IS25F011A 데이터 시트보기 (PDF) - Integrated Silicon Solution

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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 ®

Transfer SRAM to Program Buffer

The Transfer SRAM to Program Buffer command trans-

fers all 264 bytes from the SRAM to the Program Buffer at

one time without the clock sequencing required in the

Transfer Sector to SRAM command. This command can

be useful in applications where the SRAM and Program

Buffer are to be used independently of the Flash memory.

Effective use of the Transfer to SRAM or Program Buffer

commands allow the two 264-byte buffers to act as 528-

bytes of user SRAM. The command sequence is similar

to the Write or Read SRAM commands except that the

Transfer SRAM to

Program Buffer

Command 16 Clocks

16 Clocks

16 Clocks

SI

92H

0000H

0000H

0000H

sector address field S[15:0] and byte address B[15:0]

field are replaced with all 0 bits. After the last byte

address is transferred, the command is completed by

issuing 16 control clocks and then asserting CS high.

There is a required delay time after CS is asserted high

(see tXP timing specification). During this time the data

from the SRAM is being transferred to the Program

Buffer and neither are available for use. Status of this

operation can be checked by testing the Transfer in

Process bit (TR) in the status register.

Transfer Time

(tXP)

SO

Read from Program Buffer Command

The Read from Program Buffer command (91H) provides

access to the 264-Byte Program Buffer. The command is

similar to the Read from Sector command except that the

sector address field S[15:0] is replaced with all 0 bits. This

command can be useful in applications where the SRAM

and Program Buffer are used independently of the Flash

memory. This command cannot be used while the device

is busy.

Read from

Program Buffer

Command 16 Clocks

Byte

Address*

16 Clocks

SI

91H

0000H

B[15:0]

0000H

SO

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

RB[15:0]

Read/Busy

Status

First Byte - Last Byte

Read Program Buffer Data

16

Integrated Silicon Solution, Inc.

PRELIMINARY SF001-1A

06/24/98

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