AM29LV256ML123REF datasheet(25/69 Pages) AMD

25 / 69 page

December 16, 2005

Am29LV256M

D A TA SH EE T

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector group protection verifica-

tion, through identifier codes output on DQ7–DQ0.

This mode is primarily intended for programming

equipment to automatically match a device to be pro-

grammed with its corresponding programming algo-

rithm. However, the autoselect codes can also be

accessed in-system through the command register.

When using programming equipment, the autoselect

mode requires V

ID on address pin A9. Address pins

A6, A3, A2, 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 (see Table 2). Table 3 shows the remain-

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

sary bits have been 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 Tables 11 and 12. This

method does not require V

ID. Refer to the Autoselect

Command Sequence section for more information.

Table 3.

Autoselect Codes, (High Voltage Method)

Legend: L = Logic Low = V

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

Description

CE#

OE#

WE#

A22

A15

A14

A10

DQ8 to DQ15

DQ7 to DQ0

BYTE#

= V

BYTE#

= V

Manufacturer ID: AMD

VID

01h

Cycle 1

7Eh

Cycle 2

12h

Cycle 3

01h

Sector Group

Protection Verification

VID

01h (protected),

00h (unprotected)

SecSi Sector Indicator

Bit (DQ7), WP#

protects highest

address sector

VID

98h (factory locked),

18h (not factory locked)

SecSi Sector Indicator

Bit (DQ7), WP#

protects lowest

address sector

VID

88h (factory locked),

08h (not factory locked)

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