L320DB12VC datasheet(27/57 Pages) AMD

27 / 57 page

December 14, 2005

Am29LV320D

DA TA SH EET

COMMAND DEFINITIONS

Writing specific address and data commands or se-

quences into the command register initiates device op-

erations. Table 14 on page 29 defines the valid

rect address and data values or writing them in the im-

proper sequence may place the device in an unknown

state. A reset command is required to return the de-

vice to normal operation.

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 “Erase Suspend/Erase Resume Com-

mands” on page 28 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 for more information. The Read-Only Opera-

tions table provides the read parameters, and Figure

14, on page 38 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 which the

system was writing to the read mode. Once erasure

begins, however, the device ignores 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

which the system was writing to the read mode. If the

program command sequence is written to a sector that

is in the Erase Suspend mode, writing the reset

command retur ns the device to the erase-sus-

pend-read mode. Once programming begins, 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 13.

Autoselect Codes

Table 14 on page 29 shows the address and data re-

quirements. This method is an alternative to that

shown in Table 6 on page 16, which is intended for

PROM programmers and requires VID on address pin

A9. The autoselect command sequence may be writ-

ten to an address within sector that is either in the read

or erase-suspend-read mode. The autoselect com-

mand may not be written while the device 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 Secured Silicon Sector/Exit Secured

Silicon Sector Command Sequence

The Secured Silicon sector provides a secured data

area containing a random, sixteen-byte electronic se-

rial number (ESN). The system can access the Se-

cured Silicon sector by issuing the three-cycle Enter

Secured Silicon sector command sequence. The de-

vice continues to access the Secured Silicon sector

until the system issues the four-cycle Exit Secured Sil-

Identifier Code

Address

Manufacturer ID

00h

Device ID

01h

Secured Silicon Sector

Factory Protect

03h

Sector Group Protect Verify

(SA)02h

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