Notes on codec-related modules:

(1) Codec-based modules in this directory all assume that the XS40 clock
frequency is 12 MHz. Use GXSSETCLK to adjust your XS40 to 12 MHz (use a 
clock divisor of 8), or ensure that your own system feeds a 12MHz clock to
the codec.

(2) The more recent demos use the XStend "RESET" button, earlier demos
use bit zero of XSPORT.