AM29LV033MU datasheet(15/56 Pages) AMD

15 / 56 page

November 11, 2002

Am29LV033MU

ADV ANCE

I N FO RMAT I O 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-

grammed with its co rresponding programm ing

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 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

DQ7 to DQ0

Manufacturer ID: AMD

VID

XLXL

01h

Cycle 1

XLX

7Eh

Cycle 2

1Ch

Cycle 3

00h

Sector Protection

Verification

XLXL

01h (protected),

00h (unprotected)

SecSi Sector Indicator Bit

(DQ7)

XLXL

90h (factory locked),

10h (not factory locked)

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