L320DB90VC datasheet(18/57 Pages) AMD

18 / 57 page

Am29LV320D

December 14, 2005

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 (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown in

Table 6 on page 16. In addition, when verifying sector

protection, the sector address must appear on the ap-

propriate highest order address bits (see Table 2 on

page 13 through Table 5 on page 15). Table 6 on

page 16 shows the remaining address bits that are

don’t care. When all necessary bits are set as re-

quired, 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 14 on page 29.

This method does not require V

ID. Refer to the “Au-

toselect Command Sequence” on page 25 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, SA = Sector Address, X = Don’t

care.

Description

CE#

OE#

WE#

A20

A12

A11

A10

DQ8 to DQ15

DQ7

DQ0

BYTE#=

BYTE#

= V

Manufacturer ID: AMD

XLXL

01h

Device ID: Am29LV320D

22h

F6 (T), F9h (B)

Sector Protection Verification

XLX

01h (protected),

00h (unprotected)

Secured Silicon Sector

Indicator Bit (DQ7)

XLX

99h (factory locked),

19h (not factory locked)

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