NX25F080A 데이터 시트보기 (PDF) - NexFlash -> Winbond Electronics

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NX25F080A

8M-BIT SERIAL FLASH MEMORY WITH 4-PIN SPI INTERFACE

NexFlash -> Winbond Electronics 

NX25F080A

Transfer SRAM to Program Buffer

The Transfer SRAM to Program Buffer command trans-

fers all 536 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 536-byte buffers to act as

1072-bytes of user SRAM. The command sequence is

similar to the Write or Read SRAM commands except that

Transfer SRAM to

Program Buffer

Command 16 Clocks

16 Clocks

16 Clocks

SI

92H

0000H

0000H

0000H

the 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 536-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

SI

91H

0000H

Byte

Address*

B[15:0]

16 Clocks

0000H

SO

*The byte address only uses bits [9:0]

RB[15:0]

Read/Busy

Status

First Byte - Last Byte

Read Program Buffer Data

16

NexFlash Technologies, Inc.

PRELIMINARY NXSF005C-0699

06/11/99 ©

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