TDA9381PSSLASHN2 datasheet(40/118 Pages) PHILIPS

40 / 118 page

2001 Jan 18

Philips Semiconductors

Tentative Device Speciﬁcation

TV signal processor-Teletext decoder with

embedded

µ-Controller

TDA935X/6X/8X PS/N2 series

teletext decoder is error checked and stored in row 25,

block 9 of the basic page memory. The device

automatically detects whether teletext or VPS is being

transmitted on this line and decodes the data

appropriately.

Each VPS byte in the memory consists of 4 bi-phase

decoded data bits (bits 0-3), a bi-phase error flag (bit 4)

and three 0s (bits5-7). The TXT13. VPS Received bit is set

by the hardware whenever VPS data is acquired. The flag

can be reset by writing a 0 into the SFR bit.

WSS ACQUISITION

The Wide Screen Signalling data transmitted on line 23

gives information on the aspect ratio and display position

of the transmitted picture, the position of subtitles and on

the camera/film mode. Some additional bits are reserved

for future use. A total of 14 data bits are transmitted. All of

the available data bits transmitted by the Wide Screen

Signalling signal are captured and stored in SFRs WSS1,

WSS2 and WSS3. The bits are stored as groups of related

bits and an error flag is provided for each group to indicate

when a transmission error has been detected in one or

more of the bits in the group. Wide screen signalling data

is only acquired when the TXT8.WSS ON bit is set. The

TXT8.WSS RECEIVED bit is set by the hardware

whenever wide screen signalling data is acquired. The flag

can be reset by writing a 0 into the SFR bit.

CLOSED CAPTION ACQUISITION

The US Closed Caption data is transmitted on line 21 (525

line timings) and is used for Captioning information, Text

information and Extended Data Services. Closed Caption

data is only acquired when TXT21.CC ON bit is set.

Two bytes of data are stored per field in SFRs, the first bye

is stored in CCDAT1 and the second byte is stored in

CCDAT2. The value in the CCDAT registers are reset to

00h at the start of the Closed Caption line defined by

CCLIN.CS<4:0>. At the end of the Closed Caption line an

interrupt is generated if IE.ECC is active.

The processing of the Closed Caption data to convert into

a displayable format is performed by Software.

DISPLAY

The display section is based on the requirements for a

Level 1.5 WST Teletext and US Closed Caption. There are

some enhancements for use with locally generated

On-Screen Displays.

The display section reads the contents of the Display

memory and interprets the control/character codes. Using

this information and other global settings, the display

produces the required RGB signals and Video/Data (Fast

Blanking) signal for the TV signal processing.

The display is synchronised to the TV signal processing by

way of Horizontal and Vertical sync signals generated

within TDA935X/6x/8x. From these signals all display

timings are derived.

Display Features

• Teletext and Enhanced OSD modes

• Level 1.5 WST features

• US Closed Caption Features

• Serial and Parallel Display Attributes

• Single/Double/Quadruple Width and Height for

characters

• Scrolling of display region.

• Variable flash rate controlled by software.

• Globally selectable scan lines per row 9/10/13/16.

• Globally selectable character matrix (HxV) 12x9, 12x10,

12x13, 12x16.

• Italics, Underline and Overline.

• Soft Colours using CLUT with 4096 colour palette.

• Fringing (Shadow) selectable from N-S-E-W direction.

• Fringe colour selectable.

• Meshing of defined area.

• Contrast reduction of defined area.

• Cursor.

• Special Graphics characters with two planes, allowing

four colours per character.

• 32 Software re-definable On-Screen Display characters.

• 4 WST Character sets(G0/G2) in single device (e.g.

Latin,Cyrillic,Greek,Arabic).

• G1 Mosaic graphics, Limited G3 Line drawing

characters.

• WST Character sets and Closed Caption Character set

in single device.

Display Modes

The display section has two distinct modes with different

features available in each. The two modes are:

Fig.13 VPS Data Storage

Teletext page

header data

VPS

byte 11

VPS

byte 12

VPS

byte 13

VPS

byte 14

VPS

byte 15

VPS

byte 4

VPS

byte 5

9 10

121314

15 16 171819 20 21

22 23

column

row 25

TDA9381PS/N2 Datasheet(PDF) 40 Page - NXP Semiconductors

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