Abstract: An embodiment of the invention discloses phase shifting a second clock signal by a phase increment with respect to a first clock signal, where the first clock signal and the second clock signal have the same periods. The first clock signal is sampled with the second clock signal, and the output of the sample indicates whether the sample of the first clock signal is at a logic one state or a logic zero state. A count of logic one samples is incremented if the sample of the first clock signal is at a logic one state. The process of phase shifting the second clock signal and sampling the first clock signal is repetitively performed to a maximum number of samples.

Abstract: An embodiment of the invention discloses phase shifting a second clock signal by a phase increment with respect to a first clock signal, where the first clock signal and the second clock signal have the same periods. The first clock signal is sampled with the second clock signal, and the output of the sample indicates whether the sample of the first clock signal is at a logic one state or a logic zero state. A count of logic one samples is incremented if the sample of the first clock signal is at a logic one state. The process of phase shifting the second clock signal and sampling the first clock signal is repetitively performed to a maximum number of samples.

Abstract: A system is described that includes an arithmetic logic unit that senses the presence of a circuit module in a connector, wherein one type of circuit module, if present, automatically provides a set of signals on a predetermined pin set that indicates characteristics of the circuit module. The system also includes circuitry that enables the determination of the presence of other types of pluggable circuit modules in the connector. The circuitry comprises a latch circuit for holding a received address for the circuit module. In the received address, a preset field of bits is present which identifies a field in a status register. The status register stores n fields of information defining the characteristics of the pluggable circuit module and is responsive to the preset field of bits to provide signals on the predetermined pin set indicating the information.