专利名称：DIGITAL DATA BUFFER
发明人：Gerd Rombach,Soritios Tambouris申请号：US12028637申请日：20080208
公开号：US20080215805A1公开日：20080904
专利附图：
摘要：A data buffer with a mechanism to optimize the setup/hold timing at the secondflip-flop (or data register) so as to reduce the propagation delay time. The data bufferhas a data path with a data input for receiving a digital data input signal, a clock input forreceiving a clock input signal and a data output providing a digital data output signal for
application to a data destination device, e.g. a RAM module in a memory system. The databuffer further has a clock output for providing an output clock signal to the datadestination device and a phase locked loop (PLL) with a phase aligner and a first andsecond data register with respective clock inputs. The data input of the first data registeris selectively coupled to the data input of the buffer or to a reference data input througha multiplexer. A reference data path is provided in parallel with the data path including athird data register with a data input to which the reference data input is coupled and areference data output. A second clock output of the phase locked loop provides a clocksignal shifted in phase by the phase aligner with respect to a feedback clock signal forapplication to the clock input of the second data register and to the clock input of thethird data register. The data output of the second data register and the reference dataoutput of the third data register are applied to inputs of a logic circuit that has a controloutput. The phase aligner in the phase locked loop has associated control circuitry with acontrol input coupled to the control output of the logic circuit. A learn cycle controlsignal is applied in parallel to the multiplexer and to the control circuitry of the phasealigner causing the phase aligner in a learn cycle to adjust the phase of the clock signal atthe second clock output of the phase locked loop so as to optimise the setup/holdtiming at the data input of the second data register.
申请人：Gerd Rombach,Soritios Tambouris
地址：Freising DE,Munich DE
国籍：DE,DE
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