2
NexFlash Technologies, Inc.
PRELIMINARY NXSF016F-1201
12/12/01 ©
NX25F011B
NX25F021B
NX25F041B
Table of Contents
1M-BIT, 2M-BIT, AND 4M-BIT ......................................................................................................................................... 1
SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE .......................................................................................... 1
FEATURES ..................................................................................................................................................................... 4
DESCRIPTION ............................................................................................................................................................... 4
FUNCTIONAL OVERVIEW ............................................................................................................................................. 5
Pin Descriptions ....................................................................................................................................................... 5
Package ............................................................................................................................................................... 5
Serial Data Input (SI) ............................................................................................................................................ 6
Serial Data Output (SO) ....................................................................................................................................... 6
Serial Clock (SCK) ............................................................................................................................................... 6
Chip Select (CS) .................................................................................................................................................. 6
Write Protect (WP) ............................................................................................................................................... 6
Hold or Ready/Busy (HOLD or R/B) ...................................................................................................................... 6
Power Supply Pins (Vcc and Gnd) ........................................................................................................................ 6
Serial Flash Memory Array ....................................................................................................................................... 7
Serial SRAM ............................................................................................................................................................. 8
Using the SRAM Independent of Flash Memory ................................................................................................... 9
Write Protection ........................................................................................................................................................ 9
Configuration Register .............................................................................................................................................. 9
Write Protect Range and Direction, WR[3:0], WD ................................................................................................ 10
Read Clock Edge, RCE ...................................................................................................................................... 10
Table 2A. Write Protect Range Sector Selection (Hex) ........................................................................................ 11
Table 2B. Write Protect Range Sector Selection (Hex) ........................................................................................ 11
Table 2C. Write Protect Range Sector Selection (Hex) ........................................................................................ 11
HOLD-R/B, HR[1:0] ............................................................................................................................................ 11
Status Register Bit Descriptions ............................................................................................................................. 12
Compare Not Equal, CNE ................................................................................................................................... 12
Power Detect, PD ............................................................................................................................................... 12
Write Enable/Disable, WE ................................................................................................................................... 12
Command Set ........................................................................................................................................................ 13
Command Set for the NX25F011B, NX25F021B and NX25F041B Serial Flash Memory ..................................... 15
SERIAL FLASH SECTOR COMMANDS ....................................................................................................................... 16
Read From Sector (52H) ......................................................................................................................................... 16
Read From Sector with Auto Increment (50H) ......................................................................................................... 16
Read From Sector Low Frequency (51H) and .......................................................................................................... 16
Read From Sector Low Frequency with Auto Increment (5BH) ................................................................................ 16
Write Enable (06H) .................................................................................................................................................. 16
Write Disable (04H) ................................................................................................................................................. 16
Write to Sector Through SRAM (F3H) ..................................................................................................................... 18
SERIAL SRAM COMMANDS ....................................................................................................................................... 19
Write to SRAM Command (72H) ............................................................................................................................. 19
Read from SRAM (71H) .......................................................................................................................................... 19
Transfer All of SRAM to Sector (F3H) ..................................................................................................................... 20
Transfer All of Sector to SRAM (53H) ..................................................................................................................... 20
Compare Sector to SRAM (8DH) ............................................................................................................................ 21
CONFIGURATION AND STATUS COMMANDS ............................................................................................................ 21
Read Configuration Register (8CH) ......................................................................................................................... 21
Write Non-Volatile Configuration
Register (8AH) ........................................................................................................................................................ 22
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