AM29LV128ML93REF datasheet(20/66 Pages) AMD

20 / 66 page

Am29LV128MH/L

25270C7 January 31, 2007

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 Table 10 and Table 11.

This method does not require V

ID. See “Autoselect

Command Sequence” on page 29 for more informa-

tion.

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

00h

Sector Group

Protection Verification

VID

01h (protected),

00h (unprotected)

Secured Silicon Sector

Indicator Bit (DQ7),

WP# protects highest

address sector

VID

98h (factory locked),

18h (not factory locked)

Secured Silicon Sector

Indicator Bit (DQ7),

WP# protects lowest

address sector

VID

88h (factory locked),

08h (not factory locked)

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