Abstract: A memory controller component of a memory system stores memory access requests within a transaction queue until serviced so that, over time, the transaction queue alternates between occupied and empty states. The memory controller transitions the memory system to a low power mode in response to detecting the transaction queue is has remained in the empty state for a predetermined time. In the transition to the low power mode, the memory controller disables oscillation of one or more timing signals required to time data signaling operations within synchronous communication circuits of one or more attached memory devices and also disables one or more power consuming circuits within the synchronous communication circuits of the one or more memory devices.

Abstract: A system includes a memory controller and a memory device having a command interface, refresh circuitry, control logic, and a plurality of memory banks, each with a plurality of rows of memory cells. The command interface is operable to receive a refresh command from a memory controller and the refresh circuitry is configured to perform one or more refresh operations to refresh data stored in at least one bank of the plurality of memory banks during a refresh time interval in response to the refresh command from the memory controller. The control logic is to configure the command interface to enter a calibration mode during the refresh time interval, and the command interface is configured to perform a calibration operation in the calibration mode during the refresh time interval.

Abstract: This invention relates to arrangements for providing pre-authenticated access from a caller to a service provider. The caller dials the number of the service provider and subsequently enters a personal identification number (PIN) or other suitable authentication data, and, if necessary, an account number. A data base in the communications carrier verifies that the caller has been authorized to access the service provider and that the PIN is correct for that caller and forwards the call to the service provider only if both checks are satisfied. Only preauthenticated calls are delivered to the service provider, and the caller need only remember one PIN for all the service providers accessed by this arrangement.