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SDA5255 Datasheet(PDF) 5 Page - Siemens Semiconductor Group |
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SDA5255 Datasheet(HTML) 5 Page - Siemens Semiconductor Group |
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5 / 143 page  SDA 525x Semiconductor Group 5 1998-04-08 1 General Description The SDA 525x contains a slicer for TTX, VPS and WSS, an accelerating acquisition hardware modul, a display generator for “Level 1” 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 2C 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 Features 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 page for SDA 5251 and SDA 5252 • 12 × 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) |
Número de pieza similar - SDA5255 |
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Descripción similar - SDA5255 |
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