AM29LV160BT-70REF datasheet(17/54 Pages) AMD

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Am29LV160B

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 au tomatically ma tch a device to be

programmed with its corresponding programming al-

gorithm. 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 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 9. This method

does not require VID. See “Command Definitions” for

details on using the autoselect mode.

Table 4.

Am29LV160B 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 Table 9.

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both

program and erase operations in previously protected

sectors.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is pro-

tected or unprotected. See “Autoselect Mode” for

details.

Sector protection/unprotection can be implemented

via two methods.

The primary method requires VID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 2 shows the algo-

rithms and Figure 22 shows the timing diagram. This

method uses standard microprocessor bus cycle tim-

ing. For sector unprotect, all unprotected sectors must

first be protected prior to the first sector unprotect

write cycle.

The alternate method intended only for programming

equipment requires VID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices. De-

tails on this method are provided in a supplement,

publication number 21468. Contact an AMD represen-

tative to request a copy.

Description

Mode

CE#

OE#

WE#

A19

A12

A11

A10

DQ8

DQ15

DQ7

DQ0

Manufacturer ID: AMD

VID

01h

Device ID:

Am29LV160B

(Top Boot Block)

Word

VID

22h

C4h

Byte

C4h

Device ID:

Am29LV160B

(Bottom Boot Block)

Word

VID

22h

49h

Byte

49h

Sector Protection Verification

VID

01h

(protected)

00h

(unprotected)

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