SAB9077H Просмотр технического описания (PDF) - Philips Electronics

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SAB9077H

Picture-In-Picture (PIP) controller

Philips Electronics 

Philips Semiconductors

Picture-In-Picture (PIP) controller

Preliminary specification

SAB9077H

handbook, full pagewidth

BGVFP

BGHFP

MAHFP

MAVFP

SAHFP

MAIN CHANNEL

696 pixels

SAVFP

SUB CHANNEL

238 lines (NTCS)

or

286 lines (PAL)

Fig.3 Display fine positioning.

MBH503

PIP modes

The two independent acquisition channels can also be

controlled independently on the display side. A wide

variety of modes is possible but a subset of 7 modes is

fixed and can be set easily by the I2C-bus. An overview of

the preconditioned modes is given in Table 3. For all PIP

modes the main and sub-display fine positioning must be

set to obtain a display configuration.

DATA TRANSFER

The internal data path has an 8-bit resolution and 4 : 1 : 1

data format. The communication to the external VDRAM

takes place at 864 × Hsync (both display and acquisition).

Approximately 800 8-bit words can be fetched from the

external VDRAM in one display line which is not enough to

display one complete display line with true 8-bit resolution.

Two methods of reducing data are available. One is simply

skipping the 8-bit to 6-bit (SKIP6, I2C-bus bit) and the other

is a small form of data reduction to come from 8-bit to 6-bit

(SMART6, I2C-bus bit). If both bits are set to logic 0 the

device is in true 8-bit resolution mode. For the twin PIP

mode the main channel is not placed in the VDRAM but in

an internal buffer, 8 bit resolution is then possible for both

PIPs.

1996 Aug 07

10

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