Stmicroelectronics Gmbh

Avago Technologies General IP (singapore) Pte. Ltd.

Whitney Li

Paolo Menegoli

Ender Tunc Eroglu

Norman C Chou

A slave device adapted to couple to a master processor and including an error handler and a communication controller. The error handler is configured to detect errors internal to the slave device and, in response to detecting at least one error and independent of the master processor, configured to select an error recovery operation based on the at least one detected error and to initiate and perform the selected error recovery operation. The communication controller is configured to communicate with the master processor according to a master/slave protocol, and configured to maintain the master/slave protocol during performance of the selected error recovery operation by the error handler.

Slave device having independent error recovery

A disk drive having a motor and a velocity control loop, which includes a frequency detector and a filter. The filter includes a filter section and an accumulator. The filter is programmable in that filter coefficient(s) are dynamically received by the filter section. One embodiment of the filter section is an infinite impulse response filter. One embodiment of the filter is a digital integrated circuit. A method for compensating a control loop by infinite impulse response filtering and accumulating. The control loop may be a position, velocity, acceleration or force control loop. A programmable digital integrated circuit for compensating a velocity control loop having a filter section cascaded with an accumulator. The integrated circuit may include memory for storing filter coefficient(s) for the filter section, thereby not requiring external components.

Embedded programmable filter for disk drive velocity control

A method and apparatus are disclosed for controlling the operation of a polyphase motor, and particularly to determining whether the motor is spinning. The method and apparatus include initially sensing an electrical characteristic of a single phase winding of the motor. Having sensed values of the electrical characteristic, a determination is made as to whether or not the motor's rotor is spinning. Upon a determination that the rotor is not spinning, a spin-up operation is performed to bring the spin of the rotor to operable spin speeds. Otherwise, a resynchronization operation is performed.

Method and apparatus for detecting motion of a motor for a disk drive system

A method and system are disclosed for spinning the spindle motor of a disk drive from a stationary state to an operable state that is suitable for performing a memory access operation. The method and system include energizing the polyphase motor in a first predetermined commutation phase; detecting whether a zero crossing of a back electromotive force (bemf) signal corresponding to the first predetermined commutation phase occurs; sensing whether the polyphase motor advanced to a next successive commutation phase relative to the first predetermined commutation phase; and performing an acceleration procedure to accelerate the speed of the polyphase motor towards a desired speed based upon a detected zero crossing of the bemf signal and an affirmative determination that the polyphase motor advanced to a next successive commutation phase relative to the first predetermined commutation phase.

Adaptive system and method for spinning a polyphase disk drive motor from a stationary position

A method and device are disclosed for controlling a polyphase motor having a plurality of windings. The device includes a memory device having stored therein data representing a predetermined driving profile, and driver circuit for driving the windings of the polyphase motor based upon the data provided by the memory unit. A feedback control loop is included having an input connected to a selected winding of the polyphase motor and providing an address signal to the memory device that is based upon a current level of the selected winding at around the time the back electromotive force (bemf) signal corresponding thereto crosses a zero reference, for controlling current provided to the windings by the driver circuit so that, for each winding, the current provided thereto is substantially in phase with a back electromotive force (emf) signal corresponding to the winding.

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San Jose, CA, United States of America

Whitney Li