NX25F640C-3T データシートの表示（PDF） - NexFlash -> Winbond Electronics

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NX25F640C-3T

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

NexFlash -> Winbond Electronics 

NX25F640C

Table of Contents

64M-BIT SERIAL FLASH MEMORY

WITH 4-PIN SPI INTERFACE ........................................................................................................................................ 1

FEATURES .................................................................................................................................................................... 4

DESCRIPTION ............................................................................................................................................................... 4

Pin Descriptions ..................................................................................................................................................... 6

Serial Data Input (SI) ........................................................................................................................................... 6

Serial Data Output (SO)....................................................................................................................................... 6

Chip Select (CS) .................................................................................................................................................. 6

Write Protect Input (WP) ...................................................................................................................................... 6

Hold , Ready/Busy or No-connect

(Hold, R/B or N/C) ................................................................................................................................................ 6

Power Supply Pins (Vcc and Gnd) ....................................................................................................................... 6

Table 1. Pin Descriptions for the 25F640 ............................................................................................................. 6

Serial Flash Memory Array .................................................................................................................................... 7

Restricted Sector (-R) Devices .............................................................................................................................. 7

Serial SRAM ............................................................................................................................................................ 8

Using the SRAM Independent of Flash Memory .................................................................................................. 8

Write Protection ..................................................................................................................................................... 9

Configuration Register .......................................................................................................................................... 9

Write Protect Range and Direction, WR[3:0], WD ................................................................................................ 9

Read Clock Edge, RCE ....................................................................................................................................... 9

HOLD-R/B, HR[1:0] ........................................................................................................................................... 10

Table 2. Write Protect Range Sector Selection .................................................................................................. 10

Status Register Bit Descriptions ........................................................................................................................ 10

Ready/Busy Status, BUSY ................................................................................................................................ 10

SRAM Transfer, TR0 and TR1 ............................................................................................................................ 10

Write Enable/Disable, WE .................................................................................................................................. 11

Power Detect, PD .............................................................................................................................................. 11

Data Intergrity Status (DI1, DI0) ........................................................................................................................ 11

Command Set ....................................................................................................................................................... 12

Table 3: Command Set for the NX25F640C Serial Flash Memory ..................................................................... 13

SERIAL FLASH SECTOR AND SRAM READ COMMANDS ...................................................................................... 15

Transfer Sector to SRAM (5CH and 5DH) ........................................................................................................... 15

Read SRAM (71H and 73H) .................................................................................................................................. 15

2

NexFlash Technologies, Inc.

PRELIMINARY NXSF022F-0502

05/20/02 ©

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