NX25F641C データシートの表示（PDF） - NexFlash -> Winbond Electronics

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NX25F641C

64M-BIT SERIAL FLASH MEMORY WITH 4-PIN SPI INTERFACE

NexFlash -> Winbond Electronics 

NX25F641C

Serial Flash Memory Array

The NX25F641C Serial Flash memory array is

organized as 16,384 sectors of 528-bytes (4,224 bits)

each, as shown in Figure 3. The block size of the device is

64 sectors, yielding 256 blocks for the NX25F641C.

The Serial Flash memory of the NX25F641C is

byte-addressable for read operations. This allows a single

byte, or specified sequence of bytes, to be read without

having to clock an entire 528-byte sector out of the device.

Data can be read directly from the array using a Read

Sector Command or through one of two 528-byte SRAM

buffers by using the Transfer Sector to SRAM and Read

SRAM commands. Data can be written to the Flash

memory array one sector (528-bytes) at a time through the

Serial SRAM using a Write to Sector command or a

Transfer SRAM to Sector command. No pre-erase is

needed. Instead, the device incorporates an auto-erase-

before-write feature that automatically erases the ad-

dressed sector at the beginning of the write operation.

After completing the command the memory array will

become busy while it is programming the specified non-

volatile memory cells of that sector. This busy time will not

exceed tWP during which time the Flash array is unavail-

able for read or write access. The device can be tested to

determine the array’s availability using the Ready/Busy

status that is available during most read commands,

through the status register, or on the Ready/Busy pin.

Sector Address:

25F641C

S[13:0]

Block 256

Sector 16383

3FFFH

Sector 16320

3FD0H

Block 0

Sector 63

002FH

Sector 0

0000H

Byte 0

000H

Byte Address: B[9:0]

Byte 1

001H

Byte 2-525

002H-20DH

Byte 526 Byte 527

20EH

20FH

64M-bit Serial Flash Memory Array

16,384 Sectors of 528-Bytes each.

Organized in 256 blocks of 64 sectors per block.

Byte 0

000H

Byte 1

001H

Byte 2-525

002H-207H

Byte 526 Byte 527

208H

209H

Figure 3. NX25F641C Serial Flash Memory Array

NexFlash Technologies, Inc.

7

PRELIMINARY NXSF032A-0502

05/06/02 ©

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