Polaroid PLA-4200M, Service Manual

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PDP TV SERVICE MANUAL
(4) Z86229
NTSC LINE 21 CCD DECODER
GENERAL DESCRIPTION
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 (EIA–608).
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 EIA–608. 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 I
2
C serial bus. The recovered XDS data packet is
further defined in the EIA–608 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.
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