AM29DS320G datasheet(16/54 Pages) SPANSION

16 / 54 page

January 27, 2003

Am29DS320G

AD VA NCE

I N FO RM ATI 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, A1, and A0 must be as shown in Table 6. In addi-

tion, when verifying sector protection, the sector ad-

dress must appear on the appropriate highest order

address bits (see Table 2). Table 6 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 13. This method

does not require V

ID. Refer to the Autoselect Com-

mand Sequence section for more information.

Table 6.

Autoselect Codes, (High Voltage Method)

Legend: T = Top Boot Block, B = Bottom Boot Block, L = Logic Low = V

IL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X

= Don’t care.

Notes:

The bank address bits are A20–A18.

The device ID must be read across three cycles.

Description

CE# OE# WE#

A20

A12

A11

A10

DQ15 to DQ8

DQ7

DQ0

BYTE#

= V

BYTE#

= V

Manufacturer ID:

AMD

01h

Read Cycle 1

LLL

22h

7Eh

Read Cycle 2

HHH

22h

0Bh

Read Cycle 3

HHHH

22h

01h (T), 00h (B)

Sector Protection

Verification

01h (protected),

00h (unprotected)

SecSi

 Indicator

Bit (DQ7)

81h (factory locked),

01h (not factory

locked)

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