% & % Complete Stand-Alone Line 21 Decoder for Closed- Minimal Communications and Control Overhead Pro- Captioned and Extended Data Services (XDS) vide Simple Implementation of Violence Blocking, Closed Captioning, and Auto Clock Set Features Preprogrammed to Provide Full Compliance with EIA608 Specifications for Extended Data Services Programmable, On-Screen Display (OSD) for Creat- ing Full Screen OSD or Captions inside a Picture-in- Automatic Extraction and Serial Output of Special Picture (PiP) Window XDS Packets (Time of Day, Local Time Zone, and Program Blocking) User-Programmable Horizontal Display Position for easy OSD Centering and Adjustment Programmable XDS Filter for a Specific XDS Packet 2 I C Serial Data and Control Communication Cost-Effective Solution for NTSC Violence Blocking 2 inside Picture-in-Picture (PiP) Windows Supports 2 Selectable I C Addresses Capable of processing Vertical Blanking Interval (VBI) defined in EIA608. The Z86229 can recover and display data from both fields of the video frame in data, the Z86229 data transmitted on any of these nine data channels. Line 21 Decoder offers a feature-rich solution for any tele- The Z86229 can recover and output to a host processor via vision or set-top application. The robust nature of the 2 the I C serial bus. The recovered XDS data packet is further Z86229 helps the device conform to the transmission format defined in the EIA608 specification. The on-chip XDS fil- defined in the Television Decoder Circuits Act of 1990, and ters in the Z86229 are fully programmable, enabling recov- in accordance with the Electronics Industry Association ery of only those XDS data packets selected by the user. This specification 608 (EIA608). functionality allows the device to extract the required XDS The Line 21 data stream can consistof data from several data information with proper XDS filter setup for compatibility channels multiplexed together. Field 1 consists of four data in a variety of TVs, VCRs, and Set-Top boxes. channels: two Captions and two Texts. Field 2 consists of In addition, the Z86229 is ideally suited to monitor Line 21 five additional data channels: two Captions, two Texts, and video displayed in a PiP window for violence blocking, Extended Data Services (XDS). The XDS data structure is CCD, and other XDS data services. A block diagram of the Z86229 is illustrated in Figure 1. ()*++ , - . +/ ZiLOG Figure 1. Z86229 Block Diagram +5V VDD 13 6 4 15 14 16 1 12 Sliced Data Line 7 Data Data CLK Serial Data Video Buffer Recovery Slicer Control Port Data Bus Row Lock Status Reg AW FEW Dual SIG Clamp Digital Test Reg PG II Lock Command Processor SYNC 8 Slicer Slice Level CSYNC Row 4 Latch 10 Address MUX DOT CLK 6 DOT CLK CG Lines Display DIV RAM VLock ADDR CG CHAR CLK DEC Logic 8 Display CW Latch CHAR 13 Character CIR FLD O/S OSC Generator MSGR ADDR 4 Decoder PH1 SS CTR Output FLD IDrive Logic PH2 Control &MUX LS Line & SFLD Field Control SLS FR V/I POR Ref CKT Line & Fld Decodes 10 11 5 9 17 3 2 18 HIN Vss(A) RREF LPF Z86229 only Loop Filter MSYNC COMP SYNC V / VW IN Intro SMS SEN SCK SDA SDO 2 I CSEL BOX BLUE GREEN RED Addr Bus