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VSP9445B Datasheet(PDF) 9 Page - Micronas |
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VSP9445B Datasheet(HTML) 9 Page - Micronas |
9 / 126 page DATA SHEET VSP 94x2A Micronas Aug. 16, 2004; 6251-552-1DS 9 2.1.4. Synchronization After elimination of the high frequent components of the CVBS signal by a low pass filter, horizontal and vertical sync pulses are separated. Horizontal sync pulses are generated by a digital phase locked loop. The time constant can be adjusted between fast and slow behavior in four steps (PLLTC) to accommodate different input sources (e.g. VCR). The time-constant can be changed during normal operation without visi- ble picture degradation. A fine tuning of the PLL time constant can be done by NSRED. Additional weak input signals from a satellite dish (’fish’) become more stable when SATNR is enabled. Vertical sync pulses are separated by integration of equalizing pulses. A vertical flywheel mode improves vertical sync separation for weak signals (VFLYWHL, VFLYWHLMD ). Additionally, v-syncs may be gated by VTHRL and VTHRH to reject invalid v-syncs (independently adjust- able for 50 and 60 Hz sources) if no input signal is con- nected the device switches to a freeruning mode. The device can be configured to switch-on background color when no or only a weak signal is applied (NOS- IGB ). 50 Hz or 60 Hz operation for sync separation may be forced separately or selected to work automat- ically (FLNSTRD). 2.1.5. Chroma Decoder The digital multistandard chroma decoder is able to decode NTSC and PAL signals with a subcarrier fre- quency of 3.58 MHz and 4.43 MHz (PAL B*/N/ 60†,NTSC M/4.4) as well as SECAM signals with auto- matic standard detection. Alternatively a standard can be forced. The demodulation is done with a regener- ated color-carrier. To enable a factory adjustment of the crystal frequency, the frequency of the regenerated subcarrier can be adjusted via SCADJ. For this pur- pose the crystal deviation (SCDEV) can be read out via I2C after chroma PLL locking (indicated by SCOUTEN ) and can be stored in µC ROM for SCADJ. For test purposes, CPLLOF allows the opening of the chroma PLL loop. For adjustment to the specific operational area an automatic norm detection is selectable. Available 50 Hz color standards are PAL B, PAL N and SECAM. Available 60 Hz color standards are NTSC M, PAL M, PAL60 and NTSC44. For each line standard, one or more color standards can be enabled for automatic chroma standard detection. Please refer to Table 2– 3: and Table 2–4: for allowed combinations. The standard detection process can be set to slow or fast behavior (LOCKSP). In slow behavior, 25 fields are used to detect the standard, whereas 15 fields are used in fast behavior. If the detection was not success- ful during this time frame, the system will switch to the next enabled TV Standard. Table 2–2: Clamping Adjustment Signal Description CLMPST1 Measurement pulse start for ADC1 CLMPD1 Measurement pulse duration for ADC1 CLMPST1S Clamping pulse start for ADC1 CLMPD1S Clamping pulse duration for ADC1 CLMPST2 (Measurement pulse start for ADC2) CLMPD2 (Measurement pulse duration for ADC2) CLMPST2S Measure and clamp start for RGBF-ADC (clamping start for ADC2) CLMPD2S Measure and clamp duration for RGBF-ADC (clamping duration for ADC2 * PAL B is representative for PAL B/G/H/I/N † PAL60 and NTSC44 are nonstandard signals which are generated by some VCR or DVD player |
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