AM29PLI60C datasheet(13/44 Pages) AMD

13 / 44 page

Am29PL160C

June 12, 2002

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 equipment

to automatically match a device to be programmed

with its corresponding programming algorithm. How-

ever, 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 5. In addition, when verifying sector protection,

the sector address must appear on the appropriate

highest order address bits (Table 4). Table 5 shows the

remaining address bits that are don’t care. When all

necessary bits have been set as required, the pro-

gr amm i n g eq ui pme n t m a y

then

r ead

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 VID. See “Command Definitions” for

details on using the autoselect mode.

Table 5.

Am29PL160C 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 10.

Sector Protection/Unprotection

The hardware sector protection feature disables both

pr ogr am and er as e o per ati ons i n a n y s e c t or.

The hardware 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 protected

or unprotected. See “Autoselect Mode” for details.

Sector protection and unprotection must be imple-

mented using programming equipment. The procedure

requires VID on address pin A9 and OE#. Details on

this method are provided in a supplement, publication

number 22239. Contact an AMD representative to re-

quest a copy.

The device features a temporary unprotect command

sequence to allow changing array data in-system. See

“Temporary Unprotect Enable/Disable Command Se-

quence” for more information.

Description

Mode

CE#

OE#

WE#

A19

A12

A11

A10

DQ8

DQ15

DQ7

DQ0

Manufacturer ID: AMD

VID

01h

Device ID:

Am29PL160C

(Bottom Boot Block)

Word

VID

22h

45h

Byte

45h

Sector Protection Verification

VID

01h

(protected)

00h

(unprotected)

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