SDA9400 Datasheet, PDF (19/94 Pages) Micronas – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9400
Inside the SDA 9400 the number of active lines per field depends on the chosen vertical
compression factor VDECON (see also Output sync controller (OSC) on page 40).
6.3.2 Horizontal compression
The horizontal compression compresses the incoming signal horizontally by a constant factor. For
the Y and UV signal the same filter characteristics are used. The horizontal compression can be
switched off.
The table below shows the relation between the parameter HDECON and the compression factor.
Input write parameter: HDECON
HDECON (1Ch)
00
01
10
11
no horizontal compression
factor 2
factor 4
not defined
The APPLIP (Active Pixels Per Line Input, see also Input sync controller (ISC) on page 11) value
defines the length of an active line. Inside the SDA 9400 the number of active pixels per line is
APPL (Active Pixels Per Line) and its value depends on the chosen horizontal compression factor
HDECON. The table below explains the connection between APPL and APPLIP (see also Output
sync controller (OSC) on page 40).
Connection between APPL and APPLIP
Mode
no horizontal compression (HDECON = ’00’)
horizontal compression, Factor 2 (HDECON = ’01’)
horizontal compression, Factor 4 (HDECON = ’10’)
MULTIPIC > ’0’ (dominant, see also Multipicture display on page 20)
APPL
APPLIP
(APPLIP + 1) / 2
(APPLIP + 3) / 4
45
Micronas
19
Preliminary Data Sheet