The Demo version of SS_App_Core for ADSP-SC58x EZ board supports only 48k sampling rate.
Is it possible to modify the code to support 96k and 192k as well? If YES, how can it be done?
Or is another example available where the support already exist?
The master clock 24.576 Mhz is connected to ADAU1962A_CLKIN and available in DAI1_PIN03 also.
You can refer ADSP-SC589 Example demo application project "SS_App_Core0" - system.svc - Signal Routing…
There is no example available with 96K or 192K sample rate. You need to modify the example demo application to 96K or 192K based on your requirement. Please refer the following information's how to modify the example demo application,
1. The maximum clock range is 24.567MHz in ADSP-SC5xx EZ board, please refer corresponding EZ board harware schematic. You can find the EZ board harware schematic from "https://www.analog.com" by entering processor name as keyword in search. e.g. ADSP-SC589
The maximum Channels support are,
48K - TDM16
96K - TDM8
192K - TDM4
2. Modify the SigmaStudio schematic sampling rate to 96K or 192K. Modify the framwork configuration for the SPORT by considering maximum channel support possible with chosen FW sample rate.
3. Modify the number of channels support in FW application function AudioIoPcgInit() in file adi_ss_fw_audioIO.c
4. Modify the sample rate support and configurations of ADC and DAC with respect to sample rate. Go through the function adi_ss_system_initialize() in file adi_ss_app_system.c. The ADC and DAC configuration can be done by referring data sheet. You can find the datasheet from "">https://www.analog.com" by entering ADC or DAC name as keyword in search. e.g. ADAU1979 or ADAU1966A
5. You can verify the FW modification by running application in CCES debug session with build configuration as Debug.
6. If all configurations is fine then run application and download SigmaStudio schematic.
A question about channel support and TDM:
I need 1 analog stereo in, 1 spdif stereo in, and 2 analog stereo out.
Does TDM4 mean 4 total channels, counting both inputs AND outputs?
I do not need both analog and spdif inputs simultaneously.
Will I be able to cover my channel needs using 192k TDM4?
How can I disable the channels I don't need to get sufficient resources?
Thanks for the advice.
I tried the BRKOUT board and found some signals.
I now realise that the SPORT pin assignments shown on the schematics are not necessarily true, only the DAIn_PINn are fixed properties. The SPORT functional pin assignments such as CLK, D0, etc. are set by the SRU config. Is this a correct conclusion?
I have seen data on the DAI pins involved in the audio input and output at 96k, as well as on the analog output.
When testing the 192k configuration, there were data on the same pins there also, but no analog.
I have problem locating the pins for SCLK and FSCLK signals. Are they PGC0_CLKC_O and PGC0_FSC_O as seen in the SRU? If they are, they exist and for 192k config they are 24.575MHz and 192kHz respectively.However, no analog output.
I measured the signals at the 74CBTLV3244 bus switch (according to the schematic), both at 96k and 192k.
1A1 96k: 12MHz clock, 192k: 24MHz clock
1A2 96k: 96k sync, 192k: 192k sync
1A3 96k: data present, 192k: data present
1A4 96k: quiet, 192k: quiet
2A1 96k:12Mhz clock, 192k: 24MHz clock
2A2 96k:96k sync, 192k:192k sync
2A3: 96k: data, 192k: data
2A4: 96k: quiet, 192k: quiet
So the main signals are getting thru, but no analog out for 192k. Of course, there are more pins than these, but they are not as easy to find and measure.
I am now trying to study the signal routing of the Playback Demo. In the "ascii-graphic schematic" in the project Readme I can see that the main 25.47MHz clock is connected to DAI03, but there are no connections to DAI03 in the SRU. If I measure with oscilloscope, it is there.
Could you please comment on this?
You can refer ADSP-SC589 Example demo application project "SS_App_Core0" - system.svc - Signal Routing Unit - Routing details for how the master clock used in application FW.
DAI1_PBEN03_I - DAI1_LOW (To configure DAI1_PIN03 as Input pin)
DAI1_CRS_PB03_O - PCG0_EXTCLKA_I (Mater clock connected as external input to PCG A for generating I2S CLK and FS. The DAI PIN 3 and PIN 4 have cross connection option to get Signal to other DAI group pins and PCGs)
DAI1_PB03_O - PCG0_EXTCLKC_I (Mater clock connected as external input to PCG C for generating TDM CLK and FS)
There after the SCLK and FSCLK connected to other peripherals from respective PCG's.