Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Reexamination Certificate
2005-01-11
2005-01-11
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
C327S200000, C327S201000
Reexamination Certificate
active
06842059
ABSTRACT:
A register chip for double-data-rate (DDR) memory modules operates in 1:1 mode or 1:2 mode. A differential input clock is buffered to generate a slave clock that continuously clocks slave stages of flip-flops, and gated to generate a first clock pulsing only in 1:1 mode and a second clock pulsing only in 1:2 mode. The master stage has two input transmission gates, one activated by the first clock and another activated by the second clock. In 1:1 mode a first data bit is sampled by the first clock, but in 1:2 mode a second data bit is sampled by the second clock. The sampled bit is inverted and applied to the slave stage and to a feedback gate that has transistors gated by the first and second clocks. The clock-to-output delay is improved since an output mux is replaced by the muxing function built into the master stage.
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Auvinen Stuart T.
Callahan Timothy P.
Luu An T.
Pericom Semiconductor Corp.
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