VCT 38xxA
ADVANCE INFORMATION
To present a WST level 2 display, the teletext display
controller has to evaluate the following attributes in
parallel, that is for every character location:
– 10-bit character code
– 5-bit foreground color
– 5-bit background color
– 2-bit size
– 5-bit flash
– 1-bit invert
– 1-bit separated
– 1-bit conceal
– 1-bit underline
– 1-bit boxing/window
Additional attributes are defined to improve the display
of CAPTION and OSD text:
– 1-bit italics
– 1-bit shadow
– 1-bit color mode
The display controller delivers 5-bit digital color infor-
mation, a shadow signal for contrast reduction, and a
fast blank signal. The color bus is used to address the
color-lookup-table (CLUT) in the video processor. By
this means, the full level 2 color spectrum can be dis-
played.
54
Micronas
MICRONAS [ MICRONAS ]
