摘要:
A memory device and method of programming the same comprising partitioning memory into two or more chunks of information. At least a first portion of a first of the information chunks can be programmed while concurrently determining whether a first portion of a second of the information chunks should be set or reset. Further, the first portion of the second information chunk can be sequential programmed following the programming of the first portion of the first information chunk. The memory device can include different types of memory, such as PCM memory.
摘要:
A non-volatile memory may have memory portions, such as blocks or other granularities of units of memory, which may fail in actual use. These defective portions can be replaced with other portions which may, in some cases, be of corresponding size. In some embodiments, defects may be detected using a current sensor which detects the current drawn in actual operation. If an excessive current is drawn, this may be detected, the defective unit deactivated, and a replacement provided in its stead. This may result in the repair of a defect with little inconvenience to the user in some embodiments.
摘要:
A voltage reference generator includes multiple closed loop voltage references. Each of the closed loop voltage references uses a flash cell with a variable threshold voltage and a feedback loop to trim a reference voltage. The voltage reference generator includes sample and hold capacitors in output stages to allow reference voltages to be refreshed during a standby mode of operation.
摘要:
Disclosed is a method for refreshing voltages in a non volatile memory during a standby mode. The method comprises generating a first node voltage and a second node voltage through a resistance ladder, storing the voltages in a pair of capacitors, comparing the voltages by a comparator, generating an output electrical signal by the comparator upon comparing the voltages, latching the output electrical signal by a flip flop, generating an electrical refresh pulse by a refresh pulse generator upon receiving the output electrical signal from the flip flop, the electrical refresh pulse being supplied to a refresh node of a plurality of refresh nodes in the non volatile memory and generating an electrical sample pulse by a sample pulse generator, the electrical sample pulse along with the electrical refresh pulse setting the flip flop, thereby causing the flip flop to latch a new output electrical signal.
摘要:
Erase cycle counting may be used for a non-volatile memory to balance the cycles on memory blocks or partitions. In some embodiments, the non-volatile memory may include two memory locations such as wordlines associated with each block of memory. The wordlines may be alternately erased so that an updated cycle count is transferred from the wordlines to the other. In the case of a power loss in the course of the updating of the cycle count, a method may detect that the data is in improper states and require that the erase be restarted after the power loss in order to recover the correct erase cycle count.
摘要:
The delay arising from wordline capacitance in multi-level memories may be reduced by adding switched transistors along the wordline path. Also, the wordline may be pre-charged to a high level and then the first wordline voltage level for reading may be a center level. The switched transistors may be p-devices whose n-wells are biased by a stable DC voltage. Nodes along the wordline may float when not accessed. Finally, a distributed voltage generator may be used.
摘要:
A memory device includes wordline decoder circuits that share components between adjacent memory blocks. The wordline decoder circuits include multiple levels, where at least one level is split, driving half of the wordlines in one adjacent memory block and driving half of the wordlines in another adjacent memory block. Memory blocks have every other wordline coupled to one adjacent decoder circuit, and the remaining wordlines coupled to another adjacent decoder circuit.
摘要:
A Phase Change Memory device with reduced programming disturbance and its operation are described. The Phase Change Memory includes an array with word lines and bit lines and voltage controlling elements coupled to bit lines adjacent to an addressed bit line to maintain the voltage of the adjacent bit lines within an allowed range.
摘要:
Erase cycle counting may be used for a non-volatile memory to balance the cycles on memory blocks or partitions. In some embodiments, the non-volatile memory may include two memory locations such as wordlines associated with each block of memory. The wordlines may be alternately erased so that an updated cycle count is transferred from the wordlines to the other. In the case of a power loss in the course of the updating of the cycle count, a method may detect that the data is in improper states and require that the erase be restarted after the power loss in order to recover the correct erase cycle count.