AM29LV642D datasheet(21/54 Pages) AMD

21 / 54 page

May 5, 2006 25022A2

Am29LV642D

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 (8.5 V to 12.5 V) on address pin A9.

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

Table 4. In addition, when verifying sector protection,

the sector address must appear on the appropriate

highest order address bits (see Table 2 and Table 3).

Table 4 shows the remaining address bits that are

don’t care. When all necessary 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 4.

Am29LV642D Autoselect Codes, (High Voltage Method)

Legend: L = Logic Low = V

IL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Notes:

1. CE# can be replaced with CE2# when referring to the second die in the package.

2. The device ID’s used for the Am29LV642 are the same as the Am29LV640, because the Am29LV642 uses two Am29LV640

dice and appears to the system as two Am29LV640 devices.

Description

CE#

OE#

WE#

A21

A15

A14

A10

DQ15 to DQ0

Manufacturer ID: AMD

0001h

Device ID: Am29LV642D

22D7h

Sector Protection

Verification

XX01h (protected),

XX00h (unprotected)

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