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AL128 Data Sheets
AL128
Contents
1.0 Features ________________________ 3
9.0 Board Design and Layout
Considerations ______________________40
9.1 Grounding _______________________ 40
9.2 Power Planes_____________________ 40
9.3 Power Supply Decoupling __________ 40
9.4 Digital Signal and Clock Interconnect
2.0 Applications _____________________ 4
3.0 General Description _______________ 4
4.0 Pinout Diagram __________________ 5
5.0 Pin Definition and Description ______ 6
6.0 Functional Description ___________ 12
40
9.5 Analog Signal Interconnect _________ 41
9.6 Component Placement _____________ 41
10.0 Mechanical Drawing _____________42
11.0 Power Consumption______________44
6.1 Input Interface ___________________ 12
6.1.1 24-bit RGB_______________________ 13
6.1.2 VAFC___________________________ 13
6.1.3 Feature Connector _________________ 14
6.1.4 Sampling (Pixel) Clock _____________ 14
6.2 Hardware and Software Control Modes
___________________________________ 15
6.3 Video Timing ____________________ 15
6.4 Supported Resolutions _____________ 17
6.5 Flicker Filter _____________________ 18
6.6 Overscan/Underscan Control _______ 18
6.7 Pan and Position Control ___________ 18
6.8 Zoom Feature ____________________ 18
6.9 Frame Buffer Management _________ 19
6.10 Digital Video Encoder ____________ 19
6.11 Push Button Interface/OSD ________ 19
6.12 Memory Control Timing __________ 20
6.13 I
2
C Programming ________________ 23
7.0 Electrical Characteristics __________ 26
7.1 Recommended Operating Conditions _ 26
7.2 Characteristics ___________________ 26
8.0 AL128 Register Definition _________ 27
8.1 Index of the Control Registers_______ 27
8.2 Control Register Description________ 28
8.3 AL128 Plug & Play Hardware Table _ 38
2
April 2, 1999
AL128
AL128
Plug and Play VGA to NTSC/PAL Converter
1.0 Features
•
Zoom and freeze controls
•
Four-touch-button interface with on-screen-
menu (on TV) to control all key functions
•
Horizontal and vertical position centering
control
•
Optional digital 24-bit RGB/VAFC interface
for best quality
•
Power down feature controlled by software or
hardware
•
Full programmability via I
2
C interface
•
Picture panning control
•
Brightness control
•
Built-in color bar
•
Simultaneous display on PC and TV monitors
•
Single 5-volt support
•
Thin, small LQFP package for PCMCIA or
notebooks. 28x28 PQFP available upon request
•
Convert non-interlaced VGA or Macintosh
video into interlaced TV format (NTSC/PAL)
•
Analog RGB output for SCART interface
•
Highly integrated design with built-in
NTSC/PAL encoder, ADC, DAC and SRAM
•
Broadcast TV quality
•
High clarity 5-line anti-flicker filter
•
8 levels of sharpness control
•
Plug and play with no need for software or
micro-controller
•
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
Field Memory
Memory
Management
Unit
Memory
Configuration
Setup
ADEN
Digital R, G, B
9-bit
DAC
ACMP / R
AY / G
Digital
Video
Processor
Digital
TV
Encoder
8-bit
ADC
9-bit
DAC
9-bit
DAC
R
G
MUX
8-bit
ADC
8-bit
ADC
AC / B
B
RSET
VREF
COMP
VRT
VRB
Video
Memory
GCLK
I
2
C
Interface
GHSDIV
Timing
Generating
Push Button
Interface
GHSYNC
GVSYNC
AL128-01
3
April 2, 1999
AL128
2.0 Applications
PC ready multimedia TV
TV output for laptop, network, entertainment PC
Net browser/set-top box
Internet TV
VGA add-on card with TV output
VGA to TV converter box
3.0 General Description
The AL128 PC to TV scan converter chip
accepts graphic data up to 1024x768
resolution from PC and Macintosh graphics
controllers and converts it into broadcast-
quality NTSC or PAL TV signals. In addition
to analog RGB, 24-bit digital RGB data can
be input to maintain the best video quality and
avoid noise problems. This new chip is pin-to-
pin compatible with the AverLogic AL100 but
provides analog RGB output for SCART
implementation.
The major functions of the AL128 can be
accessed using four push buttons combined
with the on-screen-menu feature, eliminating
the cost of a micro-controller and complex
control panel. The superior quality scaling
algorithm, which reduces the jagged-edge
artifacts from line dropping, can smoothly fit
graphics of 640x480 (up to 100 Hz) and
1024x768 (up to 75Hz) resolutions into the
visible region of the NTSC or PAL screen.
Both horizontal and vertical sizes can be
linearly adjusted. Additional features include
eight levels of flicker control using 5-line
filter, zoom control and picture freeze.
An integrated high-quality anti-flicker filter
(SmartFilter ) removes the unpleasant
flicker caused by the interlaced display of high
contrast graphics while maintaining the
original clarity and sharpness of informative
data such as natural pictures and text.
This highly integrated mix-signal chip,
packaged in 24mm x 24mm 160-pin LQFP
(low quad flat package), is powered by a
single 5-volt power supply. Power-down is
achieved by using either hardware or software
control.
With 512Kbytes of memory, plug-and-play is
achieved by automatically detecting the scan
rate and resolution of the incoming graphic
signals without the use of software. With less
memory than other solutions on the market,
high resolution data is processed and stored by
using a complex and proprietary buffer
management system. No compromise is made
at all with video quality by using either
compression or sub-sampling algorithms.
The enhanced features and superior quality
make the AL128 very suitable for PC video to
TV conversion in PC ready multimedia TV’s,
scan converter boxes, VGA add-on cards,
Web TVs, or network / laptop PCs.
4
April 2, 1999
AL128
4.0 Pinout Diagram
121
80
BLUE5
MD7
122
79
BLUE4
VDD
123
78
VDD
MWENL
124
77
BLUE3
MWENH
125
76
BLUE2
MEMCONF0
126
75
BLUE1
MEMCONF1
127
74
BLUE0
GND
128
73
ADGND
MWCLK
129
72
AB
MEMTYPE
130
71
ADVDD
MWRST
131
70
ADVDD
VDD
132
69
AG
MRRST
133
68
ADGND
MRCLK
134
67
VRT
GND
135
66
VRB
MREN
136
65
ADGND
MQ8
137
AL128
64
AR
MQ9
138
63
ADVDD
MQ10
139
62
VDD
MQ11
140
61
GHSYNC
VDD
141
60
GVSYNC
MQ12
142
59
GND
MQ13
143
58
GCLK
MQ14
144
57
VDD
MQ15
145
56
GHSOUT
GND
146
55
GHSDIV
MD8
147
54
GVSOUT
MD9
148
53
/PWRDN
MD10
149
52
/RESET
MD11
150
51
VDD
GND
151
50
TVCLK
MD12
152
49
CLKTYPE
MD13
153
48
XOUT2
MD14
154
47
XIN2
MD15
155
46
GND
VDD
156
45
INTYPE1
DAVDD
157
44
INTYPE0
DAVDD
158
43
XOUT1
COMP
159
42
XIN1
RSET
160
41
GND
ACMP/
ROUT
5
April 2, 1999
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