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SAB9081H

Multistandard Picture-In-Picture (PIP) controller

Philips Electronics 

Philips Semiconductors

Multistandard Picture-In-Picture (PIP)

controller

Preliminary specification

SAB9081

MPIPON (DOUBLE WINDOW)

Bit MPIPON is used to switch the main channel PIP on

(logic 1) or off (logic 0).

SPIPON

Bit SPIPON is used to switch the subchannel PIPs on

(logic 1) or off (logic 0).

PRIO

The priority bit decides whether the main channel PIP (Prio

set to logic 0) or the subchannel PIP (Prio set to logic 1)

will be on top when both PIPs overlap.

S1FLD

If S1FLD is set to logic 0, two fields are used for the live

PIP. When a 50/60 Hz or a 60/50 Hz mode is detected, the

SAB9081 automatically switches to the 1-Field mode

(1-Field resolution vertically).

If S1FLD is set to logic 1, only one field is used. This

causes joint line errors but saves memory. This bit should

not be set in normal modes.

SFREEZE

With SFreeze set to logic 1, the current live subchannel

PIP will be frozen. If set to logic 0, it is unfrozen.

ALGOFF

In double window mode, precautions are taken to prevent

a joint line error. Under some conditions, this feature

should be switched off. This can be realized by setting this

bit to logic 1. Normally, bit AlgOff should be set to logic 0.

Bit SV3, when set to logic 0, can overrule bit AlgOff. It is

recommended to set SV3 to logic 1.

DNONINT

In normal mode (this bit is logic 0), the SAB9081 calculates

whether a signal is non-interlaced and reacts accordingly.

With bit DNonint set to logic 1, the display channel is

forced into the non-interlaced mode. In the non-interlaced

mode, only one field is used during the processing of the

PIPs.

PIPMODE

Bits PipMode<2:0> determine the PIP modes for the

SAB9081, as shown in Table 2.

Table 2 PIP modes

PipMode<2:0>

000

001

MODE

double window mode

replay mode

SHRED AND SVRED (DOUBLE WINDOW)

Bits SHRed<5:0> and SVRed<6:0> determine the

reduction factors in the double window mode.

The horizontal reduction is equal to SHRed/96; the vertical

reduction is equal to SVRed/96. SHRed should lie in the

range from 0 to 48; if set to logic 0, the PIP is off. SVRed

should lie in the range from 0 to 96; if set to logic 0, the PIP

is off.

When the horizontal reduction factor is 48/96,

704 samples are processed. The horizontal reduction is

linear; therefore, when it is 24/96, 352 samples are

processed. The same holds for the vertical reduction factor

but then with the number of lines. For NTSC, the number

of processed lines can be calculated from

SVRed/96 × 228 lines; for PAL, this is SVRed/96 × 276

lines.

SHRED AND SVRED (REPLAY)

In the replay mode, the ranges of SHRed and SVRed are

limited as follows: SHRed = 12; SVRed = 24, 16 or 12.

This leads to a fixed horizontal reduction factor of 1⁄8; and

to a variable vertical reduction factor of 1⁄4, 1⁄6 or 1⁄8.

Note that the resulting replay PIP can be expanded by

using bits SHBlow and/or SVBlow.

BGHFP AND BGVFP

These bits control the horizontal and vertical positioning of

the PIP configuration on the screen. The horizontal range

is adjustable in 16 steps of four 28 MHz clock periods.

The vertical range is 16 steps of 1 line/field. The

background colour can be adjusted with bits BSel, SBBrt

and SBCol.

SDHFP AND SDVFP

These bytes control the horizontal and vertical positioning

of the subchannel PIPs on the screen. The horizontal

range is 256 steps of eight 28 MHz clock periods.

The vertical range is 256 steps of 1 line/field.

1999 Nov 12

9

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