Advanced memory device having improved performance, reduced power and increased reliability
An advanced memory having improved performance, reduced power and increased reliability. A memory device includes a memory array, a receiver for receiving a command and associated data, error control coding circuitry for performing error control checking on the received command, and data masking circuitry for preventing the associated data from being written to the memory array in response to the error control coding circuitry detecting an error in the received command. Another memory device includes a programmable preamble. Another memory device includes a fast exit self-refresh mode. Another memory device includes auto refresh function that is controlled by the characteristic device. Another memory device includes an auto refresh function that is controlled by a characteristic of the memory device.
1. A memory device comprising:
an internal clock for generating clock signals;
a command receiver for receiving commands;
a data strobe driver for generating a data strobe signal, the data strobe signal utilized to capture data on a data bus, the capturing upon completion of a data strobe preamble time, wherein the completion of the data strobe preamble time indicates that the data strobe signal has achieved a steady switching state and is measured from receipt of a command on the command receiver;
programmable preamble control circuitry in communication with the data strobe driver for determining when the data strobe preamble is completed, the programmable preamble control circuitry programmed during memory device initialization;
a mode register storing a bit decoding table for determining a preamble length, the preamble length utilized by the programmable preamble control circuitry for determining when the preamble is completed, wherein the preamble length is a number of one or more clock cycles selected from the bit decoding table based on a current data rate of the memory device and a bus loading condition of the memory device,
wherein the preamble length is further based on: a location of the memory device accessed by a previous command, and based on the location of the memory device accessed by the command.
2. The memory device of claim 1 , wherein the programmable preamble control circuitry is further programmed while the memory device is during memory device run-time.
3. The memory device of claim 1 , wherein the preamble includes at least one of a toggling preamble and a static preamble.
4. The memory device of claim 1 , wherein the preamble length is responsive to one or more of an expected access rate on the memory device and speed of the data bus.
5. The memory device of claim 1 , wherein the mode register includes two or more bits that are used to specify the preamble length.