L640DU21NF datasheet(30/57 Pages) AMD

30 / 57 page

Am29LV640D/Am29LV641D

22366C6 January 22, 2007

D A TA

SH EET

Command Definitions

Table 10.

Command Definitions

Legend:

X = Don’t care

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed. Addresses

latch on the falling edge of the WE# or CE# pulse, whichever happens

later.

PD = Data to be programmed at location PA. Data latches on the rising

edge of WE# or CE# pulse, whichever happens first.

SA = Address of the sector to be verified (in autoselect mode) or

erased. Address bits A21–A15 uniquely select any sector.

Notes:

See Table 1 on page 10 for a description of bus operations.

All values are in hexadecimal.

Except for the read cycle and the fourth cycle of the autoselect

command sequence, all bus cycles are write cycles.

During unlock cycles, (when lower address bits are 555 or 2AAh

as shown in table) address bits higher than A11 (except where BA

is required) and data bits higher than DQ7 are don’t cares.

No unlock or command cycles required when device is in read

mode.

The Reset command is required to return to the read mode (or to

the erase-suspend-read mode if previously in Erase Suspend)

when the device is in the autoselect mode, or if DQ5 goes high

(while the device is providing status information).

The fourth cycle of the autoselect command sequence is a read

cycle. Data bits DQ15–DQ8 are don’t care. See the “Autoselect

Command Sequence” on page 24 section for more information.

If WP# protects the highest address sector (or if WP# is not

available), the data is 98h for factory locked and 18h for not

factory locked. If WP# protects the lowest address sector, the

data is 88h for factory locked and 08h for not factor locked.

The data is 00h for an unprotected sector group and 01h for a

protected sector group.

10. The Unlock Bypass command is required prior to the Unlock

Bypass Program command.

11. The Unlock Bypass Reset command is required to return to the

read mode when the device is in the unlock bypass mode.

12. The system may read and program in non-erasing sectors, or

enter the autoselect mode, when in the Erase Suspend mode.

The Erase Suspend command is valid only during a sector erase

operation.

13. The Erase Resume command is valid only during the Erase

Suspend mode.

14. Command is valid when device is ready to read array data or when

device is in autoselect mode.

Command

Sequence

Bus Cycles (Notes 1–4)

First

Second

Third

Fourth

Fifth

Sixth

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Read (Note 5)1

Reset (Note 6)1

XXX

Manufacturer ID

555

2AA

555

X00

0001

Device ID

555

2AA

555

X01

22D7

SecSi

™ Sector Factory

Protect (Note 8)

555

2AA

555

X02

see

(Note

Sector Group Protect Verify

(Note 9)

555

2AA

555

(SA)X02

XX00/

XX01

Enter SecSi Sector Region

555

2AA

555

Exit SecSi Sector Region

555

2AA

555

XXX

Program

555

2AA

555

Unlock Bypass

555

2AA

555

Unlock Bypass Program (Note 10)

XXX

Unlock Bypass Reset (Note 11)

XXX

Chip Erase

555

2AA

555

2AA

555

Sector Erase

555

2AA

555

2AA

Erase Suspend (Note 12)1

XXX

Erase Resume (Note 13)1

XXX

CFI Query (Note 14)1

L640DU21NF Datasheet(PDF) 30 Page - Advanced Micro Devices

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