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NX25F011B

1M-BIT, 2M-BIT, AND 4M-BIT SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE

Unspecified 

NX25F011B

NX25F021B

NX25F041B

Transfer All of SRAM to Sector (F3H)

The Transfer SRAM to Sector command (F3H) will

write the existing contents of the SRAM to the speci-

fied sector in memory. The command sequence is

identical to that of the Write to Sector command

except that immediately after the sector address field

S[15:0] and 16 control clocks, the CS pin is asserted

high. This automatically transfers the 264-bytes of

SRAM data to the specified sector in the memory array.

During this time, the array will be busy. Since the entire

264-bytes are transferred, the byte-address field B[15:0]

is not used.

Transfer SRAM

to Sector

Sector

Command Address*

SI

F3H

S[15:0]

16 Clocks

0000H

Program Time

(tWP)

SO

*The sector address only uses bits [8:0], [9:0] or [10:0]

Depending on device density

Transfer All of Sector to SRAM (53H)

The Transfer Sector to SRAM command (53H) allows the

contents of a sector to be transferred directly to the SRAM

without having to clock or read the sector out of the device

and rewrite it into the SRAM. During the transfer, the SO

output is in a high-impedance state and the TR bit in the

status register will be set to a "1" state. When the last byte

address is transferred the TR bit in the status register will be

cleared. Note that the Transfer Sector to SRAM Clocked

command (54H) can also be used if partial transfers are

required.

Transfer Sector

to SRAM

Sector

Command Address*

SI

53H

S[15:0]

32

Clocks

0000 0000H

Transfer Time

(tXS)

SO

*The sector address only uses bits [8:0], [9:0] or [10:0]

Depending on device density

20

NexFlash Technologies, Inc.

PRELIMINARY NXSF016F-1201

12/12/01 ©

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