AM29LV640MT110REF datasheet(30/66 Pages) AMD

30 / 66 page

Am29LV640MT/B

26190C8 February 1, 2007

D A TA

SH EE T

which the system can read data from an y

non-erase-suspended sector. After completing a pro-

gramming operation in the Erase Suspend mode, the

system can once again read array data with the same

exception. See Erase Suspend/Erase Resume Com-

mands on page 35 for more information.

The system must issue the reset command to return

the device to the read (or erase-suspend-read) mode if

DQ5 goes high during an active program or erase op-

eration, or if the device is in the autoselect mode. See

the next section, Reset Command, for more informa-

tion.

See also Requirements for Reading Array Data on

page 11 in Device Bus Operations for more informa-

tion. See the table, Read-Only Operations on page 45

for the read parameters, and Figure 14 for the timing

diagram.

Reset Command

Writing the reset command resets the device to the

read or erase-suspend-read mode. Address bits are

don’t cares for this command.

The reset command can be written between the se-

quence cycles in an erase command sequence before

erasing begins. This resets the device to the read

mode. Once erasure begins, however, the device ig-

nores reset commands until the operation is complete.

The reset command can be written between the

sequence cycles in a program command sequence

before programming begins. This resets the device to

the read mode. If the program command sequence is

written while the device is in the Erase Suspend mode,

writing the reset command returns the device to the

erase-suspend-read mode. Once programming be-

gins, however, the device ignores reset commands

until the operation is complete.

The reset command can be written between the se-

quence cycles in an autoselect command sequence.

Once in the autoselect mode, the reset command

must be written to return to the read mode. If the de-

vice entered the autoselect mode while in the Erase

Suspend mode, writing the reset command returns the

device to the erase-suspend-read mode.

If DQ5 goes high during a program or erase operation,

writing the reset command returns the device to the

read mode (or erase-suspend-read mode if the device

was in Erase Suspend).

Note that if DQ1 goes high during a Write Buffer Pro-

gramming operation, the system must write the

Write-to-Buffer-Abort Reset command sequence to

reset the device for the next operation.

Autoselect Command Sequence

The autoselect command sequence allows the host

system to read several identifier codes at specific ad-

dresses:

Note: The device ID is read over three cycles. SA = Sector

Address

Tables 12 and 13 show the address and data require-

ments. This method is an alternative to that shown in

Table 4, which is intended for PROM programmers

and requires V

ID on address pin A9. The autoselect

command sequence can be written to an address that

is either in the read or erase-suspend-read mode. The

autoselect command cannot be written while the de-

vice is actively programming or erasing.

The autoselect command sequence is initiated by first

writing two unlock cycles. This is followed by a third

write cycle that contains the autoselect command. The

device then enters the autoselect mode. The system

can read at any address any number of times without

initiating another autoselect command sequence.

The system must write the reset command to return to

the read mode (or erase-suspend-read mode if the de-

vice was previously in Erase Suspend).

Enter Secured Silicon Sector/Exit Secured

Silicon Sector Command Sequence

The Secured Silicon Sector region provides a secured

data area containing an 8-word/16-byte random Elec-

tronic Serial Number (ESN). The system can access

the Secured Silicon Sector region by issuing the

three-cycle Enter Secured Silicon Sector command

sequence. The device continues to access the Se-

cured Silicon Sector region until the system issues the

four-cycle Exit Secured Silicon Sector command se-

quence. The Exit Secured Silicon Sector command

sequence returns the device to normal operation. Ta-

bles 12 and 13 show the address and data require-

ments for both command sequences. See also Secured

Silicon Sector Flash Memory Region for further infor-

mation.

Identifier Code

A7:A0

(x16)

A6:A-1

(x8)

Manufacturer ID

00h

Device ID, Cycle 1

01h

02h

Device ID, Cycle 2

0Eh

1Ch

Device ID, Cycle 3

0Fh

1Eh

Secured Silicon Sector Factory Protect

03h

06h

Sector Protect Verify

(SA)02h

(SA)04h

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