AM29LV640MU datasheet(16/58 Pages) AMD

16 / 58 page

June 12, 2003

Am29LV640MU

AD V A NCE

INF O R M A T IO N

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-

gra mm ed w it h its co rresp on ding p rog ram min g

algorithm. However, the autoselect codes can also be

accessed in-system through the command register.

When using programming equipment, the autoselect

mode requires VID 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. This method

does not require V

ID. Refer to the Autoselect Com-

mand 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#

A21

A15

A14

A10

DQ15 to DQ0

Manufacturer ID: AMD

0001h

Cycle 1

227Eh

Cycle 2

2213h

Cycle 3

2201h

Sector Protection

Verification

XX01h (protected),

XX00h (unprotected)

SecSi Sector Indicator Bit

(DQ7)

XX98h (factory locked),

XX18h (not factory locked)

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