AS29LV800

®

3/22/01; V.1.0

Alliance Semiconductor

P. 6 of 25

March 2001

Command format

1

Bus operations defined in "Mode definitions," on page 3.

2

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

3

Address bits A11-A18 = X = Don’t Care for all address commands except where Program Address and Sector Address are required.

4

Data bits DQ15-DQ8 are don’t care for unlock and command cycles.

5

The Unlock Bypass command must be initiated before the Unlock Bypass Program command.

6

The Unlock Bypass Reset command returns the device to reading array data when it is in the unlock bypass mode.

Command sequence

Required bus

write cycles

1st bus cycle

2nd bus cycle

3rd bus cycle

4th bus cycle

5th bus cycle

6th bus cycle

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Reset/Read

1

XXXh

F0h

Read

Address

Read Data

Reset/Read

×16

3

555h

AAh

2AAh

55h

555h

F0h

Read Address

Read

Data

×8

AAAh

555h

AAAh

Autoselect

ID Read

×16

3

555h

AAh

2AAh

55h

555h

90h

01h

Device code

22DAh (T)

225Bh (B)

×8

AAAh

555h

AAAh

02h

Device code

DAh (T) 5Bh

(B)

×16

555h

AAh

2AAh

55h

555h

90h

00h

MFR code

0052h

×8

AAAh

555h

AAAh

52h

×16

555h

AAh

2AAh

55h

555h

90h

XXX02h

Sector protection

0001h = protected

0000h = unprotected

×8

AAAh

555h

AAAh

XXX04h

Sector protection

0001h=protected

0000h=unprotected

Program

×16

4

555h

AAh

2AAh

55h

555h

A0h

Program Address

Program Data

×8

AAAh

555h

AAAh

Unlock bypass

×16

3

555

AAh

2AA

55h

555

20h

×8

AAA

555

AAA

Unlock bypass program

2

XXX

A0h

Program

address

Program

data

Unlock bypass reset

2

XXX

90h

XXX

00h

Chip Erase

×16

6

555h

AAh

2AAh

55h

555h

80h

555h

AAh

2AAh

55h

555h

10h

×8

AAAh

555h

AAAh

AAAh

555h

AAAh

Sector Erase

×16

6

555h

AAh

2AAh

55h

555h

80h

555h

AAh

2AAh

55h

Sector

Address

30h

×8

AAAh

555h

AAAh

AAAh

555h

Sector Erase Suspend

1

XXXh

B0h

Sector Erase Resume

1

XXXh

30h