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

ST7 ST6 ST5 ST4 ST3 ST2 ST1 ST0

1

x =RESERVED Busy TR X WE CNE X X X

2

READ/BUSY

3

SRAM AND PROGRAM

BUFFER TRANSFER

FLASH ARRAY WRITE

ENABLE/DISABLE

4

SECTOR-SRAM

COMPARE NOT EQUAL

5

Figure 8. Status Register Bit Locations

6

Compare Not Equal, CNE

The CNE status bit is located at bit ST[3] of the status

register. The bit provides a cumulative comparison result

during a Compare Sector with SRAM command. The CNE

bit is reset to a 0 upon power-up or after a Clear Compare

Bit command is executed.

CNE=1 Sector and SRAM contents are not equal.

CNE=0 Sector and SRAM are equal or CNE bit reset.

Command Set

The NX25F011A and NX25F041A have a powerful com-

mand set that is fully controlled through the SPI bus.

Command relations are shown in Figure 5 and a list of

commands and their associated address, status, clock,

and data bytes are shown in Table 3. Detailed clock timing

of the Read Sector and Write Sector command sequences

are shown in Figures 10 and 11.

7

After power up, a device enters an idle state that will

8 maintain until CS pin is asserted low. All commands are

entered from the SPI serial data input (SI) pin on the rising

edge of SCK while CS is asserted low. All command,

address, and configuration bits are shifted into the device

9 with most-significant-bit-first. Data bits read from the

device are shifted out with least significant byte first

(i.e., byte-00H, byte-01H,...). The bit order within each

10 byte is most-significant-bit first (i.e.,D7,...D0). All com-

mands are completed by asserting the CS pin high.

Note that the entire 264-byte contents of a Flash sector,

11 the SRAM, or Program Buffer does not have to be ac-

cessed all at once. Read, Write, Transfer, and Compare

commands allow for byte addressing. Thus a single byte,

or clocked sequence of bytes, can be accessed at any

12 starting location within the 264-byte boundary as specified

by the byte-address field.

NexFlash Technologies, Inc.

9

PRELIMINARY NXSF014B-0699

06/11/99

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