Z86230 Datasheet, PDF (9/61 Pages) Zilog, Inc. – ADVANCED VIOLENCE BLOCKING AND NTSC 21 XDS

BLOCK DIAGRAM AND OPERATIONAL OVERVIEW
ARCHITECTURAL OVERVIEW
1. ARCHITECTURAL OVERVIEW
The Z86230 is a stand-alone integrated circuit, capable of processing Extended
Data Services (XDS) in Field 2 of the Vertical Blanking Interval (VBI) of a video
frame. This device conforms to the transmission format defined in the Television
Decoder Circuits Act of 1990, in accordance with the Electronics Industry Associ-
ation specification EIA-608A and EIA-744A.
The XDS data is processed to provide either a Program Blocking signal (PB) or a
recovered XDS data packet. The PB matches the contents of the recovered Con-
tent Advisory packet to the user selections input on the decoder. On-chip XDS fil-
ters in the Z86230 are fully-programmable, enabling recovery of only those XDS
data packets selected for use in TVs, VCRs, and Set-Top boxes.
In addition, the Z86230 is ideally suited to monitor Picture-In-Picture (PiP) win-
dow video for violence blocking and other XDS data services.
Highlights of the Z86230 include:
1. A stand-alone Line 21 Decoder for Extended Data Services (XDS).
2. Extractable XDS data from the input video.
3. Full output of a selectable V-Chip Program Blocking signal (PB).
4. Selectable XDS filter parameters from a list of preprogrammed values.
5. Minimal communications and control overhead that provides simple
implementation of Violence Blocking and Auto Clock Set Features.
6. Full output of the recovered XDS data through the I²C serial communication
port.
7. Two different slave addresses that are selectable in the I²C serial
communication port.
8. Selectable NTSC or PAL operation.
1.1 BLOCK DIAGRAM AND OPERATIONAL OVERVIEW
The Z86230 is designed to process XDS data of the television VBI. The device
requires both a Composite Video and a horizontal timing signal (HIN/XIN input).
Several passive components are required for proper operation. Commands are
input to enable the decoder to process and control the V-Chip response to the XDS
Content Advisory packet. The Z86230 can also be configured to operate with PAL
video signals. In PAL mode, the device decodes information encoded into VBI
Line 22. The encoded data must conform to the waveform and command structure
defined for NTSC Line 21 operation.
Figure 1 illustrates the Functional Block Diagram of the Z86230.
PS000400-TVC0499
Z86230—PRELIMINARY
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