AM29F004B datasheet(12/37 Pages) AMD

12 / 37 page

Am29F004B

8/5/05

AD VA NC E

IN FO RM AT ION

Autoselect Mode

The autoselect mode provides manufacturer and device iden-

tification, 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 algo-

rithm. However, the autoselect codes can also be accessed

in-system through the command register.

When using programming equipment, the autoselect mode

requires VID on address pin A9. Address pins A6, A1, and A0

must be as shown in Autoselect Codes (High Voltage

Method) table. In addition, when verifying sector protection,

the sector address must appear on the appropriate highest

order address bits. Refer to the corresponding Sector

Address Tables. The Command Definitions table shows the

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

sary bits are 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 the Command Definitions table. This method

does not require VID. See Command Definitions on page 13

for details on using the autoselect mode.

Table 4.

Am29F004B Autoselect Codes (High Voltage Method)

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

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The hardware

sector unprotection feature re-enables both program and

erase operations in previously protected sectors.

The primary method requires VID on the OE# pin only, and

can be implemented either in-system or via programming

equipment. Figure 1, on page 11 and 2 show the algorithms

and Figure 16, on page 28, Figure 17, on page 28, and Figure

18, on page 29 show the timing diagrams. This method uses

standard microprocessor bus cycle timing in addition to the

sector unlock and sector relock sequences. For sector unpro-

tect, all unprotected sectors must first be protected prior to

the first sector unprotect write cycle.

The alternate method intended only for programming equip-

ment required VID on address pin A9 and OE#. This method

is compatible with programmer routines written for earlier 5.0

volt-only AMD Flash devices. Publication number 22289 con-

tains further details; contact an AMD representative to

request a copy.

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 Express-

Flash™ Service. Contact an AMD representative for details.

It is possible to determine whether a sector is protected or

unprotected. See Autoselect Mode on page 10 for details.

Description

CE#

OE#

WE#

A18

A13

A12

A10

DQ7

DQ0

Manufacturer ID: AMD

VID

01h

Device ID:

Am29F004B (Top Boot Block)

VID

77h

Device ID:

Am29F004B (Bottom Boot Block)

VID

7Bh

Sector Protection Verification

VID

01h (protected)

00h

(unprotected)

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