AM29LV320ML112REF datasheet(17/59 Pages) SPANSION

17 / 59 page

December 14, 2005

Am29LV320MH/L

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 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 10 and 11. 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#

A20

A15

A14

A10

DQ8 to DQ15

DQ7 to DQ0

BYTE#

= V

BYTE#

= V

Manufacturer ID: AMD

01h

Cycle 1

7Eh

Cycle 2

1Dh

Cycle 3

00h

Sector Protection

Verification

01h (protected),

00h (unprotected)

SecSi Sector Indicator

Bit (DQ7), WP#

protects highest

address sector

98h (factory locked),

18h (not factory locked)

SecSi Sector Indicator

Bit (DQ7), WP#

protects lowest

address sector

88h (factory locked),

08h (not factory locked)

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