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 Program Buffer to SRAM

The Transfer Program Buffer to SRAM command (55H)

provides access to the 264-Byte Program Buffer. The

command sequence is similar to the Write or Read SRAM

commands except that 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

Transfer Program

Buffer to SRAM

Command 16 Clocks

16 Clocks

16 Clocks

SI

55H

0000H

0000H

0000H

CS high. There is a delay time after CS is asserted high

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

the Program Buffer is being transferred to the SRAM and

neither are available for use. Status of this operation can be

checked by testing the Transfer in Process bit (TR) in the

2 status register. This command cannot be used while the

device is busy.

Transfer Time

(tXP)

3

SO

4

5

CONFIGURATION AND STATUS

COMMANDS

6

Read Configuration Register

The Read Configuration Register command provides

access to the configuration register, which stores the

current configuration of the HOLD-R/B pin, read clock

edge, write protect range, and alternate oscillator

frequency (Figure 6). The command sequence is similar

to the Read from Sector command except that the sector

address field S[15:0] and the byte-address field B[15:0]

are replaced with all 0 bits. After 16 control clocks and

7 after the Ready/Busy status field has been clocked

through, a 16-bit Configuration Data field CF[15:0]

provides the contents of the Configuration Register.

Although the field is 16-bits long, only bits CF[8:0] are

8 used. All other upper bits are reserved for future

features.

Read Configuration

Register

Command 16 Clocks 16 Clocks 16 Clocks

9

SI

8BH

0000H

0000H

0000H

SO

*The CF Register only uses bits [8:0]

RB[15:0]

Read/Busy

Status

CF{15:0}*

Read Configuration Bits

10

11

12

NexFlash Technologies, Inc.

17

PRELIMINARY NXSF014B-0699

06/11/99

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