Kabushiki Kaisha Toshiba

Kabushiki Kaisha Tokyo Kikai Seisakusho

Takeshi Mitsuhashi

Noriyuki Shiba

Ikuo Kotani

Hirofumi Katami

Keiichi Fukushima

According to one embodiment, semiconductor memory device is capable of operating at a first mode and a second mode which is higher in speed than the first mode. The semiconductor memory device comprising: a semiconductor memory; a controller which controls the semiconductor memory; a connector which is provided with terminals for sending and receiving data to and from an external device; and a substrate on which the semiconductor memory, the controller, and the connector are mounted, the substrate comprising a plurality of wiring layers. The controller and the connector are mounted on an identical surface of the substrate. The substrate comprises a wiring which connects a mounting pad for the terminal for data transfer at the second mode of the connector and a mounting pad for a pin for data transfer at the second mode of the controller to each other on the wiring layer on a mounting surface for the connector and the controller.

Semiconductor memory device

A synchronization control device and a synchronization control method are provided in which it includes controllers Am and Asof a master section and a slave section for accurately synchronizing rotational frequency and rotation phases of driving electric motors Mm and MsThe controller Asincludes rotational frequency detectors SsFsa master phase counter Cmand a slave phase counter Csand detects at all times both of a rotational frequency and a rotation phase of the electric motors Mm of the master based upon an output of the rotary encoder Pm, and further detects at all times both of a rotational frequency and a rotation phase of the electric motor Msof the slave. A phase deviation calculator Hs1 is provided to calculate synchronization phase deviation at all times, and when a switch RYsis actuated, it corrects an output of the rotational frequency detection means Ssbased upon the phase deviation and matches origins of the electric motors of the master section and the slave section to shift the operation to synchronization control.

Method and device for synchronization control

A synchronization control device and a synchronization control method are provided in which it includes controllers Am and As,of a master section and a slave section for accurately synchronizing rotational frequency and rotation phases of driving electric motors Mm and Ms,The controller As,includes rotational frequency detectors Ss,Fs,a master phase counter Cm,and a slave phase counter Cs,and detects at all times both of a rotational frequency and a rotation phase of the electric motors Mm of the master based upon an output of the rotary encoder Pm, and further detects at all times both of a rotational frequency and a rotation phase of the electric motor Ms,of the slave. A phase deviation calculator Hs1 is provided to calculate synchronization phase deviation at all times, and when a switch RYs,is actuated, it corrects an output of the rotational frequency detection means Ss,based upon the phase deviation and matches origins of the electric motors of the master section and the slave section to shift the operation to synchronization control.

Growing community of inventors

Kanagawa, Japan

Takeshi Mitsuhashi