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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST92195D Scheda tecnica(PDF) 86 Page - STMicroelectronics |
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ST92195D Scheda tecnica(HTML) 86 Page - STMicroelectronics |
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86 / 249 page  86/249 ST92195C/D - TELETEXT DISPLAY STORAGE RAM INTERFACE 7.3 TELETEXT DISPLAY STORAGE RAM INTERFACE 7.3.1 Introduction The Teletext Display RAM (TDSRAM) is used to hold the Teletext data for display. It can be shared by the following units: – Acquisition Unit (AQD). A buffer containing the teletext data extracted by the slicer from the in- coming Composite Video signal CVBS1. – Display Unit (DIS). This OSD generator is de- scribed in a separate chapter. – 40-byte buffer unit (MBT). A register mapped buffer that can be directly accessed by the CPU. – CPU accesses for control. The necessary time slots are provided to each unit for realtime response. FEATURES: s Memory mapped in CPU Memory Space s Direct CPU access without significant slowdown s 3 types of on-chip hardware DMA s Row-wise DMA for high speed data treatment (bufferized 40-byte read - write) Figure 47. General Block Diagram |
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