Z86129 Datasheet, PDF (15/50 Pages) Zilog, Inc. – NTSC LINE 21 DECIDER

PRELIMINARY
Z86129/130/131
NTSC Line 21 Decoder
XDS Display Modes (Z86129 only)
Since 15 scan lines per row mode is being used, rows 10-
Two preprogrammed XDS display modes are provided. ^{13 will appear at the bottom of the screen.}
One provides information about the current program that
would be of interest for “channel grazing”. The second ^{OSD Row 1 Network Name, Call Letters (Green)}
1
display shows the grazing packets plus additional XDS ^{OSD Row 2 Program Name (Italics, Underline,}
packets which will inform the viewer about the program
White)
content. Information will be displayed as it is received. The OSD Row 3 Program Length, Program Type, Time In
displays use drop shadow mode with 15 scan lines per
Show (Cyan)
row.
OSD Row 10 Program Description Row 1 (Yellow)
The XDSG mode is the GRAZE (channel grazing) display
(Figure 7). The display will contain three rows of
information at the top of the screen, formatted for easy
OSD Row 11 Program Description Row 2 (Yellow)
OSD Row 12 Program Description Row 3 (Yellow)
OSD Row 13 Program Description Row 4 (Yellow)
reading. They will contain the following XDS packet
information:
OSD Row 1
OSD Row 2
OSD Row 1 Network Name, Call Letters (Green)
OSD Row 2 Program Name (Italics, Underline, White)
OSD Row 3 Program Length, Time In Show (Cyan)
Network Name
Program Name
Program Length
Call Letters
Time in Show
OSD Row 1
OSD Row 2
OSD Row 3
Network Name
Program Name
Program Length
Call Letters
Time in Show
Program Description information goes
here on OSD rows 10, 11
12 and,
13
OSD Row 3
Figure 8. XDSF Mode Sample Display
Figure 7. XDSG (Graze) Mode Sample Display
The XDSF mode is the FULL (information) display (Figure
8). This display shows the same information as the
GRAZE display and adds the program type as well the first
four program description rows (if transmitted). Although
XDS defines eight program description rows, the first four
are identified as containing the most important information.
The display of Program Description is limited to the first
four rows because eight rows would obscure much of the
screen and because more than four rows is not likely to be
sent due to the time required for transmission.
When an XDS display mode has been selected, the
information will be displayed as the appropriate packets
are received. The display will remain on screen as long as
valid XDS data continues to be received. If the 16 Second
Erase Timer is enabled (the default condition), the XDS
display will be erased when no valid XDS data has been
received for 16 Seconds. If subsequent XDS data is
received with displayable packets, that information will
reappear on the screen. XDS data recovery can be active
in the XDS display mode.
The XDS display mode is turned off by selecting a different
display mode.
DS96TEL0200
15