AM29LV001BB-45RECB 查看數據表（PDF） - Advanced Micro Devices

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AM29LV001BB-45RECB

1 Megabit (128 K x 8-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

Autoselect Mode

The autoselect mode provides manufacturer and

device 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

Table 4. In addition, when verifying sector protection,

the sector address must appear on the appropriate

highest order address bits (see Table 2). Table 4 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 Table 5. This method

does not require VID. See “Command Definitions” for

details on using the autoselect mode.

Table 4. Am29LV001B Autoselect Codes

Description

Manufacturer ID: AMD

Device ID: Am29LV001BT

(Top Boot Block)

Device ID: Am29LV001BB

(Bottom Boot Block)

A16 A11

A8

A5

to to

to

to

CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0

L

L

H

X

X VID X

L

X

L

L

L

L

H

X

X VID X

L

X

LH

L

L

H

X

X VID X

L

X

LH

DQ7

to

DQ0

01h

EDh

6Dh

01h

(protected)

Sector Protection Verification L

L

H SA X VID X

L

X

H

L

00h

(unprotected)

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 hard-

ware sector unprotection feature re-enables both

program and erase operations in previously protected

sectors. Sector protection/unprotection can be imple-

mented 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 1 shows the algo-

rithms and Figure 21 shows the timing diagram. This

method uses standard microprocessor bus cycle

timing. 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, OE#, and

RESET#. This method is compatible with programmer

routines written for earlier 3.0 volt-only AMD flash

devices. Publication number 22134 contains 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 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.

Temporary Sector Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the

RESET# pin to VID. During this mode, formerly pro-

tected sectors can be programmed or erased by

selecting the sector addresses. Once VID is removed

from the RESET# pin, all the previously protected

sectors are protected again. Figure 2 shows the algo-

rithm, and Figure 20 shows the timing diagrams, for

this feature.

September 26, 2002

Am29LV001B

11

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