Patent application number | Description | Published |
20110047408 | Handling of hard errors in a cache of a data processing apparatus - A data processing apparatus and method are provided for handling hard errors. The data processing apparatus comprises processing circuitry for performing data processing operations, and cache storage having a plurality of cache records for storing data values for access by the processing circuitry when performing the data processing operations. A cache record error storage having at least one error record, and a hard error storage having at least one hard error record, are provided for keeping track of errors detected when accessing cache records of the cache storage. In particular, when an error is first detected for a particular cache record, one of the error records in the cache record error storage is allocated to store a cache record identifier for that cache record, and an associated count value is set to a first value. Further, if an error is detected when accessing a cache record, a correction operation is performed in respect of that currently accessed cache record, and access to that currently accessed cache record is then re-performed. Each time an error is detected for subsequent accesses to that cache record, the count value is incremented, and each time an error is not detected when that cache record is accessed, the count value is decremented. If the count value reaches a predetermined threshold value, then the cache record identifier is moved from the cache record error storage to an error record of the hard error storage. Any cache record whose cache record identifier is stored in the hard error storage is logically excluded from the plurality of cache records of the cache storage for the purposes of subsequent operation of the cache storage. Such an approach provides a hardware mechanism that automatically identifies and corrects hard and soft errors, but only masks from further use those cache records affected by hard errors. | 02-24-2011 |
20110047411 | Handling of errors in a data processing apparatus having a cache storage and a replicated address storage - A data processing apparatus and method are provided for handling errors. The data processing apparatus comprises processing circuitry for performing data processing operations, a cache storage having a plurality of cache records for storing data values for access by the processing circuitry when performing the data processing operations, and a replicated address storage having a plurality of entries, each entry having a predetermined associated cache record within the cache storage and being arranged to replicate the address indication stored in the associated cache record. On detecting a cache record error when accessing a cache record of the cache storage, a record of a cache location avoid storage is allocated to store a cache record identifier for the accessed cache record. On detection of an entry error when accessing an entry of the replicated address storage, use of the address indication currently stored in that accessed entry of the replicated address storage is prevented, and a command is issued to the cache location avoid storage. In response to the command, a record of the cache location avoid storage is allocated to store the cache record identifier for the cache record of the cache storage associated with the accessed entry of the replicated address storage. Any cache record whose cache record identifier is stored in the cache location avoid storage is logically excluded from the plurality of cache records of the cache storage for the purposes of subsequent operation of the cache storage. Such an approach enables errors to be correctly handled, prevents errors from spreading in a system, and minimises communication necessary on detection of an error in a data processing apparatus having both a cache storage and a replicated address storage. | 02-24-2011 |
Patent application number | Description | Published |
20100119356 | DEVICE FOR REGULATING THE FLOW RATE OF AIR FEEDING A TURBINE VENTILATION CAVITY OF A TURBOMACHINE TURBINE SECTION - The invention relates to a device for regulating the flow rate of air feeding a turbine ventilation cavity of a turbomachine turbine section, the device comprising at least one tubular duct opening into a take-off cavity and leading into a turbine ventilation cavity, the pressure inside the take-off cavity being higher than the pressure inside the turbine ventilation cavity, an air flow rate regulation valve disposed in the tubular duct, the valve being suitable for moving under the effect of the pressure difference between the take-off cavity and the turbine ventilation cavity, and mechanical return means for holding the valve in a maximum closure position for the duct so long as the pressure difference between the take-off cavity and the turbine ventilation cavity remains below a predetermined threshold pressure. | 05-13-2010 |
20110058941 | CENTRIPETAL AIR BLEED FROM A TURBOMACHINE COMPRESSOR ROTOR - A compressor rotor for a turbomachine including at least two disks on a common axis carrying blades and connected together by a tubular wall, forming a surface of revolution, and a centripetal air bleed mechanism including air passages passing through the tubular wall, together with a wall extending along the tubular wall from the through passages up to one of the disks to channel the air stream inside the tubular wall. | 03-10-2011 |
20110188992 | METHOD AND A DEVICE FOR BALANCING PRESSURE IN A TURBOJET BEARING ENCLOSURE - A pressure-balancing device for balancing pressure in at least one bearing enclosure of a turbojet, the enclosure including a mechanism feeding the bearing with lubricating liquid, an air intake, at least one sealing system placed between the stator and the rotor in front of and/or behind the bearing, a recovery mechanism recovering the lubricating liquid, and a removal mechanism removing the mixture of air and of traces of lubricating liquid towards a venting circuit. Downstream from the bearing enclosure and in the venting circuit, the balancing device includes a regulator system regulating the air removal flow rate, thereby enabling the flow rate to be variable as a function of the speed of the engine, to remain non-zero, and, at high speeds, to be lower than when the regulator system is not included. | 08-04-2011 |
20110198155 | METHOD AND SYSTEM FOR LUBRICATING A TURBINE ENGINE - A method and a system for lubricating a turbine engine including at least three separate housings each including at least one roller bearing. The method pressurizes the housings through seals, of which two main housings are pressurized at a pressure higher than that of a remaining secondary housing, lubricates a secondary roller bearing only by injecting an oil mist from at least one of the main housings, the oil mist being supplied by a pressure difference between the main housings and the secondary housing, recovers a remainder of the lubrication oil injected into the main housings to supply the same to an oil tank, and supplies the air/oil mixture from the secondary housing to an oil separator. | 08-18-2011 |
20140126992 | TURBINE ENGINE COMPRISING A FLOATING BEARING FOR GUIDING A SHAFT OF THE TURBINE ENGINE - A turbine engine including at least one shaft and at least one bearing for rotatably guiding the shaft about an axis of the turbine engine, the bearing including a first radially inner ring and a second radially outer ring enclosing rolling members, wherein the first ring is floatingly mounted on the shaft via a fluid damping film. | 05-08-2014 |