HMP8154 datasheet(19/34 Pages) INTERSIL

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TABLE 14. VIDEO PROCESSING REGISTER

SUB ADDRESS = 03H

BIT

NUMBER

FUNCTION

DESCRIPTION

RESET

STATE

Luminance

Processing

0 = None

1 = Y Lowpass filtering enabled

Composite Video

Limiting

0 = None

1 = Lower limit of composite active video is about half the sync height

SCH Phase

Mode

0 = Never reset SCH phase

1 = Reset SCH phase every 4 (NTSC) or 8 (PAL) fields

RGB Pedestal En-

able

0 = Don’t add blanking pedestal to RGB output

1 = add blanking pedestal to RGB output

RGB pin Assignment

select

0 = use HMP8156 assignments

1 = SCART connector compatible

First Active

Line Select

This bit is ignored unless flicker filtering is enabled. This bit is ignored on the HMP8156.

0 = First line of active video in odd fields is on an odd line number

1 = First line of active video in odd fields is on an even line number

1-0

Flicker Filter

Processing

These bits must be “00” during 8-bit YCbCr and BT.656 input modes, and SIF input resolution

mode. These bits are always “00” on the HMP8156A.

00 = No flicker filtering

01 = reserved

10 = reserved

11 = 3-line flicker filtering enabled

00B

TABLE 15. TIMING I/O REGISTER #1

SUB ADDRESS = 04H

BIT

NUMBER

FUNCTION

DESCRIPTION

RESET

STATE

BLANK

Timing Select

This bit is ignored unless BLANK is configured to be an output.

0 = Data for the first active pixel of the scan line must arrive the CLK cycle after the encoder

negates BLANK.

1 = Data for the first active pixel of the scan line must arrive immediately after the encoder ne-

gates BLANK.

Reserved

BLANK Output Con-

trol

0 = BLANK is an input

1 = BLANK is an output

BLANK

Polarity

0 = Active low (low during blanking)

1 = Active high (high during blanking)

HSYNC and

VSYNC Output

Control

0 = HSYNC and VSYNC are inputs

1 = HSYNC and VSYNC are outputs

HSYNC

Polarity

0 = Active low (low during horizontal sync)

1 = Active high (high during horizontal sync)

VSYNC

Polarity

0 = Active low (low during vertical sync)

1 = Active high (high during vertical sync)

FIELD

Polarity

0 = Active low (low during odd fields)

1 = Active high (high during odd fields)

HMP8154, HMP8156A

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