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GS3470 Datasheet(PDF) 29 Page - Semtech Corporation |
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GS3470 Datasheet(HTML) 29 Page - Semtech Corporation |
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29 / 169 page  GS3470 Final Data Sheet Rev.8 PDS-060500 September 2017 29 of 169 Semtech www.semtech.com 4.9.3 Parallel Output in DVB-ASI Mode The DVB-ASI mode of the GS3470 is enabled when the SMPTE_BYPASS bit is LOW and the DVB_ASI bit is HIGH. The extracted 8-bit data is presented on DOUT[17:10] such that DOUT[17:10] = HOUT ~ AOUT, where AOUT is the least significant bit of the decoded transport stream data. In addition, the DOUT19 and DOUT18 pins are configured as DVB-ASI status signals WORDERR and SYNCOUT respectively. SYNCOUT is HIGH whenever a K28.5 sync character is output from the device. WORDERR is HIGH whenever the device has detected a running disparity error or illegal code word. DOUT[9:0] is forced LOW, when the GS3470 is operating in DVB-ASI mode. The clock is either at the 10-bit word rate or at half of this rate (DDR mode). 4.9.4 Parallel Output in Data-Through Mode This mode is enabled when the SMPTE_BYPASS and DVB_ASI bits are LOW. In this mode, data is passed to the output bus without any decoding, descrambling, or word-alignment. GSPI can be used to set the output data width to either 10-bit or 20-bit, adjust the drive strength of the outputs and enable DDR mode. The output data width (10-bit or 20-bit) can also be controlled through the 20BIT_10BIT pin. 4.9.5 Parallel Output Data Format Clock/PCLK Settings The PCLK output frequency of the GS3470 is determined by the output data format. Table 4-5 lists the output signal formats according to the external selection pins for the GS3470. Table 4-5: GS3470 Output Data Formats Pin/CSR Bit Settings Output Data Format PCLK Rate 20BIT/ 10BIT SD/HD 3G/HD SMPTE_ BYPASS DVB-ASI SD_HD_ DDR_SEL HIGH LOW HIGH HIGH LOW LOW 20-bit 3G format 148.5 or 148.5/1.001MHz HIGH LOW HIGH LOW LOW LOW 20-bit data output 148.5 or 148.5/1.001MHz HIGH LOW LOW HIGH LOW LOW 20-bit HD format 74.25 or 74.25/1.001MHz |
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