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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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CS4954 Arkusz danych(PDF) 11 Page - Cirrus Logic |
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CS4954 Arkusz danych(HTML) 11 Page - Cirrus Logic |
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11 / 60 page  CS4954 CS4955 DS278F6 11 2. ADDITIONAL CS4954/5 FEATURES • Five programmable DAC output combinations, including YUV and second composite • Optional pseudo-progressive scan @ MPEG2 field rates • Stable color subcarrier for MPEG2 systems • General purpose input and output pins • Individual DAC power-down capability • On-chip color bar generator • Supports RS170A and ITU R.BT601 compos- ite output timing • HSYNC and VSYNC output in ITU R.BT656 mode • Teletext encoding selectable on two composite and S-video signals • Programmable saturation, SCH Phase, hue, brightness and contrast • Device power-down capability • Super White and Super Black support 3. CS4954 INTRODUCTION The CS4954/5 is a complete multi-standard digital video encoder implemented in current CMOS tech- nology. The device can operate at 5 V as well as at 3.3 V. ITU R.BT601- or ITU R.BT656-compliant digital video input is converted into NTSC-M, NTSC-J, PAL-B, PAL-D, PAL-G, PAL-H, PAL-I, PAL-M, PAL-N, or PAL-N Argentina-compatible analog video. The CS4954/5 is designed to con- nect, without glue logic, to MPEG1 and MPEG2 digital video decoders. Two 10-bit DAC outputs provide high quality S- Video analog output while another 10-bit DAC si- multaneously generates composite analog video. In addition, there are three more DACs to provide si- multaneous analog RGB or analog YUV outputs. The CS4954/5 will accept 8-bit YCbCr or 8-bit YUV input data. The CS4954/5 is completely configured and con- trolled via an 8-bit host interface port or an I²C compatible serial interface. This host port provides access and control of all CS4954/5 options and fea- tures, such as closed caption insertion, interrupts, etc. In order to lower overall system costs, the CS4954/5 provides an internal voltage reference that eliminates the requirement for an external, dis- crete, three-pin voltage reference. In ISO MPEG-2 system configurations, the CS4954/5 can be augmented with a common color- burst crystal to provide a stable color subcarrier given an unstable 27 MHz clock input. The use of the crystal is optional, but the facility to connect one is provided for MPEG-2 environments in which the system clock frequency variability is too wide for accurate color sub-carrier generation. 4. FUNCTIONAL DESCRIPTION In the following subsections, the functions of the CS4954/5 will be described. The descriptions refer to the device elements shown in the block diagram on the cover page. 4.1 Video Timing Generator All timing generation is accomplished via a 27 MHz input applied to the CLK pin. The CS4954/5 can also accept a signal from an optional color burst crystal on the XTAL_IN & XTAL_OUT pins. See the section, Color Subcarri- er Synthesizer, for further details. The Video Timing Generator is responsible for or- chestrating most of the other modules in the device. It operates in harmony with external sync input timing, or it can provide external sync timing out- puts. It automatically disables color burst on appro- priate scan lines and automatically generates serration and equalization pulses on appropriate scan lines. |
Podobny numer części - CS4954 |
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Podobny opis - CS4954 |
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