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CS4237B Datasheet(PDF) 67 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 67 Page - Cirrus Logic |
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67 / 114 page  Lower Channel Status (C5) D7 D6 D5 D4 D3 D2 D1 D0 CS9 CS8 CS5 CS4 CS3 CS2 CS1 res res Reserved. Must write 0. Could read as 0 or 1. CS1 Channel Status bit 1: Audio. When clear, indicates that the transmitted data is digital audio and suitable for conversion to an analog signal. 0 - Digital Audio 1 - Non-Audio Data CS2 Channel Status bit 2: Copy/Copyright This bit, along with the L bit and the category codes, form the SCMS copy protection scheme. 0 - copy inhibited/copyright asserted 1 - copy permitted/copyright not asserted. CS4, CS3 Channel Status bits 4,3: Pre-emphasis 00 - None 01 - 50/15 µs - 2 channel audio CS5 Channel Status bit 5: Lock 0 - Source Fs Locked 1 - Source Fs Unlocked. CS8, CS9 The first two bits of the Category code. See the next register description for more details. NOTE: More information on copy protection can be found in the Sanchez AES paper titled An Under- standing and Implementation of the SCMS Serial Copy Management System for Digital Audio Trans- mission. Upper Channel Status (C6) D7 D6 D5 D4 D3 D2 D1 D0 CS25 CS24 CS15 CS14 CS13 CS12 CS11 CS10 CS8-CS14 Category Code channel status bits. Note: CS8 and CS9 are in the pre- vious register. These bits define the type of product transmitting and are used in the SCMS copy protection scheme to interpret the L bit. 0000000 - General 0000001 - Experimental 0001xxx - Solid State Memory 001xxxx - Broadcast 010xxxx - Digital/Digital Converters 01100xx - ADCs w/o copy protection 01101xx - ADCs with copy protection 0111xxx - Broadcast 100xxxx - Laser-Optical 101xxxx - Musical Instruments 110xxxx - Magnetic Tape or Disk 111xxxx - Reserved. CS15 L or Generation Status. This bit changes polarity based on the cate- gory codes above. For most categories: 0 - No indication, 1st generation or higher. 1 - Original/Commercially pre- recorded data. The above definition is reversed for category codes: 001xxxx - Broadcast 0111xxx - Broadcast 100xxxx - Laser-Optical CS25, CS24 Channel Status bits 25, 24. Sample frequency. 00 - 44.1 kHz Sample Frequency. This is the only Fs supported. Reserved (C7) D7 D6 D5 D4 D3 D2 D1 D0 res res res res res res res res res Reserved. Must write 0. Could read as 0 or 1. DS213PP4 CS4237B 67 |
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