z86228 ZiLOG Semiconductor, z86228 Datasheet

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z86228

Manufacturer Part Number
z86228
Description
Line Closed Caption Controller L21c
Manufacturer
ZiLOG Semiconductor
Datasheet

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z8622812PSC
Manufacturer:
AT&T
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Part Number:
z8622812PSC
Manufacturer:
ZILOG
Quantity:
20 000
GENERAL DESCRIPTION
The Z86228 (Line 21 Closed-Caption Controller) is a single
I.C. designed to provide the functional performance of a
L21C Decoder module. This Superintegration™ VLSI device
is completely self contained requiring only composite
video, a horizontal timing signal as input and an external
keyer (i.e., video switch between TV video and Closed-
Caption video) to produce captioned video. The Z86228
uses a wired logic approach to perform the functions
selected through its input control signals. It is fabricated
using standard CMOS technology and designed to achieve
the lowest possible cost.
The Z86228 is intended for use in a set-top decoder or in
any television receiver conforming to the NTSC standard.
It is capable of processing and displaying all standard
L21C format transmissions including the codes specified
DC-4243-00
(2-18-94)
P R E L I M I N A R Y
P
C
Z86228
L
C
by the FCC "Report and Order" on GEN Docket No. 91-1,
dated April 12, 1991. In addition, the device conforms to
the Electronic Industry Association's Recomended Practice
608, which provides supplemental guidelines for the
transmission of captions, text, and Extended Data Services
(EDS) on NTSC Field 2. Extended Data Services (EDS)
packets encoded on Field 2 , may be displayed in either of
two screen formats. If and when PAL and SECAM TV
standards define a protocol using the Line 21 format, this
design will be readily convertible to that standard.
The Line 21 Closed Captioning System
The L21C system provides for the transmission of CAPTION
information and other TEXT material as an encoded
composite data signal. This is during the unblanked portion
of Line 21, field 1, of the standard NTSC video signal. The
video signal conforms to the Standard Synchronizing
Waveform for Color Transmission given in Sub-part E, Part
73 of the FCC Rules and Regulations.
RELIMINARY
USTOMER
INE
ONTROLLER
21 C
P
LOSED
ROCUREMENT
(L21C)
C
APTION
S
PECIFICATION
CPS DC-4243-00
1

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z86228 Summary of contents

Page 1

... It is fabricated using standard CMOS technology and designed to achieve the lowest possible cost. The Z86228 is intended for use in a set-top decoder or in any television receiver conforming to the NTSC standard capable of processing and displaying all standard ...

Page 2

... V Digital Power pin. Connect to +5V source Analog DD V Analog. Analog Ground. Connect to SS system ground. (NSIN) Input (Control) Selects the mode to be used in interpreting the signals on the three Control pins. High = Parallel Mode, Low = Serial Mode. Z86228 ...

Page 3

... Z86228 assumed that the delay through the low pass filter will be 220 ns (refererence Figure). There are two ways to execute a FULL RESET of the Z86228: 1 ...

Page 4

... Min Max 0 0. –0.4 CC –.0 3.0 25 0.2V , High 0. IRE Z86228 CPS DC-4243-00 Units Conditions 1. [ 0. [3] ...

Page 5

... IRE "white" Blanking 0 IRE -40 IRE 13.6 s Comp Video 1 LOW PASS A FILTER Cell Width = 1.324 s CHAR LUM = 42.370 s BOX = 45.018 s 35.73 s LUM BOX Z86228 Line 21 AC/DC Timing CPS DC-4243-00 Center of Active Video -(100) IRE Z86228 -(0) IRE -(40) IRE 5 ...

Page 6

... ENA low time ENI T A0 set-up time ASU T A0 hold time Tckh Tdsu Tdh Tasu Tah D0-IN D(1-7)-IN A0-IN Serial Mode Timing Diagram Z86228 CPS DC-4243-00 Tenl Tout Toff HI-Z HI-Z SS-OUT Min. Max. Units 200 ns 100 ns 200 ns 200 ns 200 ...

Page 7

... Zilog, Inc. 210 East Hacienda Ave. Campbell, CA 95008-6600 Telephone (408) 370-8000 Telex 910-338-7621 FAX 408 370-8056 Z86228 CPS DC-4243-00 7 ...

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