AM29LV065DU101REF datasheet(25/54 Pages) AMD

25 / 54 page

February 16, 2006

Am29LV065D

COMMAND DEFINITIONS

Writing specific address and data commands or se-

quences into the command register initiates device op-

erations. Table 10 defines the valid register command

sequences. Writing incorrect address and data val-

ues or writing them in the improper sequence may

place the device in an unknown state. A reset com-

mand is required to return the device to reading array

data.

All addresses are latched on the falling edge of WE#

or CE#, whichever happens later. All data is latched on

the rising edge of WE# or CE#, whichever happens

first. Refer to the AC Characteristics section for timing

diagrams.

Reading Array Data

The device is automatically set to reading array data

after device power-up. No commands are required to

retrieve data. The device is ready to read array data

after completing an Embedded Program or Embedded

Erase algorithm.

After the device accepts an Erase Suspend command,

the device enters the erase-suspend-read mode, after

which the system can re ad da ta from an y

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

gramming operation in the Erase Suspend mode, the

system may once again read array data with the same

exception. See the Erase Suspend/Erase Resume

Commands section 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 “VersatileIO

TM (V

IO) Control” in the Device

Bus Operations section for more information. The

Read-Only Operations table provides the read param-

eters, and Figure 14 shows 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 may 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 may 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 may 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).

Autoselect Command Sequence

The autoselect command sequence allows the host

system to read several identifier codes at specific ad-

dresses:

Table 10 shows the address and data requirements.

The command sequence is an alternative to the high

voltage method shown in Table 3. The autoselect com-

mand sequence may be written to an address that is

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

autoselect command may not 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

may 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 SecSi Sector/Exit SecSi Sector

Command Sequence

The SecSi Sector region provides a secured data area

containing an 16-byte random Electronic Serial Num-

ber (ESN). The system can access the SecSi Sector

region by issuing the three-cycle Enter SecSi Sector

command sequence. The device continues to access

the SecSi Sector region until the system issues the

four-cycle Exit SecSi Sector command sequence. The

Exit SecSi Sector command sequence returns the de-

Identifier Code

Address

Manufacturer ID

00h

Device ID

01h

SecSi Sector Factory Protect

03h

Sector Group Protect Verify

(SA)02h

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