Z86129 Datasheet, PDF (17/50 Pages) Zilog, Inc. – NTSC LINE 21 DECIDER

PRELIMINARY
Z86129/130/131
NTSC Line 21 Decoder
General Purpose OSD Modes (Z86129 only) Serial Communications Interface
In addition to displaying data extracted from Line 21 of the Communications and control of the Z86129/130/131 is
1 ^{incoming video, the Z86129 can display information through a serial control interface. Two Serial Control}
supplied through its serial port. This is referred to as On- Modes are available with the Z86129/130/131 performing
Screen Display (OSD) display mode. This mode provides: as a slave device. These modes are:
s Programmable Full Screen OSD: 15 display rows by
32 character columns
s Graphics characters
s Double high and double wide characters
1. A two wire, I²C interface.
2. A three wire, serial peripheral interface (SPI).
3. A total of five device pins are dedicated to the serial
control port function. These pins are designated as:
s Fully programmable display positioning; information
may be placed anywhere on the screen.
s Accepts externally supplied, or internally generated
VSYNC to enable OSD even when no video is
present.
Character Set
The Z86129 has a new character set with extended
features, such as:
s New font with descenders on lower case letters
s Optional display mode using drop shadow font (in
other words, fringing appears on each character rather
than a solid, “black box” background).
s EIA-608 Extended Characters
s EIA-608 Background and Foreground attributes
s Special framing and graphics characters for OSD
display.
s Double High and Double Wide character display for
OSD.
s Fifteen scan lines per character row for OSD and
TEXT.
Note: Contact the nearest Zilog Sales office for additional
information on how to define your own custom OSD
character set.
Table 2. Z86129/130/131 Serial Control Signals
Signal
Pin #
I/O
I²C
SPI
SMS
6
I
0
1
SCK
15
I
CLK
CLK
SDA
14
I/O
Data
Data In
SDO
16
O
NA
Data Out
SEN
4
I
1
Enable
Notes:
SMS = Serial Mode Select High = SPI and Low = I²C
SCK = Serial port clock for either Serial Mode.
SDA = Serial port data for I²C Mode and Data In for SPI Mode.
SDO = Serial Data Out for SPI Mode. Not used in I²C Mode.
SEN = SPI Mode Enable signal. Must be High for I²C Mode.
I²C Mode. The I²C port on the Z86129/130/131 always
acts as a slave device. I²C Mode is selected by bringing
the SMS pin Low and the SEN pin High. SEN must remain
High whenever I²C mode is desired. If the SEN pin is
brought Low, with SMS also Low, the part will be reset.
SDA and SCK are the data and clock lines of the I²C port,
respectively. During I²C mode operation the VIN/INTRO
signal (pin 13), can be configured to generate interrupt
requests to the master device on selected events. (See
Note paragraph below.)
SPI Mode. SSPI Mode is selected by making the SMS pin
High. In SPI mode the Z86129/130/131 acts as a slave
device. All communications are clocked in and out as 8-bit
bytes. SCK is the serial clock (input), SDA is Data-In and
SDO is Data-Out. The SEN pin enables communication
when High, when Low High High High, the SDO pin is tri-
state.
DS96TEL0200
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