L652DU12RI datasheet(32/54 Pages) AMD

32 / 54 page

Am29LV652D

24961A5 May 5, 2006

D A TA

SH EE T

Command Definitions

Table 10.

Am29LV652D 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# (or CE2#) pulse, whichever

happens later.

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

edge of WE# or CE# (or CE2#) pulse, whichever happens first.

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

erased. Address bits A22–A16 uniquely select any sector.

Notes:

See Table 1, on page 9 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.

Unless otherwise noted, address bits A22–A12 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. See the Autoselect Command Sequence section for more

information.

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

protected sector group.

The Unlock Bypass command is required prior to the Unlock

Bypass Program command.

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

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

11. 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.

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

Suspend mode.

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

device is in autoselect mode.

Command

Sequence

(Note 1)

Bus Cycles (Notes 2–4)

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

XXX

X01

Sector Group Protect Verify

(Note 8)

XXX

(SA)X02

00/01

Program

XXX

Unlock Bypass

XXX

Unlock Bypass Program (Note 9)

XXX

Unlock Bypass Reset (Note 10)

XXX

Chip Erase

XXX

Sector Erase

XXX

Erase Suspend (Note 11)

Erase Resume (Note 12)

CFI Query (Note 13)

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