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CS8416-DNZ Datasheet(PDF) 25 Page - Cirrus Logic |
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CS8416-DNZ Datasheet(HTML) 25 Page - Cirrus Logic |
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25 / 60 page  DS578F3 25 CS8416 7.1 Slip/Repeat Behavior When using the serial audio output port in slave mode with an OLRCK input that is asynchronous to the incoming AES3 data, the interrupt bit OSLIP (bit 5 in the Interrupt 1 Status register, 0Dh) is provided to in- dicate when repeated or dropped samples occur. Refer to Figure 8 for the AES3 data format diagram. When the serial output port is configured as slave, depending on the relative frequency of OLRCK to the input AES3 data (Z/X) preamble frequency, the data will be slipped or repeated at the output of the CS8416. After a fixed delay from the Z/X preamble (a few periods of the internal clock, which is running at 256Fs), the circuit will look back in time until the previous Z/X preamble and check which of the following conditions occurred: 1. If during that time, the internal data buffer was not updated, a slip has occurred. Data from the previous frame will be output and OSLIP will be set to 1. Due to the OSLIP bit being “sticky,” it will remain 1 until the register is read. It will then be reset until another slip/repeat condition occurs. 2. If during that time the internal data buffer did not update between two positive or negative edges (de- pending on OLRPOL) of OLRCK, a repeat has occurred. In this case, the buffer data was updated twice, so the part has lost one frame of data. This event will also trigger OSLIP to be set to 1. Due to the OSLIP bit being “sticky,” it will remain 1 until the register is read. It will then be reset until another slip/repeat condition occurs. 3. If during that time, it did see a positive edge on OLRCK (or negative edge if the SOLRPOL is set to 1) no slip or repeat has happened. Due to the OSLIP bit being “sticky,” it will remain in its previous state until either the register is read or a slip/repeat condition occurs. If the user reads OSLIP as soon as the event triggers, over a long period of time the rate of occurring INT will be equal to the difference in frequency between the input AES data and the slave serial output LRCK. The CS8416 uses a hysteresis window when a slip/repeat event occurs. The slip/repeat is triggered when an edge of OLRCK passes a window size from the beginning of the Z/X preamble. Without the hysteresis window, jitter on OLRCK with a frequency very close to Fs could slip back and forth, causing multiple slip/re- peat events. The CS8416 uses a hysteresis window to ensure that only one slip/repeat happens even with jitter on OLRCK Figure 8. AES3 Data Format X Channel A Data Y Channel B Data Z Y X Y Channel A Data Channel B Data Channel A Data Channel B Data Frame 191 Frame 0 Frame 1 Preambles OLRCK (in slave mode) |
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