International Business Machines Corporation

Irene Beattie

Mack Wayne Riley

Nathan Paul Chelstrom

Matthew E Fernsler

Michael Terrell Vanover

Ingemar Holm

John A Voltin

Narendra Maganlal Desai

A mechanism for using electrical fuses (eFuses) to store phase-locked loop (PLL) configuration data are provided. With the mechanism, 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.

Using eFuses to store PLL configuration data

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.

Apparatus and method for using eFuses to store PLL configuration data

A method, an apparatus and a computer program product are provided for the compression of array redundancy data. Array redundancy data can be lengthy and take up a lot of space on a processor. This invention provides an algorithm that can compress array redundancy data for storage, and decompress and reload the array redundancy data at power-on of the processor. This compression algorithm saves a lot of space on the processor, which enables the processor to save power during operation, and function more efficiently. This algorithm also skips defective array redundancy data, which can be detrimental to the processor.

Algorithm to encode and compress array redundancy data

Apparatus and methods for selectively controlling by window the number of overlay planes, the number of overlay palettes, and the overlay/underlay plane masks in a graphics video display system. A logic/multiplex control translates overlay and underlay data patterns from a multiple plane VRAM (Video Random Access Memory), referenced to the graphics system frame buffer, into window specific patterns. The window related translation is conveyed to conventional RAMDACs (Random Access Memory Digital-to-Analog Converters) for raster scan synchronized digital-to-analog conversion. The translation as provided by the controller is responsive to data selectively and dynamically written into a random access memory, thus providing translation of overlay/underlay data into window distinct and selective overlay/underlay palette functions.

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Leander, TX, United States of America

Irene Beattie