NX26F640C-3T データシートの表示（PDF） - NexFlash -> Winbond Electronics

部品番号

コンポーネント説明

メーカー

NX26F640C-3T

64M-BIT SERIAL FLASH MEMORY WITH 2-PIN NXS2 INTERFACE

NexFlash -> Winbond Electronics 

NX26F640C

Serial Flash Memory Array

The NX26F640C Serial Flash memory array is

organized as 16,384 sectors of 522-bytes (4,176 bits)

each, as shown in Figure 4. The block size of the device is

64 sectors, yielding 256 blocks for the NX26F640C.

The Serial Flash memory of the NX26F640C 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 522-byte sector out of the device.

All data is read through one of two 522-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 (522-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 addressed 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 unavailable for read or write access.

The device can be tested to determine the array’s avail-

ability using the Ready/Busy status that is available during

most read commands, through the status register, or on

the Ready/Busy pin.

Restricted Sector (-R) Devices

Restricted sector devices provide a more cost-effective

alternative to standard devices that have 100% valid sec-

tors. Restricted sector devices have a limited numbers of

sectors (maximum of 64) that do not meet manufacturing

criteria over the specified operating range. Restricted sector

devices are factory-formatted with a list of the factory tested

restricted sector addresses is stored in the device informa-

tion sector which is assessable with command 15H. See

Device Information Sector (DIS) specification. Please note

that standard devices, with 100% valid sectors, are not

formatted with the first byte set to C9H.

Sector Address:

26F640C

S[13:0]

Block 256

Sector 16383

3FFFH

Sector 16320

3FD0H

Byte 0

000H

Byte Address: B[9:0]

Byte 1

001H

Byte 2-519

002H-207H

Byte 520 Byte 521

208H

209H

64M-bit Serial Flash Memory Array

16,384 Sectors of 522-Bytes each.

Organized in 256 blocks of 64 sectors per block.

Block 0

Sector 63

002FH

Sector 0

0000H

Byte 0

000H

Byte 1

001H

Byte 2-519

002H-207H

Byte 520 Byte 521

208H

209H

Figure 4. NX26F640C Serial Flash Memory Array

NexFlash Technologies, Inc.

7

PRELIMINARY NXSF020D-0902

09/05/02 ©

Share Link: