Broadcom Corporation

Cirrus Logic Inc.

Atmel Corporation

Balaji Venugopal Virajpet

Kaushik L Popat

Siamack Nemazie

William R Foland, Jr

Shiang-Jyh Chang

Vineet Dujari

Roger McPherson

Maoxin Wei

Dilip Sangam

Tushar Heramb Dhayagude

Sean S Chen

Hendrik Santo

Minjong Kim

Sivaprakash Kannan

System(s) and methode s) are provided to regulate backlighting in a light emitting diode (LED)-based display through a sequence of alternate pulse-width-modulation (PWM) frame or sub-frame insertions. Alternate PWM frames or sub-frames can be black or non-black. A plurality of pixels in the display is partitioned into at least one zone including one or more rows of pixels; the at least one zone determines sub-frame period based on refresh frequency of the display. A sequence of alternate PWM sub-frames includes at least one alternate sub-frame and at least one normal sub-frame. Alternate PWM frames or alternate PWM sub-frames include a phase delay during which a backlight unit is turned off, and a PWM sequence in which the backlight unit is turned on with a finite duty cycle for the remainder of the PWM frame or sub-frame.

Control of light-emitting-diode backlight illumination through frame insertion

System(s) and method(s) are provided to regulate backlighting in a light emitting diode (LED)-based display through a sequence of alternate pulse-width-modulation (PWM) frame or sub-frame insertions. Alternate PWM frames or sub-frames can be black or non-black. A plurality of pixels in the display is partitioned into at least one zone including one or more rows of pixels; the at least one zone determines sub-frame period based on refresh frequency of the display. A sequence of alternate PWM sub-frames includes at least one alternate sub-frame and at least one normal sub-frame. Alternate PWM frames or alternate PWM sub-frames include a phase delay during which a backlight unit is turned off, and a PWM sequence in which the backlight unit is turned on with a finite duty cycle for the remainder of the PWM frame or sub-frame. A sequence of alternate PWM sub-frames can be configured internally or externally. Internal configuration can be synchronous with a reference signal whereas external configuration relies on external reference signal.

The innovation relates to systems and/or methodologies for error detection during sub-assembly in high voltage analog circuits. A signal driver communicates test signals to one or more high voltage analog circuits, and a state machine compares the electrical and/or thermal responses of the high voltage analog circuits to a set of predetermined expected results (e.g., signatures). The signal driver and state machine can be incorporated into the high voltage analog circuits. The expected results can be stored in the target circuits in the form of look-up tables, matrices, and so forth. Errors, such as, dry solders and bridge solders can be determined based on the comparison of the obtained responses to the expected signatures.

Method and apparatus for sub-assembly error detection in high voltage analog circuits and pins

An integrated data storage control system provides, in a single integrated circuit, RDC, servo logic, ATA interface, microprocessor, and other formerly discrete components in one highly integrated system design. The integrated circuit is rendered using a single integrated circuit technology type (e.g., digital CMOS) for all components. Analog and digital circuits are combined in such a way as to eliminate or reduce noise or interference in digital circuits from analog circuit components. Individual elements may have their outputs and inputs MUXed together such that individual elements can be selectively switched (during testing modes) such that the integrated circuit emulates or behaves in the same or similar manner as one of the prior art components. The present invention may be applied to magnetic hard disk drives (HDDs) or other types of storage devices such as floppy disk controllers, optical disk drives (e.g., CD-ROMs and the like), tape drives, and other data storage devices.

Systems and methods for data storage devices and controllers

Mixed-signal single-chip integrated system electronics for data storage devices

Integrated disc drive controller

A memory map for a computer system is configurable. For example a first section of the memory map (e.g., the lower address space) is configurable so that when the process accesses this section, different devices will respond depending on the memory map in effect. In one embodiment, external non-volatile memory is accessed during a first time period based on a reset memory map. After initialization, the memory may is changed to a normal one so that subsequent accesses to the same section of the memory map result in accesses to faster memory (e.g., internal SRAM). In the case where the reset vector and interrupt vectors have relatively close addresses, the configurability of the memory map allows the reset vector to be handled through accesses to non-volatile memory while interrupt vectors are handled through accesses to faster internal SRAM.

Configurable system memory map

An integrated HDD system provides, in a single integrated circuit, RDC, servo logic, ATA interface, microprocessor, and other formerly discrete components in one highly integrated system design. The integrated circuit is rendered using a single integrated circuit technology type (e.g. digital CMOS) for all components. Analog and digital circuits are combined in such a way as to eliminate or reduce noise or interference in digital circuits from analog circuit components. The invention takes advantage of existing circuit design modules provided in the integrated circuit as &ldquo;hard block&rdquo; components which are unchanged by integrated circuit design software. Changes in operability of the overall integrated circuit may be readily achieved by altering &ldquo;soft block&rdquo; components to customize or tailor the design for a particular hard drive. Individual elements may have their outputs and inputs MUXed together such that individual elements can be selectively switched (during testing modes) such that the integrated circuit emulates or behaves in the same or similar manner as one of the prior art components.

Mixed-signal single-chip integrated system electronics for magnetic hard disk drives

Growing community of inventors

San Jose, CA, United States of America

Balaji Venugopal Virajpet