NX25F011B 查看數據表（PDF） - Unspecified

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NX25F011B

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

Unspecified 

NX25F011B

NX25F021B

NX25F041B

SERIAL SRAM COMMANDS

Write to SRAM Command (72H)

The Write to SRAM command (72H) provides access to

the 264-Byte SRAM independently of any Flash memory

array operation. When CS is asserted high to complete

the command, the contents of the SRAM will be main-

tained until overwritten through another command or the

power is removed. Using the Write to SRAM command,

1

data can be loaded in preparation of writing to a sector in

memory and then transferred to a selected sector using

the Transfer SRAM to Sector command. The TR bit in the

2 status register should be checked first if Transfer Sector to

SRAM or Compare Sector to SRAM commands are used.

3

Write to

SRAM

Byte

Command Address*

Write Sector Data

8 Clocks

SI

72H

B[15:0]

First Byte - Last Byte

00H

4

SO

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

5

6

Read from SRAM (71H)

The Read from SRAM command (71H) provides access to

the 264-Byte SRAM independent of any Flash memory

array operations. The TR bit in the status register should be

checked first if Transfer Sector to SRAM or Compare Sector

to SRAM commands are used.

Read from

SRAM

Command

SI

71H

Byte

Address*

B[15:0]

8 Clocks

00H

SO

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

First Byte-Last Byte

Read SRAM Data

7

8

9

10

11

12

NexFlash Technologies, Inc.

19

PRELIMINARY NXSF016F-1201

12/12/01 ©

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