ZILOG Z86L2908PSC, Z86L2908SSC Datasheet

217

1

Z86129/130/131

1

NTSC L

INE

21 D

ECODER

FEATURES

■

Complete Stand-Alone Line 21 Decoder for Closed­Captions 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 such as Time of Day, Local Time Zone, and
Program Rating ( V-Chip ).

■

Cost-Effective Solution for NTSC Violence Blocking
inside Picture-in-Picture (PiP) Windows.

■

Minimal Communications and Control Overhead
Provides Simple Implementation of Violence Block,
Closed Caption, and Auto Clock Set Features.

■

Programmable, Full Screen On-Screen Display (OSD)
for Creating OSD or Captions inside a Picture-in-Picture
(PiP) Window (Z86129 only).

■

I

2

C Serial Data and Control Communication

■

User-Programmable Horizontal Display Position for
easy OSD Centering and Adjustment (Z86129 only).

GENERAL DESCRIPTION

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 which can re­cover XDS data and output the recovered data via the se­rial port. The Z86130 and Z86131 do not have OSD capa-

bility, but are ideally suited for Line 21 data slicer
applications.

The Z86129/130/131 can recover and output to a host pro­cessor via the I

2

C serial bus any XDS data packet defined
in EIA-608. On-chip XDS filters are fully programmable,
enabling recovery of only those XDS data packets selected
by the user, making the Z86129/130 an ideal choice for im­plementing NTSC Violence Block. The Z86131 is designed
especially for extracting XDS time information for Automat­ic Clock-Set features in TVs, VCRs, and Set-Top boxes.

In addition, the Z86129/130 is ideally suited to monitor Line
21 of video displayed in a PiP window for violence blocking
purposes. A block diagram of the Z86129/130/131 is
shown in Figure 1.

Speed Pin Count/ Standard On-Screen Display Automatic Data Extraction

Devices (MHz) Package Types Temp. Range & Closed Captioning V-Chip Time of Day

Z86129 12 18-Pin DIP, SOIC 0 ° to +70 ° C Yes Yes Yes
Z86130 12 18-Pin DIP, SOIC 0 ° to +70 ° C No Yes Yes
Z86131 12 18-Pin DIP, SOIC 0 ° to +70 ° CNo NoYes

Z86129/130/131
NTSC Line 21 Decoder

218

GENERAL DESCRIPTION (Continued)

Figure 1. Z86129 Block Diagram

Video

7

Buffer

VW

Data

Slicer

Data CLK

Recovery

Sliced

Data

Data Line

Data Bus

Dual

Clamp

Lock

SIG

SYNC

Slicer

PG

CSYNC

Digital

II Lock

FEW

AW

VIN/

Intro

Serial

Control Port

Status Reg

Test Reg

Slice Level

CG

Logic

PH1

PH2

FR

I Drive

OSCO/S

& MUX

Control

CG Lines

MSYNC

COMP SYNC

5

HIN

9

LPF

Loop

1

Filter

DOT CLK

DIV

Line &

CHAR

CIR

V Lock

Field

FLD

LS

SFLD

SLS

Control

CHAR CLK

CW

Line & Fld

Decodes

MSGR

DOT CLK

SMS

SEN

SCK

SDA

SDO

6 4 15 14 1613

VDD

+5V

12

11

Vss

Vss(A)

RREF

POR

CKT

4

10

Command

Processor

Row

Address

MUX

Display

RAM

Character

Generator

Row

Latch

Display

Latch

SS CTR

Output

Logic

10

6

8

13

4

FLD

V/I

Ref

RED
GREEN
BLUE
BOX

17 3 2 18

Addr Bus

ADDR

DEC

ADDR

Decoder

8

Z86129 only