SAA7158 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

SAA7158

Back END IC

Philips Electronics 

Philips Semiconductors

Back END IC

Preliminary specification

SAA7158

FUNCTIONAL DESCRIPTION

Block Diagram

The BENDIC will be produced in a CMOS double metal process. It is possible to feed the BENDIC with 8-bit wide

luminance and chrominance signals Y/U/V in 4:1:1 mode from the digital Y/U/V bus and to run it in a bypass mode with

Y/U/V in 4:4:4 mode without any bandwidth reduction.

The BENDIC contains the processing functions as depicted in Fig.3.

Following functions are available:

Datapath:

• 1H - 4:1:1 line memory, 852 words by 8-bits luminance + 4-bits multiplexed chrominance

• REFORMATTER to get 8-bit wide UV from the Y/U/V bus format

• MIX UV and MIX Y to interpolate between actual and 1H-delayed input signals, programmable for realization of vertical

zoom

• MEDIAN filter in luminance processing path for line flicker reduction

• MOVIE PHASE DETECT for supporting line flicker reduction control

• PEAKING for luminance channel

• UPSAMPLING and DCTI for chrominance transient improvement

• HOLD/GREY/BLANK blocks for blanking and grey level insertion

• RE PROCESSING controls read enable for first and second memory, outputs are programmable for different

applications

• Data switches for field select, mix/median select, 4:1:1/4:4:4 select

• DAC blocks for digital to analog conversion of Y, U, V video signals

• REGISTER with 3-state control for direct output of Y/U/V 1 input to memories.

Control:

• µP INTERFACE for the control of BENDIC functions, including zoom control

• TIMING CONTROL and TEST as support blocks.

All video data signal processing inside the BENDIC is phaselinear and nonrecursive (except line delay in recirculation

mode).

July 1994

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