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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 Sector to SRAM Clocked (54H)

The Transfer Sector to SRAM Clocked command (54H)

allows the contents of a sector to be transferred directly to

the SRAM without having to read the sector out of the device

and rewrite it into the SRAM. The command is similar to the

Write to Sector command except that instead of inputting

data from the SI pin, the data is taken from the specified

sector and is transferred to the SRAM. Every eight clocks

on SCK, a byte from the specified sector to the SRAM will

be transferred. Although data on SI is ignored, it is recom-

mended to write data bytes of 00H in order to support the

clocking requirements. During the transfer, the SO output is

in a high-impedance state. When the last byte address is

transferred, the command can be completed by issuing

eight more control clocks and asserting CS high. If the clock

continues to increment past the highest byte-address

(107H), the address counter will roll over to byte-0H. This

command can also be used to load partial sectors into

SRAM

Transfer Sector

to SRAM

Sector

Command Address*

SI

54H

S[15:0]

Byte

Address**

B[15:0]

8 Clocks per Byte Trasnfered

from First Byte to Last Byte

SI=00H During Byte Ttansfers

SO

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

**The byte address only uses bits [8:0]

8 Clocks

00H

Compare Sector to SRAM Clocked (86H)

The Compare Sector to SRAM command does a bit-by-bit

comparison of the data stored in the addressed sector

against data in the SRAM. The command is similar to the

Read from Sector command except that data is not read out

of the Serial Output pin (SO). Instead, the SO pin provides

a bit-by-bit compare of each sector and SRAM bit. A high (1)

per bit will be output if the bit compare is equal. A low (0) per

bit will be output if the bit compare is not equal. The compare

can start from any location in the 264-byte range as

specified by the byte-address field B[15:0]. The

byte-address counter is automatically incremented and will

wrap around to the first address (0H) if it passes the last

address (107H). If any of the compared bits are not equal,

then the Compare Not Equal (CNE) bit in the Status Register

is set to a 1. This bit will stay set until a Clear Compare

Status command has been issued. This command can also

be used to load partial sectors into SRAM

Compare Sector

with SRAM Sector

Command Address*

SI

86H

S[15:0]

Byte

Address**

B[15:0]

16 Clocks

0000H

SO

RB[15:0]

First Byte - Last Byte

Read/Busy

Status

Bit Compare of Sector

and SRAM

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

**The byte address only uses bits [8:0]

28

NexFlash Technologies, Inc.

PRELIMINARY NXSF016F-1201

12/12/01 ©

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