SDA9400 datasheet(21/94 Pages) MICRONAS

21 / 94 page

SDA 9400

Micronas

Preliminary Data Sheet

The three different “multi picture modes” can be selected by the parameter MULTIPIC. MULTIPIC=0

defines normal operation without compression. The table below explains the performed

compressions depending on the “multi picture mode” and the corresponding aspect ratio of the

display.

Input write parameter: MULTIPIC

To get a “multi picture display” the following executions must be performed:

Entering a “multi picture mode” is defined by transmitting a value MULTIPIC>0. This value of

MULTIPIC must not be equal to the previous value of MULTIPIC. During the following two fields the

memory will be completely filled with a constant colour defined by the parameters YBORDER,

UBORDER, VBORDER. This colour is identical to the background and the borders of the multi

picture display. The same procedure is performed when the “multi picture mode” changes from a

value MULTIPIC>0 to another value MULTIPIC>0. Beginning with the following field the

compressed input picture is written at the position PICPOS addressed via I²C-bus. The user has to

address all possible positions PICPOS one after the other to build a complete multi picture display.

In sequence, the background colour is replaced by the small pictures. The not overwritten areas of

the background colour form the borders of the multi picture display.

The pictures can be taken from the same source (’Shots of a Sequence’) or from different sources

(’Tuner Scanning’). The actual addressed picture is moving until “Freeze mode” is activated.

Before entering “multi picture mode” the “H-and-V-freerunning mode” (see also

Output sync

controller (OSC) on page 40) should be activated via the I²C bus bits HOUTFR and VOUTFR,

especially when “Tuner Scanning” will be performed. The “H-and-V-freerunning mode” avoids

synchronization problems of the display during changing the tuner channel.

The values of ALPFIP (Active Lines Per Field Input, see also

Input sync controller (ISC) on page

11), and ALPFOP (Active Lines Per Field Output, see also

Output sync controller (OSC) on page

40) must be set to 144 or 121, respectively. Only these standard signals corresponding to PAL and

NTSC systems are supported. A mixture of PAL and NTSC signals is also possible.

Input write parameter

MULTIPIC (1Bh)

Horizontal compression

Vertical compression

Aspect ratio of the display

00 (Multi Picture Off)

normal operation, no compression

01 (fourfold)

2 : 1

4 : 3

10 (twelvefold)

4 : 1

3 : 1

16 : 9

11 (sixteenfold)

4 : 1

4 : 3

Parameter

Subaddress

Description

MULTIPIC

1Bh

Defines the multi picture modes

PICPOS

1Bh

Position of the picture in the multi picture mode (only

valid for MULTIPIC>0)

YBORDER

17h

Y background value

UBORDER

18h

U background value

SDA9400 Datasheet(PDF) 21 Page - Micronas

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