Z86229

• Complete Stand-Alone Line 21 Decoder for Closed- Captioned and Extended Data Services (XDS)
• Preprogrammed to Provide Full Compliance with EIA608 Specifications for Extended Data Services
• Automatic Extraction and Serial Output of Special XDS Packets (Time of Day, Local Time Zone, and Program Blocking)
• Programmable XDS Filter for a Specific XDS Packet
• Cost-Effective Solution for NTSC Violence Blocking inside Picture-in-Picture (PiP) Windows
• Minimal Communications and Control Overhead Provide Simple Implementation of Violence Blocking, Closed Captioning, and Auto Clock Set Features
• Programmable, On-Screen Display (OSD) for Creating Full Screen OSD or Captions inside a Picture-in- Picture (PiP) Window
• User-Programmable Horizontal Display Position for easy OSD Centering and Adjustment
• I2C Serial Data and Control Communication
• Supports 2 Selectable I2C Addresses

*Voltages referenced to Vss(A).Values beyond the maximum ratings listed above may cause damage to the device .Functional operation should be resticted to the limits specified in the DC and AC Characteristics tables or pin Description section.

Capable of processing Vertical Blanking Interval (VBI) data from both fields of the video frame in data, the Z86229 Line 21 Decoder offers a feature-rich solution for any television or set-top application. The robust nature of the Z86229 helps the device conformto the transmission format defined in the Television Decoder Circuits Act of 1990, and in accordance with the Electronics Industry Association specification 608 (EIA608).

The Line 21 data streamcan consistof data fromseveral data channels multiplexed together. Field 1 consists of four data channels: two Captions and two Texts. Field 2 consists of five additional data channels: two Captions, two Texts, and Extended Data Services (XDS). The XDS data structure is defined in EIA608. The Z86229 can recover and display data transmitted on any of these nine data channels.

The Z86229 can recover and output to a host processor via the I2C serial bus. The recovered XDS data packet is further defined in the EIA608 specification. The on-chip XDS filters in the Z86229 are fully programmable, enabling recovery of only thoseXDSdata packets selected by the user. This functionality allows the device to extract the required XDS information with proper XDS filter setup for compatibility in a variety of TVs, VCRs, and Set-Top boxes.

In addition, the Z86229 is ideally suited to monitor Line 21 video displayed in a PiP window for violence blocking, CCD, and other XDS data services. A block diagram of the Z86229 is illustrated in Figure 1.