APPARATUS AND METHOD FOR USING ELECTRICAL FUSES TO STORE PLL CONFIGURATION DATA

摘要

PROBLEM TO BE SOLVED: To provide an apparatus and a method for using electrical fuses to store PLL configuration data.

SOLUTION: A portion of the electrical fuses 150 present in an integrated circuit are reserved for the PLL configuration data. Upon power up, a power up controller and an electrical fuse controller 120 sense data at the portion of the electrical fuses 150 and direct serial transfer of the data to a PLL circuit 195 under the reference clock. When the transfer is complete, the power up controller directs a PLL logic to load the configuration data and start. Upon manufacturing, it is made possible to tailor a PLL default value on a given device based on the characteristics of that device and its intended usage. Thus, the same PLL 195 may be used in the same or different architectures to perform different operations based on the configuration data passed into the PLL circuit 195 from the electrical fuses 150.

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