Introduction

The AL244C-EVB-A0 & AL244C-EVB-A1evaluation boards are designed to demonstrate the capabilities of AverLogic’s AL244 chip, which is a high quality 4-in-1 video decoder. The AL244 combines four stand alone multistandard video decoders and includes 2D Comb filter for high level video surveillance applications.

These boards support CVBS, S-video and Component inputs. It decodes NTSC/ PAL/ SECAM from this input interface and converts it into YCbCr 4:2:2 or RGB- 565 digital video data through the programmable data bus.

These EVBs combine the AverLogic AL244 Decoder with the Philips SAA7105 Encoder. The input interfaces include four CVBS interfaces, two S-Video interfaces and one component interface. It also provides CVBS and S-Video output interfaces. The digital interface has an additional feature that allows it to interface through the AL244 decoder kernel.

The AL244C-EVB-A0 uses the AL244C-LF2-PBF chip (80-pin version, 10x10 mm).

The AL244C-EVB-A1 uses the AL244C-LF1-PBF chip (128-pin version - 14x14 mm).

Applications for the AL244

• Video Surveillance System
• Video Editing System

Key Features of the AL244

Analog Input

• Four 10-bit ADC, AGC & ACC (Automatic Clamping Control)
• Supports Auto Multi-Standard NTSC/PAL/SECAM mode detection
• Supports Weak & Non-Standard Signal mode detection
• Adaptive 2D Comb-Filter video decoding for Y/C separation

Digital video output

• • Supports four digital ITU-R 656 8-bit outputs with four-video-decoder mode.
• Supports two ITU-R 601 16-bit outputs with two-video-decoder mode.
• Supports RGB 565 16-bit output with two-video-decoder mode.

Video Processing

• Closed Caption/V-Chip/WSS/WSS-J VBI decoding.

4-Decoder Mode (A,B,C and D)

• 4 analog CVBS inputs for each of the four video decoders
• Standard ITU-R BT 656 format 8-bit outputs
• 4 RTSO (Real Time Status Output) signals for each of the 4 video decoders
• 2 Fast Channel-Switching I/O’s for each decoder

2-Decoder Mode ( AB and CD)

• Each of the 2 video decoders support S-Video and Component inputs
• Standard ITU-R BT 656 format 8-bit outputs
• Standard ITU-R BT 601 format 16-bit outputs
• Digital RGB output ( 8-bit for Green channel,6-bit for Red and Blue Channels )
• 4 RTSO (Real Time Status Output) signals for each of the 2 video decoders

Miscellaneous

• 1.8V core logic. 3.3V I/O with 5V tolerance
• Controlled via 2-wire serial-bus interface. All 4 video decoders require only one serial bus and
  share one slave address
• Requires only one crystal for all 4 video decoders
• Supports interrupt output pin for hardware mode detection
• Built-in Test Pattern Generator
• Low power consumption
• Small-size and Lead Free Package
  LQFP-128 (14x14mm) and LQFP-80 (10x10mm)