AM29LV033C datasheet(15/49 Pages) AMD

15 / 49 page

22268B5 September 12, 2006

Am29LV033C

DA TA

SH EET

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equip-

ment to automatically match a device to be pro-

grammed with its corresponding programming

algorithm. However, the autoselect codes can also be

accessed in-system through the command register.

When using programming equipment, the autoselect

mode requires V

ID (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown in

Table 3. In addition, when verifying sector protection,

the sector address must appear on the appropriate

highest order address bits. Table 3 shows the remain-

ing address bits that are don’t care. When all neces-

sar y bits are set as required, the programming

equipment may then read the corresponding identifier

code on DQ7-DQ0.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 9, on page 25.

This method does not require V

ID. See “Writing spe-

cific address and data commands or sequences into

the command register initiates device operations.

Table 9, on page 25 defines the valid register com-

mand sequences. Writing incorrect address and data

values or writing them in the improper sequence re-

sets the device to reading array data.” for details on

using the autoselect mode.

Table 3.

Am29LV033C Autoselect Codes (High Voltage Method)

L = Logic Low = V

IL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Sector/Sector Block Protection and

Unprotection

(Note: For the following discussion, the term “sector”

applies to both sectors and sector blocks. A sector

block consists of two or more adjacent sectors that are

protected or unprotected at the same time (see Table 4,

on page 16).

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both pro-

gram and erase operations in previously protected

sectors. Sector protection/unprotection can be imple-

mented via two methods.

The primary method requires V

ID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 2, on page 17 shows

the algorithms and Figure 22, on page 41 shows the

timing diagram. This method uses standard micropro-

cessor bus cycle timing. For sector unprotect, all un-

protected sectors must first be protected prior to the

first sector unprotect write cycle.

The alternate method intended only for programming

equipment requires VID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices.

Publication number 22269 contains further details;

contact an AMD representative to request a copy.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is pro-

tected or unprotected. See “Autoselect Mode” on

page 15 for details.

Description

CE#

OE#

WE#

A21

A16

A15

A10

DQ7

DQ0

Manufacturer ID: AMD

01h

Device ID: Am29LV033C

A3h

Sector Protection Verification

01h

(protected)

00h

(unprotected)

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