The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2004
Filed:
Apr. 30, 2003
Applicant:
Inventors:
Jesse H. Jenkins, IV, Danville, CA (US);
Shankar Lakkapragada, San Jose, CA (US);
Assignee:
Xilinx, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 1/900 ;
U.S. Cl.
CPC ...
H03K 1/900 ;
Abstract
A programmable logic device includes a function block to generate a power control signal that is distributed on a rail to selectively power down various components on the device. The rail is coupled to an observation pin to allow for external observation of the power control signal. The power control signal is also provided as a feed forward signal to an input signal blocking circuit, which selectively enables or disables the device input pins in response to the feed forward signal. The feed forward signal is not accessible from the observation pin, and therefore cannot be externally altered from the observation pin.