Daewoo DTR Series Dokumentacja Pobierz pdf (Strona 12)

DW5255MBI

(TVTEXT 8-bit Micro controller, Rom-version)

=SDA5254 (SIEMENS Type No.)

(1) General Description

The SDA 525x contains a slicer for TTX, VPS and WSS, an accelerating acquisition hardware modul, a display gener-

ator for “Level 1” TTX data and an 8 bit microcontroller running at 333 ns cycle time. The controller with dedicated hard-

ware guarantees flexibility, does most of the internal processing of TTX acquisition, transfers data to/from the external

memory interface and receives/transmits data via I

C and UART user interfaces. The block diagram shows the internal

organization of the SDA 525x. The Slicer combined with dedicated hardware stores TTX data in a VBI buffer of 1 Kbyte.

The microcontroller firmware does the total acquisition task (hamming- and parity-checks, page search and evaluation

of header control bits) once per field.

(2) Feature

•

Acquisition:

- Feature selection via special function register

- Simultaneous reception of TTX, VPS and WSS

- Fixed framing code for VPS and TTX

- Acquisition during VBI

- Direct access to VBI RAM buffer

- Acquisition of packets X/26, X/27, 8/30 (firmware)

- Assistance of all relevant checks (firmware)

- 1-bit framing code error tolerance (switchable)

•

Display:

- Features selectable via special function register

- 50/60 Hz display

- Level 1 serial attribute display pages

- Blanking and contrast reduction output

- 8 direct addressable display pages for SDA 5250, SDA 5254 and SDA 5255

- 1 direct addressable display pages for SDA 5251 and SDA 5252

- 12 x 10 character matrix

- 96 character ROM (standard G0 character set)

- 143 national option characters for 11 languages

- 288 characters for X/26 display

- 64 block mosaic graphic characters

- 32 characters for OSD in expanded character ROM + 32 characters inside OSD box

- Conceal/reveal

- Transparent foreground/background - inside/outside of a box

- Contrast reduction inside/outside of a box

- Cursor (colour changes from foreground to background colour)

- Flash (flash rate 1s)

- Programmable horizontal and vertical sync delay

- Full screen background colour in outer screen

- Double size / double width / double height characters

•

Synchronization:

- Display synchronization to sandcastle or Horizontal Sync (HS) and Veritical Sync (VS) with start-stop-oscillator

- Independent clock systems for acquisition, display and controller

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Daewoo DTR Series Dokumentacja Strona 12

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