Clock skew removal apparatus

Digital clock deskew apparatus for synchronising a phase of a first clock signal, with a phase of a second clock signal which includes an unknown phase delay, said deskew apparatus comprising:

• a tapped delay line connected to receive said first clock signal and comprising a plurality of delay elements each applying a respective delay to said first clock signal and outputting a respective delayed clock signal;
• selector apparatus for selecting one of the respective delayed clock signals in response to a count signal;
• phase detector apparatus for comparing a phase of the selected delayed clock signal with the phase of said second clock signal and outputting control signals to control selection of the delayed clock signal having a predetermined phase relationship with the phase of said second clock signal to thereby accommodate for the unknown phase delay;
• and
• a counter for receiving said control signals and having a clock input terminal which receives the selected delayed clock signal to thereby clock the counter;
• whereby
• the counter provides the count signal indicating the respective delayed clock signal which is to be selected.