The Z86129/130/131 is a stand-alone integrated circuit, capable of processing Vertical Blanking Interval (VBI) data from both fields of the video frame in data conforming to the transmission format defined in the Television Decoder Circuits Act of 1990 and in accordance with the Electronics Industry Association specification 608 (EIA-608).
The Line 21 data stream can consist of data from several data channels multiplexed together. Field 1 has four data channels: two Captions and two Text. Field 2 has five additional data channels: two Captions, two Text and Extended Data Services (XDS). XDS data structure is defined in EIA-608. The Z86129 can recover and display data transmitted on any of these nine data channels. The Z86130 and Z86131 are derivatives of the Z86129. The Z86130 and Z86131 do not have OSD capability, but are ideally suited for Line 21 data slicer applications.
The Z86129/130/131 can recover and output to a host processor via the I²C serial bus the recovered XDS data packet defined in EIA-608 as it is defined in the table above (Z86130 provides the raw Line 21 data, which must be decoded properly for the applications). On-chip XDS filters in Z86129 is fully programmable, enabling recovery of only those XDS data packets selected by the user. The Z86131 is designed especially for extracting XDS time information with proper XDS filter setup for Automatic Clock-Set features in TVs, VCRs, and Set-Top boxes. And the Z86130 is designed especially for V-Chip and Line 21 data recovery.
In addition, the Z86129/130 is ideally suited to monitor Line 21 of video displayed in a PiP window for violence blocking purposes.
Zilog Z8613112PSG