Samsung KFN4G16Q2A, KFM2G16Q2A warranty Copy-Back Program Operation, 113

MuxOneNAND2G(KFM2G16Q2A-DEBx)		FLASH MEMORY
	MuxOneNAND4G(KFN4G16Q2A-DEBx)
3.12 Copy-Back Program Operation

The Copy-Back program is configured to quickly rewrite data stored in one page without utilizing memory other than OneNAND. Since the time-consuming cycles of serial access and re-loading cycles are removed, the system performance is improved. The benefit is especially obvious when a portion of block is updated and the rest of the block also need to be copied to the newly assigned free block.

Data from the source page is saved in one of the on-chip DataRAM buffers and then programmed directly into the destination page. The Dat- aRAM is overwritten the previous data using the Buffer Sector Address (BSA) and Buffer Sector Count (BSC).

The Copy-Back Program Operation does this by performing sequential page-reads without a serial access and executing a copy-program using the address of the destination page.

Copy-Back Program Operation Flow Chart

Start

Select DataRAM for DDP

Add: F101h DQ=DBS

Write ’DFS, FBA’ of Flash

Add: F100h DQ=DFS, FBA

Write ’FPA, FSA’ of Flash

Add: F107h DQ=FPA, FSA

Write ’FCBA’ of Flash

Add: F102h DQ=FCBA

Write ’FCPA, FCSA’ of Flash

Add: F103h DQ=FCPA, FCSA

Write ’BSA, BSC’ of DataRAM

Add: F200h DQ=BSA, BSC1)

Write 0 to interrupt register

Add: F241h DQ=0000h

Write ’Copy-back Program’

command

Add: F220h DQ=001Bh

Wait for INT register low to high transition

Add: F241h DQ[15]=INT

Read Controller

Status Register

Add: F240h DQ[10]=Error

DQ[10]=0?
	YES		NO
Copy back completed		Copy back Error

*: If program operation results in an error, map out the block including the page in error and copy the target data to another block.

*DBS, DFS is for DDP

NOTE :

1)Selected DataRAM by BSA & BSC is used for Copy back operation, so previous data is overwritten.

2)FBA, FPA and FSA should be input prior to FCBA, FCPA and FCSA.

3)’Write 0 to interrupt register’ step may be ignored when using INT auto mode. Refer to chapter 2.8.18.1.

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