AM29PL320DB20WPI datasheet(16/49 Pages) AMD

16 / 49 page

Am29PL320D

June 13, 2005

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 input

A9. Address inputs must be as shown in Table 8. In ad-

dition, when verifying sector protection, the sector

address must appear on the appropriate highest order

address bits (Table 4). Table 8 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 13. This method

does not require VID. See “Command Definitions” for

details on using the autoselect mode.

Table 8.

Am29PL320D 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 13.

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and eras e operat ions in an 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 via programming equipment. The procedure

requires high voltage (VID) to be placed on address

input A9 and control input OE#. This method is com-

patible with programmer routines written for earlier

AMD 3.0 volt devices. Publication number 24136 con-

tains further details; contact an AMD representative to

request a copy. For sector unprotect, all unprotected

sectors must first be protected prior to the first sector

unprotect write cycle. Note that after the sector unpro-

tect operation, all previously protected sectors must be

re-protected using the sector protect algorithm.

The device features a temporary unprotect command

sequence to allow changing array data in-system. See

“Te m pora r y Sec t or Unpro t ec t Ena b le/ Dis able

Command Sequence” for more information.

Description

Mode

DQ31–

DQ8

DQ7–DQ0

Manufacturer ID: AMD

VID

01h

Read

Cycle 1

Word

VID

22h

7Eh

Dbl. Word

222222h

Read

Cycle 2

Word

VID

22h

03h

Dbl. Word

222222h

Read

Cycle 3

Word

VID

22h

00h (bottom boot)

01h (top boot)

Dbl. Word

222222h

SecSi

™ Sector Indicator

Bit

VID

80h (factory locked)

00h (not factory locked)

Sector Protection

Verification

VID

01h (protected)

00h (unprotected)

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