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WM8802SCFV 数据表(PDF) 32 Page - Wolfson Microelectronics plc |
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WM8802SCFV 数据表(HTML) 32 Page - Wolfson Microelectronics plc |
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32 / 65 page  WM8802 Product Preview w PP Rev 1.1 April 2004 32 IEC61937, DTS-CD/LD DETECTION FLAG OUTPUT A function to output IEC61937 and DTS-CD/LD detection flags for non-PCM data is provided. When the UNPCM non-PCM signal output setting is selected, as well as an indication on the AUDIO pin, an interrupt signal is output from INT upon detection of an IEC61937 or DTS-CD/LD sync signal. Non-PCM signal details can be known by reading this information from the output register. The IEC61937 sync signal is detected and output when channel status bit 1 is non-PCM data ("1"). The IEC61937 sync signal is not output if bit 1 is PCM data (“0”). DTS-CD/LD sync signal detection is done based on the sync pattern and the base frequency. In the case of DTS-ES data detection, output is performed when the DTS5.1 channel sync signal is detected and the DTS-ES sync pattern has been verified. The IEC61937 and DTS-CD/LD detection flags are cleared when fs has changed or upon occurrence of a PLL lock error or data error. Since the DTS sync signal is provided within the audio data, digital data with the same code as the DTS sync signal may in rare cases exist for regular CD/LD records that are not recorded in the DTS format. Protection using the sync pattern or base frequency is provided so that such data is not misinterpreted as DTS-CD/LD detection flags. The detection sequence is shown below. Frame counter reset NO YES YES NO YES NO YES NO NO YES Input data DTS-CD/LD SYNC detection * * DTS-CD/LD data hold Frame counter start YES NO NO YES PaPb detection Bit 1 detection Bit 1 = 1 PaPb detection during 4096 frames IEC61937 flag OK INT lowered IEC61937 flag IEC61937 data hold * Depending on the frame count, the subsequent detection count is expanded up to x2. Periodic fluctuation is supported. Frame count 512, 1024, 2048, 4096 SYNC detection Frame count hold x2 count detection expansion DTS-CD/LD flag OK INT lowered DTS-CD/LD flag not valid INT lowered Frame counter reset Frame counter start PaPb detection during 4096 frames 512 => 512 or 1024 1024 => 1024 or 2048 2048 => 2048 or 4096 4096 => 4096 1st count 2nd count Frame count 512, 1024, 2048, 4096 SYNC detection Figure 24 Detection Flag Output Flowchart |
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