Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating
Reexamination Certificate
2005-04-12
2005-04-12
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Clock or pulse waveform generating
C327S298000, C327S175000, C327S176000, C377S124000
Reexamination Certificate
active
06879201
ABSTRACT:
A glitchless T length pulse is generated by coupling a trigger signal and the latched output of a counter. The trigger signal initiates the start of the T length pulse, and the latched output of the counter initiates the end of the T length pulse after counting up a duration of T from a number of clock cycles of a clock signal. Latching the output of the counter prior to terminating the T length pulse eliminates glitches. Accuracy of the count determining the length of the T length pulse may be increased by latching the trigger signal with the clock signal to generated a synchronized trigger signal, and using the synchronized trigger signal to initiate the T length pulse.
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Peter H. Alfke, “Trouble-Free Switching Between Clocks”, published First Quarter 1997 in Xilinx Publication XCell, available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124.
Liu Justin
Stephenson Julie A.
Xilinx , Inc.
Young Edel M.
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