AM29LV640MT100REF datasheet(21/66 Pages) AMD

21 / 66 page

February 1, 2007 26190C8

Am29LV640MT/B

D A 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 programmed

with its corresponding programming algorithm. How-

ever, the autoselect codes can 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 set as shown in Table

4. In addition, when verifying sector protection, the

sector address must appear on the appropriate high-

est order address bits (see Tables 2 and 3). Table 4

shows the remaining address bits that are don’t care.

When all necessary bits have been set as required,

the programming equipment can then read the corre-

sponding 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 12 and Table 13.

This method does not require V

ID. See Autoselect

Command Sequence on page 28 for more informa-

tion.

Table 4.

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#

A21

A15

A14

A10

DQ8 to DQ15

DQ7 to DQ0

BYTE#

= V

BYTE#

= V

Manufacturer ID: AMD

VID

01h

Cycle 1

VID

7Eh

Cycle 2

10h

Cycle 3

00 (bottom boot)

01h (top boot)

Sector Protection

Verification

VID

01h (protected),

00h (unprotected)

Secured Silicon Sector

Indicator Bit (DQ7),

WP# protects top two

address sector

VID

98h (factory locked),

18h (not factory locked)

Secured Silicon Sector

Indicator Bit (DQ7),

WP# protects bottom

two address sector

88h (factory locked),

08h (not factory locked)

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