z86131 ZiLOG Semiconductor, z86131 Datasheet - Page 22

• Manufacturer Part Number: z86131
• Description: Ntsc Line 21 Decoder
• Manufacturer: ZiLOG Semiconductor

Z86129/130/131
NTSC Line 21 Decoder
Z86129/130/131 FEATURE SET (Continued)
Modes are available with the Z86129/130/131 performing
as a slave device. These modes are:
1. A two wire, I
2. A three wire, serial peripheral interface (SPI).
3. A total of five device pins are dedicated to the serial
I
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 is reset. SDA
and SCK are the data and clock lines of the I2C port, re-
spectively. During I2C mode operation the VIN/INTRO
signal (pin 13), can be configured to generate interrupt re-
quests to the master device on selected events (see Note,
next column).
SPI Mode.
High. In SPI mode the Z86129/130/131 acts as a slave de-
vice. 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, the SDO pin is tri-stated.
When SEN is brought High the part is synchronized and
waiting for a Command. If SEN is tied High, the part can
also be synchronized by a command string. During SPI
mode operation the V
figured to generate interrupt requests to the master device
on selected events (Z86129/131 only; see Note, next col-
umn).
22
Signal
Pin #
I/O
I
SPI
Notes:
SMS = Serial Mode Select High = SPI and Low = I
SCK = Serial port clock for either Serial Mode.
SDA = Serial port data for I
SDO = Serial Data Out for SPI Mode. Not used in I
SEN = SPI Mode Enable signal. Must be High for I
2
2
C Mode.
C
Table 11. Z86129/130/131 Serial Control Signals
control port function. These pins are designated as:
The I2C port on the Z86129/130/131 always
SMS
SSPI Mode is selected by making the SMS pin
6
0
1
I
2
C interface.
SCK
CLK
CLK
IN
15
I
/INTRO signal (pin 13), can be con-
2
C Mode and Data In for SPI Mode.
Data In
SDA
Data
I/O
14
Data Out Enable
SDO
NA
16
O
2
2
2
C.
C Mode.
C Mode.
P R E L I M I N A R Y
SEN
4
1
I
Caution: When the SEN and SMS pins are made Low simul-
Interrupt Generation.
Z86129/131 can be configured to provide an interrupt out-
put on selected events. The configuration of V
(pin 13) is user programmable to be either of two states in
Z86129/131:
1. An INPUT pin for acceptance of an external VSYNC
2. An OUTPUT pin for interrupt generation on a selected
Note: Configuring
Setup and Operational Control
The Z86129/130/131 is extremely flexible and fully pro-
grammable through its serial communication port. The fol-
lowing tables provide a
Features, User Selectable Display Modes, and Default Con-
ditions upon Reset.
Z86129/130/131 Programmable Features (OSD
features are for the Z86129 Only)
¥
¥
¥
¥
¥
¥
¥
¥
¥
timing signal(Z86129 only).
events(Z86129/131).
Decoder ON/OFF
TV scan lines per OSD row (13 or 15)
EIA–608 extended attributes ON/OFF
OSD drop shadow ON/OFF
Color/Monochrome
OSD Horizontal start position
Text box size (# of rows)
Text box starting row position
NTSC or PAL
eration is particularly useful when implementing the
V-Chip feature with Z86129 in TVs and VCRs. In this
configuration, Pin 13 is used to interrupt the host proces-
sor when the XDS Program Rating data packet is found.
As a result the host processor is not burdened with mon-
itoring or filtering the line 21 data stream. The
Z86129/131 filters the Line 21 data stream for the host
processor, and generates an interrupt only when the de-
sired packet is found.
Z86130 and it serves as Program Blocking output pin for
V-Chip application.
taneously, the part resets.
V
IN
/INTRO as an output for interrupt gen-
The V
partial list
V
IN
IN
/INTRO signal (pin 13) in
/INTRO pin becomes PB in
of User-Programmable
DS007200-TVX0199
IN
/INTRO
ZiLOG