AM29F017D datasheet(12/41 Pages) AMD

12 / 41 page

Am29F017D

21195E5 September 12, 2006

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 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

Autoselect Codes (High Voltage Method) table. In addi-

tion, when verifying sector protection, the sector ad-

dress must appear on the appropriate highest order

address bits. Refer to the corresponding Sector Ad-

dress Tables. The Command Definitions table shows

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

necessary bits have been set as required, the program-

ming 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 the Command Defini-

tions table. This method does not require VID. See

“Command Definitions” for details on using the autose-

lect mode.

Table 3.

Am29F017D Autoselect Codes (High Voltage Method)

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

Sector Group Protection/Unprotection

The hardware sector group protection feature dis-

ables both program and erase operations in any sec-

tor. Each sector group consists of four adjacent

sectors. Table 4 shows how the sectors are goruped,

and the address range that each sector group con-

tains. The hardware sector group unprotection fea-

ture re-enables both program and erase operations in

previously protected sectors.

Sector group protection/unprotection must be imple-

mented using programming equipment. The procedure

requires a high voltage (VID) on address pin A9 and the

control pins. Details on this method are provided in a

supplement, publication number 23923. Contact an

AMD representative to obtain a copy of the appropriate

document. Note that the sector group protection and

unprotection scheme differs from that used with the

previous versions of this device, the Am29F017B.

The device is shipped with all sector groups unpro-

tected. AMD offers the option of programming and pro-

tecting 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 group is

protected or unprotected. See “Autoselect Mode” for

details.

Table 4.

Sector Group Addresses

Temporary Sector Group Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors groups to change data in-sys-

tem. The Sector Group Unprotect mode is activated

by setting the RESET# pin to VID. During this mode,

formerly protected sector groups can be programmed

or erased by selecting the sector group addresses.

Description

CE#

OE# WE# A20-A18

A17-A10

A8-A7

A5-A2

DQ7-DQ0

Manufacturer ID:

AMD

VID

XVIL

VIL

01h

Device ID:

Am29F017D

VID

XVIL

VIH

3Dh

Sector Group

Protection

Verification

Sector

Group

Address

XVID

XVIL

XVIH

VIL

01h (protected)

00h (unprotected)

Sector

Group

A20

A19

A18

Sectors

SGA0

SA0

–SA3

SGA1

SA4

–SA7

SGA2

SA8

–SA11

SGA3

SA12

–SA15

SGA4

SA16

–SA19

SGA5

SA20

–SA23

SGA6

SA24

–SA27

SGA7

SA28

–SA31

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