Method and apparatus for timing domain crossing

Details Method and apparatus for timing domain crossing Method and apparatus for timing domain crossing

2008-05-20

2008-05-20

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C713S600000

Reexamination Certificate

active

07375560

ABSTRACT:
A timing domain crossing apparatus and method of transferring signals between timing domains are disclosed. A receiver samples a data signal with a sample clock in a first timing domain. The sampled data signal is expanded to a plurality of expansion signals, which are held valid for a plurality of consecutive active clock cycles. A data order adjuster may re-order the plurality of expansion signals to a predetermined order. A timing generator samples a command signal with an internal clock in a second timing domain to generate a re-timing strobe. The re-timing strobe may be temporally positioned to be within the expansion data window and used to sample the plurality of expansion signals in the second timing domain. The timing domain crossing apparatus and method of signal sampling may be incorporated in a semiconductor device, which may be fabricated on a semiconductor wafer and included in an electronic system.

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