AM29LV160M datasheet(17/60 Pages) AMD

17 / 60 page

August 11, 2003 25974B0

Am29LV160M

Prelimin ary

Autoselect Mode

The autoselect mode provides manufacturer and device identification, and sector

protection verification, through identifier codes output on DQ7–DQ0. This mode

is primarily intended for programming equipment to automatically match a device

to be programmed 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 VID (11.5 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 Tables 2 and 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 cor-

responding identifier code on DQ7-DQ0.

To access the autoselect codes in-system, the host system can issue the autose-

lect command via the command register, as shown in Tables 10–11. This method

does not require VID. See “Command Definitions” for details on using the autose-

lect mode.

Table 4. Autoselect Codes (High Voltage Method)

L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Note: The autoselect codes may also be accessed in-system via command sequences. See Tables 10–11.

Sector Protection/Unprotection

The hardware sector protection feature disables both program and erase opera-

tions in any sector. The hardware sector unprotection feature re-enables both

program and erase operations in previously protected sectors.

The device is normally shipped with all sectors unprotected. However, the Ex-

pressFlash™ Service offers the option of programming and protecting sectors at

the factory prior to shipping the device. Contact a sales office or representative

for details.

It is possible to determine whether a sector is protected or unprotected. See “Au-

toselect Mode” for details.

Sector protection and unprotection requires VID on the RESET# pin only, and can

be implemented either in-system or via programming equipment. Figure 2 shows

Description

Mode CE# OE# WE#

A19

A12

A11

A10 A9

DQ8

DQ15

DQ7

DQ0

Manufacturer ID

VID

01h (AMD)

Device ID:

Am29LV160M

(Top Boot Block)

Word

VID

22h

C4h

Byte

C4h

Device ID:

Am29LV160M

(Bottom Boot

Block)

Word

VID

22h

49h

Byte

49h

Sector Protection

Verification

VID

01h

(protected)

00h

(unprotected)

AM29LV160M Datasheet(PDF) 17 Page - Advanced Micro Devices

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