AM29LV033MU datasheet(31/56 Pages) AMD

31 / 56 page

November 11, 2002

Am29LV033MU

ADV ANCE

I N FO RMAT I O N

Command Definitions

Table 10.

Command Definitions

Legend:

X = Don’t care

RA = Read Address of the memory location to be read.

RD = Read Data read from location RA during read operation.

PA = Program Address. Addresses latch on the falling edge of the WE#

or CE# pulse, whichever happens later.

PD = Program Data for location PA. Data latches on the rising edge of

WE# or CE# pulse, whichever happens first.

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

erased. Address bits A21–A16 uniquely select any sector.

WBL = Write Buffer Location. Address must be within the same write

buffer page as PA.

WC = Byte Count. Number of write buffer locations to load minus 1.

Notes:

See Table 1 for 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 and command cycles, when lower address bits are

don’t cares, address bits A21–A12 are also 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. See the Autoselect Command Sequence section for more

information.

The device ID must be read in three cycles.

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

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

protected sector group.

11. Command sequence resets device for next command after

aborted write-to-buffer operation.

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

Bypass Program command.

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

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

14. 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.

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

Suspend mode.

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

device is in autoselect mode.

Command Sequence (Notes)

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)

Reset (Note 6)

XXX

Manufacturer ID

XXX

X00

Device ID (Note 8)

XXX

X01

X0E

X0F

SecSi

 Sector Factory Protect

(Note 9)

XXX

X03

(Note 9)

Sector Group Protect Verify

(Note 10)

XXX

(SA)X02

00/01

Enter SecSi Sector Region

XXX

Exit SecSi Sector Region

XXX

Program

XXX

Write to Buffer

XXX

WBL

Program Buffer to Flash

Write to Buffer Abort Reset (Note 11)

XXX

Unlock Bypass

XXX

Unlock Bypass Program (Note 12)

XXX

Unlock Bypass Reset (Note 13)

XXX

Chip Erase

XXX

Sector Erase

XXX

Program/Erase Suspend (Note 14)

Program/Erase Resume (Note 15)

CFI Query (Note 16)

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