NX25F011A 查看數據表（PDF） - NexFlash -> Winbond Electronics

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NX25F011A

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

NexFlash -> Winbond Electronics 

NX25F011A

NX25F041A

Transfer SRAM to Program Buffer

The Transfer SRAM to Program Buffer command transfers

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 sector address

Transfer SRAM to

Program Buffer

Command 16 Clocks

16 Clocks

16 Clocks

SI

92H

0000H

0000H

0000H

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 specifica-

tion). During this time the data from the SRAM is being

transferred to the Program Buffer and neither are avail-

able 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

NexFlash Technologies, Inc.

PRELIMINARY NXSF014B-0699

06/11/99

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