SAB9079 datasheet(13/48 Pages) PHILIPS

13 / 48 page

2000 Jan 13

Philips Semiconductors

Preliminary speciﬁcation

Multistandard Picture-In-Picture (PIP)

controller

SAB9079HS

Acquisition window

The acquisition window is 720 pixels. This is related to a

whole line of 896 pixels. So for PAL

will be

acquired from the active video. For NTSC this will be

slightly less

The vertical acquisition window is 228 lines for NTSC and

276 lines for PAL. Data will be acquired in a 4 :2:2

format. The acquisition clock is 896

× HSYNC.

Acquisition ﬁne positioning

All I2C-bus settings relate to the incoming HSYNC,

whether this is a real HSYNC or a burstkey for horizontal

positioning. The same applys for the incoming VSYNC for

vertical positioning. The relationships between the

acquisition window and the internal clamp pulse are

illustrated in Fig.6. In an application the clamp pulse must

be positioned, by the I2C-bus, between the HSYNC and

the start of the active video of the incoming signal.

Display window

The display window available for PIP pictures is also

720 pixels wide, related to a 896 pixels line. The vertical

display window is 228 lines for NTSC and 276 lines for

PAL.

Background window

The origin of the display window is referenced to the origin

of the background window. The background area is

768 pixels wide. Vertically it is 238 lines for NTSC and

286 lines for PAL.

Display ﬁne positioning

The I2C-bus defined fine positioning has relationships to

the internal HSYNC and VSYNC as illustrated in Fig.7.

720

896

----------

µs

720

896

----------

63.5

µs

Fig.6 Acquisition fine positioning.

handbook, full pagewidth

MGS391

MAHFP

MAVFP

CIDEL

CIPER

228/276 lines

720 pixels

The grey area depicts the background.

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