Texas Instruments EUROTEXT CF70200 User manual

4Q / 95 Application Specific Integrated Circuits
Consumer Products Family
UNIVERSAL TELETEXT SYSTEMS
Teletext Decoder EUROTEXT
CF70200
Draft 1

4Q / 95 Application Specific Integrated Circuits
CONTENTS
1.0 DESCRIPTION 1
1.1 Eurotext Family of Devices. 2
2.0 PAGE CAPTURE MODES 3
2.1 Normal Mode 5
2.2 FLOF Mode 6
2.3 Favourite Page Mode 6
2.5 Sub-Page Mode 8
2.6 Menu Page Mode 9
3.0 CONTROL INTERFACE 10
4.0 DISPLAY 10
5.0 RGB OUTPUTS 10
6.0 LANGUAGES 13
7.0 SYSTEM TIMING 13
8.0 I2C INTERFACE 13
9.0 PIN DESCRIPTION 15
10.0 EUROTEXT CHARACTER SETS 17
11.0 APPLICATIONS CIRCUITS 21
11.1 Circuit using CF70200 and CF72416 21
11.2 Circuit using CF70200 and CF72306 22
12.0 ABSOLUTE MAXIMUM RATINGS 23
13.0 RECOMMENDED OPERATING CONDITIONS 23
14.0 PACKAGING 25
28 pin Plastic Dual in Line (Wide) 25
44 pin PLCC package 26
Index of Tables
TABLE 1: EUROTEXT FAMILY OF DEVICES. 2
TABLE 2: PAGES STORED IN MEMORY. 4
TABLE 3: PAGE SELECTED TO BE STORED IN TOP MODE. 8
TABLE 4: PAGES STORED IN MEMORY IN THE FOUR DIFFERENT MODES OF OPERATION 9
TABLE 5: LANGUAGES SUPPORTED BY EUROTEXT 13
TABLE 6: RECOMMENDED OPERATING CONDITIONS 23

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
1
 Eight pages of on-chip display RAM
 Europe-wide solution
 Automatic FLOF & TOP decoding
 Flicker-free packet 26 processing on chip
 Program delivery control (PDC)
 Minimum software requirement
 Menu page capability
 Instantaneous page memory clear
 75 Direct Drive RGB outputs
 Digital PLL
 Upgrade path from UNITEXT
 Direct access to subtitles
 Flexible packaging options: 28 DIL,
44 PLCC
1.0 DESCRIPTION
The CF70200 EUROTEXT device is an eight page
intelligent teletext decoder for use with 625 line TV
transmissions having teletext in the Vertical Blanking
Interval (VBI). When used with an Analogue Interface
device (Texas Instruments’ CF72306 or CF72416), it
provides a flexible teletext solution incorporating
internal software to implement FLOF and TOP teletext
decoding automatically.
Eurotext supports a comprehensive range of 29 West
and East European languages in a single device. A full
list is shown on Page 13. Other devices are available in
this family of teletext devices that will support Cyrillic
and Hebrew languages and VPS data capture (Table 1).
On-chip processing of packet 26 characters (flicker free) is automatically implemented as required.
All packets of type 26 are processed in ‘real time’ without the need for any additional memory. This
allows the decoder to store eight pages of teletext irrespective of the language selected and the mode
of operation. On-chip is an 11.5 MIPs micro-coded processor which controls all the teletext
processing requirements, including ghost row processing and TOP table processing. All teletext data
is processed in ‘real time’.
The control of the device is by high level simple commands for all features.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
15
16
17
18
19
20
21
22
23
24
25
26
27
TEST5
SYNC
VIDEO
DVCC
RSTB
CLKIN
DGND
TEST1
TEST4
TDATA
TCLK
CSB
MUTE
TEST2
BLANK
FLAG2
FLAG1
REF
RGBSET
AGND
RED
GREEN
AVCC
BLUE
SDA
SCL
TEST3
WIND
CF70200 28 pin DIL
---- REF
---- DVCC
---- N/C
---- N/C
---- N/C
---- FLAG2
---- FLAG1
---- N/C
---- VIDEO
---- SYNC
---- TEST5
TCLK ----
CSB ----
N/C ----
MUTE ----
TEST2 ----
WIND ----
TEST3 ----
N/C ----
SCL ----
SDA ----
N/C ----
RGBSET
AGND
N/C
N/C
N/C
N/C
RED
GREEN
AVCC
BLUE
BLANK
DVCC
RSTB
N/C
N/C
N/C
N/C
CLKIN
DGND
TEST1
TEST4
TDATA
CF70200 44 pin PLCC
6 5 4 3 2 1 44 43 42 41 40
18 19 20 21 22 23 24 25 26 27 28
7
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
39

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
2
1.0 Description (Continued)
The pin out and software commands have been designed to use either UNITEXT or EUROTEXT
chips without any modification to the hardware or software, allowing a single, four or an eight page
decoder to share the same PCB and controlling software.
In addition to the FLOF and TOP modes the EUROTEXT decoder has a default Normal mode for any
TV channel that is not transmitting FLOF or TOP. The decoder is ideally suited to VCR applications
as it is able to receive and decode PDC information from packets 26 and 8/30 and store this
information inside the decoder. In this mode of operation, memory can also be assigned for menu
pages (pages downloaded from main microprocessor).
1.1 Eurotext Family of Devices.
Other teletext devices are available in the Eurotext family. These devices are all hardware and
software compatible with the CF70200 device.
Part Number VPS Memory On-chip Languages
CF70200 No 8 Pages Western and Eastern European
CF70203 Yes 8 Pages Western and Eastern European
CF70204/5 No 4 Pages Western and Eastern European
CF70209 No 8 Pages Russian, Ukrainian, English
CF70210 No 8 Pages Hebrew
CF70211 Yes 8 Pages Latin and Cyrillic
Table 1: Eurotext Family of Devices.

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
3
2.0 PAGE CAPTURE MODES
The EUROTEXT decoder can operate in four main modes of operation depending upon the
transmitted teletext signal and the controlling microprocessor. These modes are:
Normal
FLOF
TOP
Favourite Page
In EUROTEXT, the on-chip processor will automatically select the pages to be stored in memory in
all modes of operation except Favourite Page mode. EUROTEXT will implement an efficient page
capture algorithm which will ensure that only one version of any page is stored in the memory and
that all the pages will be kept updated with the latest data. When a page is received with the clear
page bit set, or the page is received for the first time, the decoder will clear the relevant page store
instantaneously. This allows the decoder to receive teletext signals using ‘advanced page headers’ or
‘magazine shuffle’.
In addition to the four main modes of operation, the decoder has two additional modes of operation:
Menu Page
Sub Page.
In the Menu Page mode, the page stores 6 and 7 can be redefined as either two menu pages or as one
menu page and one page as a store for non-display packets. This mode allows the chip to be used for
PDC applications.
In the Sub Page mode, the decoder will capture the next two sub-pages of the display page.
In all modes, Teletext pages containing sub-titles can be directly selected.
The four modes of operation can be either selected directly or EUROTEXT can be set into an auto
mode. In auto mode, after a channel change command, the decoder will initially be in normal mode.
If a packet 27 designation code 0 for the display is received, the decoder will switch to FLOF mode.
If the decoder is in normal mode and receives a basic TOP table, it will switch to TOP mode.
In all modes of operation, the row 24 display can be either generated on-chip or can be written to by
the external microprocessor. The external microprocessor can also disable the display of row 24.

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
4
2.0 PAGE CAPTURE
Normal Mode
Packet 27/0
Received for
Display page?
Basic TOP
Table received?
Set to TOP Mode
Packet 27/0
Received for
Display page?
FLOF (Fast-text) Mode.
YES
NO
NO
NO
YES
YES
Store
Number
Normal FLOF Favourite Page TOP
0 Display Page Display Page Display Page Display Page
1 Basic TOP
Table/Inventory Page
Red Basic TOP
Table/Inventory Page
Basic TOP Table
2 P+1 Green Favourite Page 1 Add. Information Table
3 P+2 Yellow Favourite Page 1 Add. Information Table
4 P+3 Cyan Favourite Page 1 TOP Page 1 (see below)
5 P+4 Index Favourite Page 1 TOP Page 2 (see below)
6 Last Page Last Page Last Page TOP Page 3 (see below)
7 P-1 P-1 P-1 TOP Page 4 (see below)/Add.
Information Table
Table 2: Pages Stored in Memory.
The the Four Different Modes of Operation with Sub-page and Menu Page Modes Not Selected
Where ‘P’ is the page number of the current display page
Where ‘Last Page’ is the last page number that the user has entered

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
5
2.1 Normal Mode
EUROTEXT defaults to Normal Mode on power up and channel change so that this mode is entered
for teletext services that do not transmit TOP or FLOF. Row 24 will be generated internally and will
display coloured links to the stored pages.
Eurotext has two different displays in normal mode. These modes are software selectable.
The operation of the function keys will reflect the display on row 24.
The coloured keys will have either of the following effects:
RED key Page - 1
GREEN key Next Page
YELLOW, CYAN keys No Effect
INDEX key Selects Page 100
or:
RED key Page + 1
GREEN key Page + 2
YELLOW key Page + 3
CYAN key Page + 4
INDEX key Selects Page 100
When the decoder is first powered up, or after a change channel command, one store is programmed
with the page number 1F0.3Fxx(hex). This ensures that if the new channel has a TOP transmission,
the basic TOP table is captured in the shortest possible time. The same store is also used to keep an
inventory of the transmitted pages. An inventory allows efficient use of the memory, as once
complete, capture latches will only be set to pages that are being transmitted. This improves memory
efficiency and user friendliness as the users are prompted with a warning message if they attempt to
select a non-existent page number. Under these circumstances, the message displayed will be the
page number enclosed by ‘>‘ and ‘<‘ symbols shown in flashing red on the header line.
In normal mode, if a page number is already in store, the decoder will enable the next highest page
number which is not in the store, and, if the inventory page is active, the decoder will only search for
pages that are being transmitted.

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
6
2.2 FLOF Mode
The FLOF mode can either be selected manually or may be selected automatically by EUROTEXT if
it is set to AUTO mode. In AUTO mode, the decoder will select FLOF mode if it has received a
valid packet 27 for the display page.
When the EUROTEXT decoder selects FLOF mode, all packets 24, 27 and 8/30 will be processed by
the internal processor as they are received. The decoder will program the memory with the five links
from packet 27 of the display page. Valid links are page numbers 100 to 8FF, links to sub-pages are
not processed. This enables the decoder to implement a full FLOF decoder without any external
control. Packet 24 is displayed on row 24. The decoder will ensure that the link information is kept
live at all times. If a new page is selected that is not in memory, the old link information will remain
valid until the new page is received.
The coloured keys will select the pages as defined in packet 27 of the display page.
On selecting FLOF mode, if packet 27 is not received, the decoder will temporarily return to normal
mode until a valid packet 27 for the display page is received.
2.3 Favourite Page Mode
In this mode, the external microprocessor has full control over which pages are captured in five of
eight page stores. It can enable four favourite pages which will always be stored in memory with
another store being used for the display page. The four stores can be programmed with any page
number between 100 and 8FF. Sub-pages cannot be programmed as favourite pages but the sub-page
mode can be selected which in favourite page mode.
Row 24 is generated internally and will contain the four page numbers displayed in coloured
foreground (red, green, yellow, cyan). The page number will be prefixed by either a ‘P’ or an ‘S’,
depending upon current language. If the display page is the same as one of the favourite page
numbers, the page number in row 24 will appear in reverse video (i.e. the foreground and background
colours will be swapped).
The memory that is not used to store favourite pages will be used to store the last page selected, the
display page minus 1 and will also store either the basic TOP table or will generate an inventory of
the transmitted pages (see section on Normal Mode for a description of the inventory).
The coloured keys will select the following pages:
RED key Favourite Page 1
YELLOW key Favourite Page 2
GREEN key Favourite Page 3
CYAN key Favourite Page 4
INDEX key No action in this mode.

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
7
2.4 TOP Mode
The TOP Mode can either be selected manually or may be selected automatically by EUROTEXT if
it is set to AUTO mode. In AUTO mode, the decoder will select TOP mode if it has received a valid
basic TOP table but has not received a valid packet 27 for the display page.
The EUROTEXT decoder has internal software to implement a TOP decoder without any external
microprocessor control. When TOP mode is selected the decoder will capture and store the basic
TOP table and up to three additional information tables. The TOP tables will be kept updated
automatically. Using the TOP tables, the decoder will automatically generate a row 24 display. The
user will be prompted with a warning message if an attempt is made to select a page which is not in
the transmission cycle, however, Eurotext will search for the selected page.
The coloured and index keys will have the following functions:
RED key This key will operate in one of two modes. It will either search backwards in the
TOP table and select the next page or the function of this key will depend upon the
display page. If a Block Page is displayed, it will select the last Block Page, if a
Group Page is displayed it will select the last Group or Block Page and if a Normal
Page is selected, it will select the last Block, Group or Normal Page.
GREEN key Next Block, Group or Normal Page
YELLOW key This key will operate in one of two modes. It will either search forwards in the TOP
table to find the next Block or Group Page, or it will find the next Group Page in the
current Block wrapping around in the block boundary.
CYAN key Next Block Page
INDEX key TV Block Page/P100. This key will select page 100 unless the display page is page
100 in which case it will select the first TV Block Page.
In all cases, the search for the block page will wrap-around from 899 to 100 and 100 to 899.
In TOP mode the EUROTEXT device uses an intelligent page capture strategy to select which pages
are to be stored in the four TOP stores. To give the user the fastest access to teletext pages, the pages
enabled for capture will depend upon the last page selected. The stores will always be programmed
with different page numbers.

UNIVERSAL TELETEXT DECODERS ‘EUROTEXT’
‘EUROTEXT’ CF70200 CF70200
DRAFT 11 15-Feb-96 1Q96
8
Last Page
Selected Via
TOP1 TOP2 TOP3 TOP4 Depends on
Current Page
Digit entry, RED
Key or TOP
initialisation
Next Block,
Group or Normal
Page
Next Block or
Group Page
Next Block Page
If a block page
then last block
page
Green key or if
current page is in
the TV block
Next Block,
Group or Normal
Page
Next Block,
Group or Normal
Page
Next Block,
Group or Normal
Page
If group page then
last group page
Yellow key Next Block or
Group Page
Next Block or
Group Page
Next Block or
Group Page
If normal page
then last normal
Cyan Key Next Block Page Next Block Page Next Block Page page
Table 3: Page Selected to be Stored in TOP Mode.
TOP4 Page is Only Stored if There are Less than 3 Additional Information Tables
2.5 Sub-Page Mode
Sub-page mode can be selected in any of the four main modes. In sub-page mode the decoder will
capture the display sub-page and the next two sub-pages transmitted for the display page. The row 24
display will show the current page number and the current sub-page number. In addition to the
display number, two boxes will be displayed, one red containing a ‘-’ sign and one green containing a
‘+’ sign. The red and green coloured keys will decrement or increment the sub-page number. The
original functions of the coloured keys will be suspended during this mode but will resume when sub-
page mode is deselected. The original row 24 will be stored in the decoder and will be displayed
immediately the sub-page mode is deselected.