MUX select control of two phase shifted data in write precompensation

A disk drive system, comprising:

• at least one magnetic media disk;
• a precompensation circuit configured to generate an output data signal to be written on a surface of the magnetic media disk, the precompensation circuit comprising,
• a rising edge interpolator circuit configured to generate a phase shifted rising edge data signal by phase shifting an input data signal;
• a falling edge interpolator circuit configured to generate a phase shifted falling edge data signal by phase shifting the input data signal;
• a multiplexer circuit coupled with the rising edge interpolator circuit and with the falling edge interpolator circuit to multiplex the phase shifted rising edge data signal and the phase shifted falling edge data signal into an output data signal responsive to a select signal received at a select input of the multiplexer circuit;
• and
• a control circuit coupled with the select input of the multiplexer circuit to control production of the output data signal,
• wherein the control circuit is further coupled with both the rising edge interpolator circuit and the falling edge interpolator circuit to change the select signal to the multiplexer circuit at times determined by both the phase shifted rising edge data signal and the phase shifted falling edge data signal;
• and
• a read/write head configured to write the output data signal onto the surface of the magnetic media disk.

A method, comprising:

• generating, through a rising edge interpolator circuit, a phase shifted rising edge data signal by phase shifting an input data signal;
• generating, through a falling edge interpolator circuit, a phase shifted falling edge data signal by phase shifting the input data signal;
• generating, through a control circuit, a select signal for a multiplexer circuit based on both the phase shifted rising edge data signal and the phase shifted falling edge data signal;
• and
• multiplexing, through the multiplexer circuit, the phase shifted rising edge data signal and the phase shifted falling edge data signal into an output data signal responsive to the select signal, the output data signal operable to precompensate the input data signal for writing onto a magnetic storage medium.