SDA 525X-2

Semiconductor Group

4

1998-10-08

1

General Description

As its predecessors SDA 525x the SDA 525x-2 contains a slicer for VPS and TTX, an

accelerating acquisition hardware module, a display generator for “Level 1.5” TTX data,

and an 8 bit microcontroller running at 333 ns cycle time. The controller with dedicated

hardware 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

user interface. The block diagram shows the internal organization of the SDA 525x-2.

The slicer combined with dedicated hardware stores TTX data in a VBI buffer of

746 Byte. The microcontroller firmware performs all the acquisition tasks (hamming- and

parity-checks, page search and evaluation of header control bits) once per field.

This delta specification describes the differences of the SDA 525x-2 compared to the

SDA 525x as described in the preliminary data sheet 1997-09-01.

2

Complete Feature List Including

New Features

New features compared to SDA 525x-Specification, version 06/96 are printed in

italic

SDA 525x and the SDA 525x-2 will

• 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

(optional 100 Hz)

– Level 1.5 serial attribute display pages

– Blanking and contrast reduction output

– 8 direct addressable display pages for SDA 5250-2, SDA 5254-2 to SDA 5257-2

(optional 10 pages)

– 1 direct addressable display page for SDA 5251-2 to SDA 5253-2

– 12

× 10 character matrix

– 96 character ROM (standard G0 character set)

–

– 288 characters for X/26 display

– 64 block mosaic graphic characters

– 32 characters for OSD in expanded character ROM + 32 characters

inside OSD box