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GS9090B Datasheet(PDF) 39 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 39 Page - Gennum Corporation |
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39 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 39 of 71 3.9.6.1 Data Format Indication The GS9090B can extract the data format being carried on the serial digital interface (i.e. SDTI, SDI, or DVB-ASI). This information is represented by bits 0 to 3 of the DATA_FORMAT register (Table 3-7). DATA_FORMAT[3:0] register codes are shown in Table 3-10. The DATA_FORMAT[3:0] register defaults to Fh (undefined) after a system reset. The register will also be set to its default value if the device is not locked (LOCKED = LOW), or if both SMPTE_BYPASS and DVB_ASI pins are LOW. 3.9.7 Error Detection and Indication The GS9090B contains a number of error detection functions to enhance operation of the device when operating in SMPTE mode. These functions, except lock error detection, will not be available in DVB-ASI mode (Section 3.7) or Data-Through mode (Section 3.8). The ERROR_STATUS register is at address 01h (Table 3-11). All bits, except the LOCK_ERR bit, will be cleared at the start of each video field or when read by the host interface, whichever condition occurs first. All bits, with the exception of the LOCK_ERR, will also be cleared if a change in the video standard is detected, if the device loses lock to the input data stream (LOCKED = LOW), or if the SMPTE_BYPASS pin is asserted LOW. The ERROR_STATUS register, including the LOCK_ERR bit, will be set LOW during a system reset (RESET = LOW). Table 3-10: Data Format Register Codes Data Format[3:0] Data Format Applicable Standards 0h SDTI DVCPRO - No ECC SMPTE 321M 1h SDTI DVCPRO - ECC SMPTE 321M 2h SDTI DVCAM SMPTE 322M 3h SDTI CP SMPTE 326M 4h Other SDTI fixed block size – 5h Other SDTI variable block size – 6h SDI – 7h DVB-ASI – 8h ~ Eh Reserved – Fh Unknown data format – |
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