Asynchronous interface

Details Asynchronous interface Asynchronous interface

1997-03-28

1999-05-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327144, 375359, 371 221, 371 225, 371 2236, H03L 700

Patent

active

059007532

ABSTRACT:
An interface allowing to transfer serial test data from a Test Access Port (TAP) to controllers located in several clock domains is described. The clock frequencies can be different from each other and do not need to be related in phase to each other or with the clock of the TAP. The interface is proven to work reliably as long as the clock frequencies used for the test controllers and registers is 3 times higher than the one of the TAP used to source the serial test data.

REFERENCES:
patent: 5048021 (1991-09-01), Jarwala et al.
patent: 5396498 (1995-03-01), Lestrat et al.
patent: 5627842 (1997-05-01), Brown et al.
patent: 5673276 (1997-09-01), Jarwala et al.
patent: 5677915 (1997-10-01), Whetsel
patent: 5701308 (1997-12-01), Attaway et al.
patent: 5717702 (1998-02-01), Stokes et al.

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