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1

Bus operations defined in "Mode definitions," on page 4.

2

Reading data from or programming data to non-erasing sectors allowed in Erase Suspend mode.

3

Address bit A15 = X = Don’t care for all address commands except Program Address and Sector Address.

4

Address bit A16 = X = Don’t care for all address commands except Program Address and Sector Address.

5

System should generate address patterns: ×16 mode - 5555h or 2AAAh to address A0–A14; ×8 mode - AAAAh or 5555h to address A-1–A14.

Sector erase timer

(DQ3)

Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands

will be accepted. If DQ3 = 0, the device will accept sector erase commands. Check DQ3 before and

after each sector erase command to verify that the command was accepted.

Toggle bit 2 (DQ2)

During sector erase, DQ2 toggles with OE or CE only during an attempt to read a sector being

erased. During chip erase, DQ2 toggles with OE or CE for all addresses. If DQ5 = 1, DQ2 toggles

only at sector addresses where failure occurred, and will not toggle at other sector addresses. Use

DQ2 in conjunction with DQ6 to determine whether device is in auto erase or erase suspend

mode.

Command sequence

Required

bus cycles

1st bus write cycle

2nd bus

write cycle

3rd bus

write cycle

4th bus

read/write cycle

5th bus

write cycle

6th bus

write cycle

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Reset/Read

1

XXXXh

F0h

Read

Address

Read Data

Reset/Read

×16

4

5555h

AAh

2AAAh

55h

5555h

F0h

Read

Address

Read

Data

×8

AAAAh

5555h

AAAAh

Autoselect

ID Read

×16

4

5555h

AAh

2AAAh

55h

5555h

90h

01h

2251h (T)

2257h (B)

×8

AAAAh

5555h

AAAAh

02h

51h (T)

57h (B)

×16/×8

00h

MFR code

52h

×16

XXX02h

01 = protected

00 = unprotected

×8

XXX04h

Program

×16

4

5555h

AAh

2AAAh

55h

5555h

A0h

Program

Address

Program

Data

×8

AAAAh

5555h

AAAAh

Chip Erase

×16

6

5555h

AAh

2AAAh

55h

5555h

80h

5555h

AAh

2AAAh

55h

5555h

10h

×8

AAAAh

5555h

AAAAh

AAAAh

5555h

AAAAh

Sector Erase

×16

6

5555h

AAh

2AAAh

55h

5555h

80h

5555h

AAh

2AAAh

55h

Sector

Address

30h

×8

AAAAh

5555h

AAAAh

AAAAh

5555h

Sector Erase Suspend

1

XXXXh

B0h

Sector Erase Resume

1

XXXXh

30h