L64105 Datasheet, PDF (301/454 Pages) List of Unclassifed Manufacturers – AUDIO/VIDEO DECODER

Figure 9.4 Vertical Timing Vcodes and Fcodes for PAL
FCODE:
INIT = LINE 1
F=0
Blanking
Active Video
(main)
VCODE (vertical blanking)
LINE = 1 - [V = 1]
V=1
VCODE ZERO = LINE 21
MAIN START = LINE 23 - [V = 0]
ODD FIELD
Odd field = 313 lines V = 0
FCODE = LINE 312
NEW FIELD = LINE 313
F=1
EVEN FIELD
Blanking
Active Video
(main)
MAIN END = 310 - VCODE EVEN = 310 - [V = 0]
LINE 311 (VCODE EVEN PLUS 1 = 0) - [V = 1]
V=1
LINE = 366 - [V = 0]
Even field = 312 lines V = 0
LINE = 625
LINE = 1
Blanking
LINE = 624 - [V = 1]
LINE = 625
The last required parameter relating to the ITU-R BT.656 timing is the
Fcode fields of Registers 303 and 305 (page 4-70). These bits are
combined to specify the line number at which the field code bit changes.
In general, the Fcode changes one line prior to the new field. For NTSC
and PAL, this value is 265 and 312, respectively.
In the Internal OSD Mode, the OSD display area is obtained from the
header of each OSD display list. Unlike the main display areas, the
horizontal column positions represent pixel offsets from the horizontal
sync, as opposed to device clocks. In the External OSD Mode, the entire
display area is considered the OSD display area. When no mixing is
desired, it is up to the external OSD controller to select a transparent
color from the color palette.
Display Areas
9-9