Signal Conditioning By Combining Precursor, Main, and Post Cursor Signals Without A Clock Signal

A serial data interface, comprising:

• an input port and an output port;
• the input port for receiving a transmitted signal;
• the input port coupled to a first delay block and a second delay block for providing the transmitted signal to each thereof;
• a third delay block coupled to the second delay block for receiving the transmitted signal;
• a first output of the first delay block being a precursor signal for emulation of a pre-shoot path;
• a second output of the second delay block being a main signal for emulation of a transition path;
• a third output of the third delay block being a post cursor signal for emulation of pre-emphasis or de-emphasis path;
• wherein the precursor signal and the post cursor signal are for conditioning the main signal to provide a conditioned version of the transmitted signal independently of a clock;
• and
• a combiner circuit to receive and to combine the first output, the second output, and the third output to provide the conditioned version of the transmitted signal to the output port.

A method for a programmable delay filter, comprising:

• obtaining a transmitted signal;
• wave shaping the transmitted signal by:
• buffering the transmitted signal with a buffer to provide a precursor signal;
• first delaying the transmitted signal with a first adjustable delay to provide a main signal;
• wherein the main signal is delayed relative to the precursor signal;
• second delaying the main signal with a second adjustable delay to provide a post cursor signal;
• and
• combining the precursor signal, the main signal, and the post cursor signal to provide an output signal;
• wherein the precursor signal, the main signal, and the post cursor signal are combined independently of a clock signal.