Smart prologue for nonvolatile memory program operation
For a nonvolatile (NV) storage media such as NAND (not AND) media that is written by a program and program verify operation, the system can apply a smart prologue operation. A smart prologue operation can selectively apply a standard program prologue, to compute program parameters for a target subblock. The smart prologue operation can selectively apply an accelerated program prologue, applying a previously-computed program parameter for a subsequent subblock of a same block of the NV storage media. Application of a prior program parameter can reduce the need to compute program parameters for the other subblocks.
1. An apparatus comprising:
a nonvolatile (NV) storage media to be written by an operation to program a cell and then verify the cell program, the NV storage media including a block of storage with multiple subblocks, the cell being a single level cell (SLC); and
a controller to compute a program parameter to program a first subblock of the multiple subblocks for a program prologue, apply the program parameter to program the first subblock, perform a program epilogue for the first subblock, apply the program parameter to program the other subblocks of the block without re-computation of the program parameter for the other subblocks, and skip program epilogue for the other subblocks until a last of the other subblocks.
2. The apparatus of claim 1 , wherein the NV storage media comprises NAND (not AND) media.
3. The apparatus of claim 1 , wherein the NV storage media comprises a cache media to cache data for a primary storage media.
4. The apparatus of claim 1 , wherein the program parameter comprises a program start voltage.
5. The apparatus of claim 1 , wherein the program parameter comprises a program loop voltage step size.
6. The apparatus of claim 1 , wherein the program parameter comprises a maximum number of program loops.
7. The apparatus of claim 1 , wherein the controller is to apply the program parameter to program the other subblocks of the multiple subblocks only for subblocks within a same wordline.
8. The apparatus of claim 1 , further comprising:
a storage device to store the program parameter for application to the other subblocks.
9. The apparatus of claim 8 , wherein the storage device comprises a register.
10. The apparatus of claim 8 , wherein the storage device comprises a synchronous random access memory (SRAM) device.
11. A method for programming a nonvolatile storage media, comprising:
computing a program parameter for a program prologue to program a first subblock of multiple subblocks of a block of NAND (not AND) storage media, the block having single level cells (SLCs);
storing the program parameter;
applying the program parameter to program the first subblock;
performing a program epilogue for the first subblock;
applying the program parameter to program the other subblocks of the block without re-computing the program parameter for the other subblocks; and
skipping program epilogue for the other subblocks until a last of the other subblocks.
12. The method of claim 11 , wherein applying the program parameter comprises applying a program start voltage, a program loop voltage step size, or a maximum number of program loops.
13. The method of claim 11 , wherein applying the program parameter to program the other subblocks of the multiple subblocks comprises applying the program parameter only for subblocks within a same wordline.
14. The method of claim 11 , wherein storing the program parameter comprises storing the program parameter in a register or a synchronous random access memory (SRAM) device.