NX25F080A-5TI-R データシートの表示（PDF） - NexFlash -> Winbond Electronics

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NX25F080A-5TI-R

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

NexFlash -> Winbond Electronics 

NX25F080A

S7 S6 S5 S4 S3 S2 S1 S0

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 & SRAM contents are not equal.

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

Command Set

The NX25F080A has a powerful command 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 is shown in

Figures 10 and 11.

7

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

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,

9 address, and configuration bits are shifted into the device

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 536-byte contents of a Flash sector, the

11 SRAM, or Program Buffer does not have to be

accessed 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 536-byte boundary as specified

by the byte-address field.

NexFlash Technologies, Inc.

9

PRELIMINARY NXSF005C-0699

06/11/99 ©

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