Broadcom Corporation

Other

Thomas A Hughes

Sathish Kumar Radhakrishnan

Lionel D'Luna

Kwang Young Kim

Mark Chambers

Kelly Brian Cameron

Hau Thien Tran

Matthew E Anderson

Matthew Anderson

A system and method are used to allow high speed communication between a circuit and an external device. The system and method include a PLL with multiple phased outputs configured to be controlled digitally, a deskew PLL configured to align a clock of controller circuitry to interface circuitry, and a phase interpolated voltage controlled delay line configured to phase shift incoming signals. Analog design techniques of phase interpolation accurately position clocks and strobe signals that are required for high speed interfaces. The high speed interface is for transmitting and receiving signals from the external device, for example, a DDR DRAM.

Phase controlled high speed interfaces

A system and method use an aligning device to align clock signals of two logic devices before data transfer between them. In this example, the aligning device aligns a clock signal of a sequencer with a clock signal of a storage device before the sequencer transfers data to the storage device. The aligning device includes a phase detector that receives a first reference clock signal, which is used to control the storage device, and a delayed signal, which is used to control the sequencer, and generates a comparison clock signal. The comparison clock signal is filtered before being used to control a phase of a second reference clock signal, which is related to the first reference clock signal. The phase controlled second clock signal is an aligning clock signal that is feed back to a delay device to produce one or more subsequent delay device clock signals that are aligned to the storage device clock or first reference clock signal. These subsequent delay device clock signals are transmitted to the aligning device and to the sequencer before each transfer occurs.

System and method to align clock signals

A system and method are used to allow high speed communication between a chip and an external device. The system and method include a PLL with multiple phased outputs configured to be controlled digitally, a deskew PLL configured to align a clock of controller circuitry to interface circuitry, and a phase interpolated voltage controlled delay line configured to phase shift incoming signals. Analog design techniques of phase interpolation accurately position clocks and strobe signals that are required for high speed interfaces. The high speed interface is for transmitting and receiving signals from the external device, for example, a DDR DRAM.

Method and apparatus for Min star calculations in a Map decoder. Min star calculations are performed by a circuit that includes a first circuit that performs an Min(A,B) operation simultaneously with a circuit that calculates a &#x2212;log(1+e) value. The sign bit of the A&#x2212;B calculation is used to select whether A or B is a minimum. The A&#x2212;B calculation is also used to select either &#x2212;log(1+e) or &#x2212;log(1+e) as the correct calculation. In order to hasten the selection of either &#x2212;log(1+e) or &#x2212;log(1+e) as the correct calculation the apparatus does not wait for the A&#x2212;B calculation to complete. Any bit of the A&#x2212;B calculation between the third bit and final (sign bit) can be used for the selection. If an incorrect value is selected a log saturation circuit may correct the value. In addition an offset may be added &#x2212;log(1+e) or &#x2212;log(1+e) to assure that the calculation does not become negative, necessitating the use of an additional sign bit thereby increasing circuit complexity and slowing down the calculation. Additionally the log terms are computed based on a partial result of the A&#x2212;B calculation.

Method and apparatus for min star calculations in a map decoder

An apparatus for producing multiple light displays comprises: a discrete light source emitting at least one primary color; a circuit for driving the light source; a flexible tether secured to the light source; a handle secured to the flexible tether; and a control actuator. The drive circuit produces each of multiple time-dependent drive signals. The handle enables a user to move the light source along a curvilinear path at the end of the tether, the time-dependent drive signal and movement of the light source together producing the light display. The control actuator enables the user, while moving the light source along the curvilinear path and without substantially interrupting movement of the light source, to (i) alter the time-dependence of the drive signal and/or (ii) select another of the time-dependent drive signals for driving the light source, thereby altering the light display.

Apparatus and methods for continuous and/or selective production of multiple light displays

A kinetically multicolored light source is described, comprising: a light source capable of producing a plurality of primary colors; oscillatory means for driving said light source; and means for moving said light source. The oscillatory driving means may drive the light source so that one or more of the primary colors is alternately turned on and off at a frequency above the critical fusion frequency of an observer, whereby each of the colors appears to emanate simultaneously and continuously thereby appearing to the observer as a single secondary color when the light source moves slowly with respect to the observer. The light source may move relative to the observer sufficiently rapidly that each of the oscillating primary colors if viewed alone would appear to the observer to emanate from bright segments of a curvilinear path with intervening dark segments. When viewed together the path segments for each of the primary colors may spatially overlap to varying degrees depending on the relative frequency, amplitude, phase, and duty cycle at which each of the primary colors is produced. The observer may therefore observe a myriad of color alternation pattern along the curvilinear path, which may comprise one or more of: dark segments, bright primary color segments, and bright secondary color segments. Thus, by moving the light source sufficiently rapidly relative to the observer, visually striking, intriguing, and/or pleasing multicolored illuminated displays may be produced by a light source which appears monocolored when moving relatively slowly relative to the observer.

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Irvine, CA, United States of America

Thomas A Hughes