Abstract: The present invention relates to an asynchronous data buffer for transferring m data elements of a burst-transfer between two asynchronous systems. The asynchronous data buffer comprises a data memory for storing m data elements of a data burst and a valid bit memory for storing m input valid bits corresponding to the m data elements. Input control logic circuitry generates the m input valid bits and controls storage of the same and the m data elements. After storage of the m input valid bits an input control signal is provided for inverting the input valid bits of a following data burst. Therefore, after each burst-transfer of m data elements the input valid bit is inverted, automatically rendering all data elements of a previous burst-transfer invalid.

Abstract: The present invention relates to a 4-level logic decoder for decoding n 4-level input data signals into n 2-bit signals. The 4-level logic decoder comprises n decoding circuits with each decoding circuit comprising comparison circuitries for comparing the 4-level input data signal with a clock signal and a one-bit data signal. In dependence upon the comparison results signals are provided to a decode logic circuit, which are indicative of a data bit value of the 4-level input data signal representing one of the clock signal, the one-bit data signal, and static values of the 4-level input data signal. In dependence upon the signals the decode logic circuit generates then a 2-bit output data signal. The 4-level logic decoder is easily implemented using simple circuit of logic components, which allow modeling using an HDL.

Abstract: The present invention relates to a 4-level logic decoder for decoding n 4-level input data signals into n 2-bit signals. The 4-level logic decoder comprises n decoding circuits with each decoding circuit comprising comparison circuitries for comparing the 4-level input data signal with a clock signal and a one-bit data signal. In dependence upon the comparison results signals are provided to a decode logic circuit, which are indicative of a data bit value of the 4-level input data signal representing one of the clock signal, the one-bit data signal, and static values of the 4-level input data signal. In dependence upon the signals the decode logic circuit generates then a 2-bit output data signal. The 4-level logic decoder is easily implemented using simple circuit of logic components, which allow modeling using an HDL.

Abstract: The present invention relates to an asynchronous data buffer for transferring m data elements of a burst-transfer between two asynchronous systems. The asynchronous data buffer comprises a data memory for storing m data elements of a data burst and a valid bit memory for storing m input valid bits corresponding to the m data elements. Input control logic circuitry generates the m input valid bits and controls storage of the same and the m data elements. After storage of the m input valid bits an input control signal is provided for inverting the input valid bits of a following data burst. Therefore, after each burst-transfer of m data elements the input valid bit is inverted, automatically rendering all data elements of a previous burst-transfer invalid.