公开(公告)号：JP2002218788A

公开(公告)日：2002-08-02

申请号：JP2001400308

申请日：2001-12-28

Applicant: ST MICROELECTRONICS INC

Inventor： ENDER T EROGURO ,  MENEGOLI PAOLO ,  LI WHITNEY H

IPC: H02P6/18 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To provide a method and a system which start rotation of a spindle motor for a disc drive from a stationary state into an operation-enable state which is suitable for memory access operation. SOLUTION: A multiphase motor is energized with a first prescribed commutation phase. Whether zero-crossing of a counter electromotive force (bemf), corresponding to the first prescribed commutation phase, is produced. Whether the multiphase motor is advanced to a commutation phase relatively consecutive to the first prescribed commutation phase. According to the detection of the zero-cross of the bemf signal, the affirmative determination of that the multiphase motor is advanced to the commutation phase relatively consecutive to the first prescribed commutation phase, and acceleration procedure for accelerating the speed of the multiphase motor toward a required speed is executed.

公开(公告)号：JP2002162204A

公开(公告)日：2002-06-07

申请号：JP2001257940

申请日：2001-08-28

Applicant: ST MICROELECTRONICS INC

Inventor： GOZZINI GIOVANNI

IPC: G01B7/28 ,  A61B5/117 ,  G06K9/00 ,  G06T1/00

Abstract: PROBLEM TO BE SOLVED: To provide an equipment of fingerprint sensor for detecting fingerprints by counteraction of fingers capable of improving guardianship for an unauthorized use of fingerprint with an equipment for detecting fingerprints. SOLUTION: In a capacitive equipment for detecting fingerprint, fingers are detected by plural resistive grids on an electrode of the fingerprint sensor for detecting the resistance of fingers arranged on the face of sensor. Fingers arranged on the face of sensor joins up with resistive grids and make it possible to detect the resistance of skin. The resistance detected is judged whether it corresponds to predicted biological characteristic of alive skin structure or not. Therefore, the technology for detecting fingers gives guardianship of prevention against deceptions to the equipment for detecting fingerprint.

公开(公告)号：JP2002133771A

公开(公告)日：2002-05-10

申请号：JP2001252291

申请日：2001-08-23

Applicant: ST MICROELECTRONICS INC

Inventor： WILSON AARON W ,  MATTISON RODNEY A ,  JOSEPHSON RUSSELL B

IPC: G11B20/10 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To provide a technique for compensating a variation in the spin speed of a data storage medium from a nominal, i.e., designed spin speed. SOLUTION: The nominal spin speed for the data storage medium in a specific magnetic disk storage system is provided, then the actual spin speed of the data storage medium is measured. The spin speed variation is determined by comparing the measured spin speed with the nominal spin speed. A correction coefficient is calculated based on a spin speed error, and it is applied to at least one data transfer parameter such as a channel reference frequency or read/write gate activation timing before it is applied to a subsequent data transfer process. Whether the measured spin speed is in an allowable spin speed range or not can be verified at this time.

公开(公告)号：JP2002125390A

公开(公告)日：2002-04-26

申请号：JP2001243809

申请日：2001-08-10

Applicant: ST MICROELECTRONICS INC

Inventor： MENEGOLI PAOLO

IPC: G11B19/20 ,  H02P1/52 ,  H02P6/18

Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for controlling the action of a multi-phase motor, especially for rotating a motor from inactive state to operable state. SOLUTION: The electrical properties of one or more pieces of phase winding are detected initially by executing, for example, induction detecting action. It is determined whether the rotor of a motor is rotating, using the detected values of the electrical properties. When it is determined that the rotor is not rotating, spin up action is executed to put the rotation of the rotor at operable rotational speed. On the other hand, when it is determined that the rotor is rotating, resynchronizing action is executed so as to synchronize the application of a drive signal for the phase winding of a motor with the dynamic position of the rotor.

公开(公告)号：JP2002057225A

公开(公告)日：2002-02-22

申请号：JP2001198300

申请日：2001-06-29

Applicant: ST MICROELECTRONICS INC

Inventor： FERRANT RICHARD J ,  CHAN T C

IPC: H01L27/11 ,  G11C11/412 ,  H01L21/8244

Abstract: PROBLEM TO BE SOLVED: To provide an SRAM memory cell which does not require a pull-up transistor and to provide a method for manufacturing the same. SOLUTION: A first pass gate transistor is connected between a conductive terminal of a first transistor and a first bit line of paired bit lines, and a second pass gate transistor is connected between the conductive terminal of a second transistor and a second bit line of the paired bit lines. Threshold voltages of the first and second pass gate transistors are set, to supply subthreshold currents to the first and second pull-down transistors, if a memory cell is not accessed, so that the conductive terminal of the pull-down transistor to be turned off is maintained at a voltage level corresponding to the logical high voltage.

公开(公告)号：JP2002008022A

公开(公告)日：2002-01-11

申请号：JP2001105676

申请日：2001-04-04

Applicant: ST MICROELECTRONICS INC

Inventor： SABATINI MARCO ,  RAYNAL FREDERIC ,  GOZZINI GIOVANNI

IPC: A61B5/117 ,  G06K9/00 ,  G06T1/00 ,  H03K17/96

Abstract: PROBLEM TO BE SOLVED: To provide a technology capable of precisely capturing a fingerprint image. SOLUTION: This fingerprint sensor has an array consisting on a plurality of capacitive pixels. Each of the capacitive pixels has a pair of plates and a reset transistor. The reset transistor has a gate, a source connected one of the metal plates, and a drain connected to the other of the metal plates. A reset buffer generates a reset signal. A regenerator is related to each reset transistor of each capacitive pixel. The regenerator regenerates the reset signal received from the reset buffer to remove the injection gradient over the array.

公开(公告)号：JP2001359295A

公开(公告)日：2001-12-26

申请号：JP2001124211

申请日：2001-04-23

Applicant: ST MICROELECTRONICS INC

Inventor： MENEGOLI PAOLO

IPC: G11B19/28 ,  H02P6/16 ,  H02P6/18 ,  H02P6/22

Abstract: PROBLEM TO BE SOLVED: To provide a circuit and a method for determining whether a brushless multi-phase motor is rotating in the reverse direction to the rotating direction during the normal operation period. SOLUTION: This circuit receives a reverse electromotive force signal of a first phase line and determines polarity of the reverse electromotive force signal, after the detection that the reverse electromotive force signal in relation to a second phase line has crossed the zero reference level. Based on the determined polarity of the reverse electromotive force signal of the first phase line, this circuit selective activates an output signal, indicating that the motor is rotating in the reverse direction.

公开(公告)号：JP2001249843A

公开(公告)日：2001-09-14

申请号：JP2000401113

申请日：2000-12-28

Applicant: ST MICROELECTRONICS INC

Inventor： CHOWDHURI BHASKAR ,  BANGA KANWAL PREET SINGH ,  PALAZZOLO FRANK JR ,  ZAMPIERI UGO

IPC: G06F12/00 ,  G06F12/06 ,  G06F12/08 ,  G09G5/36 ,  G09G5/39 ,  G09G5/393

Abstract: PROBLEM TO BE SOLVED: To provide technology to accelerate a graphics operation. SOLUTION: This system is provided with a memory device to accelerate the graphics operation (calculation) in electronic equipment. A memory controller is used to control pixel data to be transmitted from the memory device and to it. A cache memory is electrically coupled with the memory, a shape is specified to dynamically selected usable dimension and the quantity of the pixel data having the selected usable dimension is exchanged with the memory controller. The memory device can be defined as an SDRAM. The cache memory can be provided with plural usable memory areas or tiles.

公开(公告)号：JP2001209498A

公开(公告)日：2001-08-03

申请号：JP2000367976

申请日：2000-12-04

Applicant: ST MICROELECTRONICS INC

Inventor： STENFORT ROSS JOHN

IPC: G06F12/00 ,  G06F3/06 ,  G06F13/18 ,  G06F13/24

Abstract: PROBLEM TO BE SOLVED: To provide a method and a system for dynamically changing priority of memory request for accessing a memory device in a disk drive system. SOLUTION: The disk drive system includes a processing element which executes various operations and a hard disk controller having a buffer which provides an interface for the memory device such as a random access memory or the like. The buffer has an arbitration block that assigns priorities to memory requests for accessing the memory device. A priority modification block is provided to allow modification of assigned priority so that the priority assigned to the pending memory request issued by the processing element can be increased. The priority modification block triggers modification of priority at the occurrence of events such as receiving of interrupt by the processing element, or time-put or the like of memory request issued by the processing element.

公开(公告)号：JP2001154875A

公开(公告)日：2001-06-08

申请号：JP2000301698

申请日：2000-10-02

Applicant: ST MICROELECTRONICS INC

Inventor： EDWARDS DAVID ALAN

IPC: G06F11/28 ,  G06F11/36 ,  G06F15/78

Abstract: PROBLEM TO BE SOLVED: To provide an improved device and method for executing a debugging operation on a microcomputer. SOLUTION: This computer system is provided with one set of watch points fixed in a computer. Each watch point in the set of watch points is provided with a programmable precondition register for storing a set of pre-condition codes, and the set of precondition codes are made the same to each watch point in the set of watch points. Moreover, this computer system is provided with a comparator of which input is connected with the precondition register, and the comparator compares at least one precondition code in the set of precondition codes with a data value in the computer system, and supplies a signal to the action register in response to this.