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IS25F011A

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

Integrated Silicon Solution 

IS25F011A

IS25F021A

IS25F041A

ISSI ®

SRAM AND PROGRAM BUFFER COMMANDS

Write to SRAM Command

The Write to SRAM command (82H) provides access to

the 264-Byte SRAM independently of any Flash memory

array operation. The command is similar to the Write to

Sector command sequence except that the sector ad-

dress field S[15:0] is replaced by all 0 bits. When CS is

asserted high to complete the command, the contents of

the SRAM will be maintained until overwritten via another

Write to

SRAM

Command

16 Clocks

SI

82H

0000H

Byte

Address*

B[15:0]

SO

1

command or the power is removed. Using the Write to

SRAM command, data can be loaded in preparation of

writing to a sector in memory and then transferred to a

2 selected sector using the Transfer SRAM to Sector

command.

3

Write Sector Data

8 Clocks

First Byte - Last Byte

00H

4

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

5

Read from SRAM

The Read from SRAM command (81H) provides access

to the 264-Byte SRAM independent of any Flash memory

array operations. The command is similar to the Read

Read from

SRAM

Command

16 Clocks

Byte

Address*

16 Clocks

SI

81H

0000H

B[15:0]

0000H

SO

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

6 from Sector command except for the sector address field

S[15:0] which is replaced with all 0 bits.

7

8

RB[15:0]

First Byte - Last Byte

Read/Busy

Read SRAM Data

Status

9

10

11

12

Integrated Silicon Solution, Inc.

15

PRELIMINARY SF001-1A

06/24/98

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