hello, I am test ing a audio project at Xinlinx FPGA, but now I am meeting a problem, anyboday know how to modify the ac97 chip lm4550's DAC's sample rate, according to spec, I enable the register 2A, and also set the corresponding sample value at register 2C in my verilog code, but the sample rate seems has no change, I am confused at this problem, anybody can help me?