Title: Apparatus and method for using fuse to store PLL configuration data
Application Number: 200610141523 Application Date: 2006.09.29
Publication Number: 1945744 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G11C17/18;G11C29/00;H03L7/08
Applicant(s) Name: IBM Address:
Inventor(s) Name: Beattie Irene;Chelstrom Nathan P.;Fernsler Matthew
Attorney & Agent: wuli li
Abstract:
    An apparatus and method for using electrical fuses (eFuses) to store phase-locked loop (PLL) configuration data are provided. With the apparatus and method, a portion of the eFuses present in the integrated circuit are reserved for the PLL configuration data. Upon power up, a power up controller and eFuse controller direct the sensing and serial transfer of the data in the portion of eFuses to the PLL under the reference clock. When the transfer is complete, the power up controller directs the PLL logic to load the configuration data and start. The mechanism of the present invention allows manufacturing to tailor the PLL configuration on a given device based on the characteristics of that device and its intended usage. Thus, the same PLL may be used in the same or different architectures to perform different operations based on the configuration data passed into the PLL from the eFuses.
Time: 10
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