Phase change memory with mask receiver
Technology for writing data to a phase change memory array is disclosed. In an example, a method may include identifying mask logic for masking cells in the phase change memory array and routing the mask logic to the cells. The method may further include routing input data to the cells. Set and reset pulses for the cells may be selectively prevented or inhibited based on the mask logic.
1. A phase change memory, comprising:
an array of phase change memory cells; and
a mask receiver for individual cells in the array to receive a mask, identify existing data, identify input data and determine whether to inhibit a set or a reset pulse, wherein the mask is defined by a profile and the profile is one of a plurality of profiles each associated with different mask logic.
2. The memory of claim 1 , wherein the mask comprises signals defining operations to perform for the individual cells based on the existing data and the input data.
3. The memory of claim 1 , wherein the mask is a programmable mask.
4. The memory of claim 1 , wherein the mask receiver enables simultaneous set and reset operations on different cells in the array by a sequence controller.
5. The memory of claim 1 , wherein the individual cells are configured to receive the mask and the input data in parallel.
6. The memory of claim 1 , further comprising a latch for loading the existing data in parallel with receipt of the mask at the mask receiver.
7. The memory of claim 1 , wherein the profile is for an identified operation selected for bit-alterable writing to the array of phase change memory cells.
8. The memory of claim 1 , wherein at least one of the plurality of profiles is a set or reset pulse minimizing profile and another at least one of the plurality of profiles is a set or reset pulse applied to all cells profile.
9. The memory of claim 8 , wherein the profile is either a set or reset pulse minimizing profile.
10. A data storage system, comprising:
a processor;
a power source;
a phase change memory as recited in claim 1 coupled to the processor; and
a sequence controller to route a mask to an array of cells in the phase change memory.
11. The system of claim 10 , wherein the mask is a programmable mask.
12. The system of claim 10 , wherein the sequence controller further comprises a mask generator configured to route the mask to the mask receiver.
13. The system of claim 10 , further comprising a latch for loading the existing data in parallel with receipt of the mask at the mask receiver.
14. A method of writing data to a phase change memory array, comprising:
identifying mask logic for masking cells in the phase change memory array;
routing the mask logic to the cells;
routing input data to the cells;
selectively preventing either a set or a reset pulse for the cells based on the mask logic;
altering an existing mask logic to an altered mask logic; and
reverting the altered mask logic to the existing mask logic after the altered mask logic is routed to the cells.
15. The method of claim 14 , further comprising comparing a combination of existing data and the input data to the mask logic to obtain a result; and determining whether to prevent a set or reset pulse based on the result.
16. The method of claim 14 , further comprising sending a set pulse to set cells not inhibited by the mask logic; and subsequently sending a reset pulse to reset cells not inhibited by the mask logic before the set pulse is complete.
17. The method of claim 16 , further comprising delaying further operations until the set pulse is complete.