hz up to 100 Hz
!Linear vertical and horizontal overscan/underscan control
!Zoom and freeze controls
!Four-touch-button interface with OSD (on TV) to control all key functions
!Picture panning control
!Brightness control
!Built-in color bar
!Simultaneously displays on PC and TV monitors
1.2.2. AL251
!Converts interlaced TV signal (NTSC/PAL) into non-interlaced RGB format for
CRT monitorsor LCD panels
!Highly integrated design with built-in DAC,SRAM, OSD and LUT
!Built-in on-screen-display with programmable bitmap
!Auto NTSC/PAL detection
!Analog/digital non-interlaced RGB (VGA) signal output (Scan Doubled or

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 2
Deinterlaced)
!Internal RGB video lookup table (LUT) to provide gamma correction and
special effects
!Overlay support for title making and complex on-screen display
! 16-bit digital RGB/YUV output
2. Hardware Section
2.1. Contents of EVB Kit
!EVB Board X 1
!Power
Adapter X 1
!VGA Cable X 1
!RCA Cable X 1
!S-video Cable X 1
!Quick Setup Guide X 1
AL- 128B-T-0
AL- 251A- T- 0
D4
D3
D2
D1
PowerJack
DC-12V
PowerSwitch
S8/ SELECT215/128
S9/LUT
S10/ BORDER
S2/ RST MCU
S7/AV/SV
S6/MENU
S5/SELECT
S4/DEC
S3/INC
S16/MENU
S17/SELECT
S18/DEC
S/19INC
S12/ RST128 S- VIDEO
CVBS
S13
S15
S14 JP3
S11
JP6
JP7
JP4
1
2
3
MCU
VGA
INPUT
VGA OUTPUT
ON
OFF

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 3
2.2. Hardware Installation
2.2.1. VGA TO TV Signal Hardware Installation
1) Connects RCA cable or S-Video cable between the EVB and TV
2) Connects VGA cable between the VGA output jack of EVB and the video signal
source
3) Connects the power supply plug
2.2.2. TV Signal TO VGA Hardware Installation
1) Connects RCA cable or S-Video cable between the EVB and the video signal
source
2) Connects VGA cable between the VGA output jack of EVB and VGA monitor
3) Connects the power supply plug
2.3. Block Diagram and Settings
2.3.1. Block Diagram
TV
Output
Video
Input
PLL
VGA
in
VGA
out
PC VGA
output
VGA
monitor
GVSYNC
GHS/GVS R,G,B
GCLK
AL422Bx2
AL128
MD MQ Control
GHSYNC
Y
C
Comp
RGB
12V
AL251
Push
Button
Micro-
controller
I
2
C Bus
Y
C
Comp
AL242
Decoder
16-bit
YUV
HS/VS
I
2
C Bus Push
Button
Digital RGB
AL128 (in)
AL251 (out)

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 4
2.3.2. Connector Descriptions
Reference Description
J1 Composite Video (CVBS) Input/Output
J2 VGA Output
J3 VGA Input
J4 Power Jack
JP1 Digital Video (16-bits RGB/YUV or 24-bits RGB MSB Bits)
Input/Output
JP2 Backlight Controller Interface
JP3 AL128
2-wire Serial Bus Interface
JP4 AL251
2-wire Serial Bus Interface
JP5 24-bits Digital RGB LSB Interface
JP6 Analog RGB Output
CON1 S-Video Input/Output
2.3.3. Button Descriptions
Reference Description
S1 Backlight controller switch
S2 Micro-controller reset button
S3 AL251 INCREASE button
S4 AL251 DECREASE button
S5 AL251 SELECT button
S6 AL251 MENU button
S7 AL251 input video source switch button (composite video and
S-video)
S8 AL251 BORDER button
S9 AL251 LUT (Gamma correction) button
S10 AL128/AL251 Select button
S11
AL128 RSET pull-down resistance select
"150 ohm pull-down for RGB output
"90 ohm pull-down for Y/C/Composite output
S12 AL128 Reset button
S13 AL128
RGB/YC select
S14
2-wire serial bus or Vsync Programming
S15
NTSC/PAL output select
S16 AL128 MENU button
S17 AL128 SELECT button
S18 AL128 INCREASE button
S19 AL128 DECREASE button

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 5
2.3.4. LED Descriptions
Reference Description
D1 Program status indicator
D2 AL128 selected indicator (VGA to TV signal)
D3 AL251 selected indicator (TV signal to VGA)
D4 Power on indicator (Red LED)
2.4. OSD Operation
2.4.1. AL128 OSD OPERATION
1) To pop up the on screen menu, press the [AL128_Menu] button
2) To select a control function, use [AL128_Increase] or [AL128_Decrease]
button to scroll to it, then press [AL128_Select] button
3) After selecting a control function, use [AL128_Select], [AL128_Increase] or
[AL128_Decrease] button to adjust the control settings
4) To exit the on screen menu, press [AL128_Menu] again
2.4.2. AL251 OSD OPERATION
1) To select AL251 channel, press the [AL251/128 Select] button
2) To select the video source between composite video and S-video, press the
[AL251_Source] button
3) To pop up the Brightness setting menu on screen, press the [AL251_Menu]
button
4) Use [AL251_Increase] or [AL251_Decrease] button to adjust the brightness
effects
5) To adjust other settings, press the [AL251_Select] button
6) Use [AL251_Increase] or [AL251_Decrease] button to adjust these control
effects
7) To exit the on screen menu, press [AL251_Menu] again
8) You can use the [AL251_LUT] button to add the gamma correction table

©2006 Copyright by AverLogic Technologies, Corp. Version 1.0 6
ONTACT INFORMATION
AverLogic Technologies, Corp.
URL: http://www.averlogic.com