XCore Exchange

My question is is it possible to have the xmos xcore-200 MC audio board take 49.152Mhz to MCLK_XCORE, AUDIO_MCLK, MCLK_SPDIF? The Hardware manual of the board just states that there is a need for 24Mhz input on the M_CLK, but then on the clocking sheet there are 2 other clocks which can be used 24.576 MHz (FSEL high) or 22.5792MHz (FSEL low). 24Mhz is needed for USB applications so I have kept that, But I have replaced the circuit with a single oscillator which is providing 24 to the XMOS and 42.152 to another chip (also has one more currently unused programmable out).

49.152MHz MCLK is no problem. In fact, you can generate it from the board without any HW mods.

Change the following in customdefines.h:
from: to:
Add the following flag to the Makefile:
What this does is switch over to the CS2100, configure it, and supply a 1MHz clock from an xcore port to the input of the CS2100 which then multiplies it up. Checkout audiohw.xc for the relevant setup, guarded with USE_FRACTIONAL_N conditional compilation.

Great I will attempt this. Thaanks. How about when i am using this setup


Do i just go with the makefile option as there is no CS2100.

Ah OK - so it's just literally a change in MCLK. So all you need to change is:

1) Relevant I2C setup for your device to get the MCLK set

2) Tell the software that the MCLK is different

#define MCLK_441 (1024*44100) /* 44.1, 88.2 etc */
#define MCLK_48 (1024*48000) /* 48, 96 etc */

Awesome. Amazing help again, thanks