摘要:
A end report of the unloading operation is issue to a host computer for a period of time after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an unloading command until before the end of the unloading operation, thereby allowing the next moving command to be issued precedently to the end of the actual unloading operation. Simultaneously there for with that the unloading operation is instructed to the recording/reproducing unit on the basis of the unloading command, the end report of the unloading operation is executed to the host computer, thereby allowing the host computer to issue the next moving command. In a data transfer control between the host computer and a control unit of a library apparatus, when the number of error times of the data transfer errors exceeds a threshold value, the subsequent data transfer speed is switched to the executable data transfer speed at which the data transfer can be retried, and the data transfer is executed.
摘要:
A non-volatile semiconductor memory device includes a plurality of memory cells each including a capacitor as a memory element, the capacitor sandwiching a ferroelectric member. The non-volatile semiconductor memory device further includes: a first counter for counting the number of write accesses and read accesses for writing or reading first logic data to each one of the plurality of memory cells; a second counter for counting the number of write accesses and read accesses for writing or reading second logic data to the memory cell; and a refresh control circuit for performing, when either a first value counted by the first counter or a second value counted by the second counter exceeds a predetermined value, a refresh operation by applying electric fields for causing a polarization state of the ferroelectric member of the capacitor to make a complete round on a hysteresis curve of the ferroelectric member in a corresponding one of the plurality of memory cells for which the first or second value counted by the first counter or the second counter has exceeded the predetermined value.
摘要:
An electrical discharge machine having an electrode and workpiece contained within a dielectric-filled machining tank for machining in response to the application of discharge current. One or more auxiliary tanks that contain additional dielectric fluid are connected to the machining tank by a plurality of fluid flow paths that contain various combinations of filters, valves and pumps. The filters may be of different filtering capacity for serving different machining operations, e.g., roughing and finishing. The operation of the valves to provide filtering appropriate to the current machining conditions is based on detected or predetermined machining conditions such as sludge grain diameter, fluid pressure, sludge quantity, electrode and workpiece material composition and discharge current levels.