AM29BDD160G datasheet(29/79 Pages) AMD

29 / 79 page

June 7, 2006

Am29BDD160G

1. It permanently sets the device to operate using the

Password Protection Mode. It is not possible to re-

verse this function.

2. It also disables all further commands to the pass-

word region. All program, and read operations are

ignored.

Both of these objectives are important, and if not care-

fully considered, may lead to unrecoverable errors.

The user must be sure that the Password Protection

method is desired when setting the Password Mode

Locking Bit. More importantly, the user must be sure

that the password is correct when the Password Mode

Locking Bit is set. Due to the fact that read operations

are disabled, there is no means to verify what the

password is afterwards. If the password is lost after

setting the Password Mode Locking Bit, there will be

no way to clear the PPB Lock bit.

The Password Mode Locking Bit, once set, prevents

reading the 64-bit password on the DQ bus and further

password programming. The Password Mode Locking

Bit is not erasable. Once Password Mode Locking Bit

is programmed, the Persistent Sector Protection Lock-

ing Bit is disabled from programming, guaranteeing

that no changes to the protection scheme are allowed.

64-bit Password

The 64-bit Password is located in its own memory

space and is accessible through the use of the Pass-

word Program and Verify commands (see Password

Verify Command). The password function works in

conjunction with the Password Mode Locking Bit,

which when set, prevents the Password Verify com-

mand from reading the contents of the password on

the pins of the device.

Write Protect (WP#)

The device features a hardware protection option

using a write protect pin that prevents programming or

erasing, regardless of the state of the sector’s Persis-

tent or Dynamic Protection Bits. The WP# pin is asso-

ciated with the two outermost 8Kbytes sectors in the

75% bank. The WP# pin has no effect on any other

sector. When WP# is taken to V

IL, programming and

erase operations of the two outermost 8 Kbytes sec-

tors in the 75% bank are disabled. By taking WP#

back to V

IH, the two outermost 8 Kbytes sectors are

enabled for program and erase operations, depending

upon the status of the individual sector Persistent or

Dynamic Protection Bits. If either of the two outermost

sectors Persistent or Dynamic Protection Bits are pro-

grammed, program or erase operations are inhibited.

If the sector Persistent or Dynamic Protection Bits are

both erased, the two sectors are available for pro-

gramming or erasing as long as WP# remains at V

IH.

The user must hold the WP# pin at either V

IH or VIL

during the entire program or erase operation of the two

outermost sectors in the 75% bank.

SecSi™ (Secured Silicon) Sector

Protection

The SecSi Sector is a 256-byte flash memory area

that is either programmable at the customer or by

AMD at the request of the customer. The SecSi Sector

Entry command enables the host system to address

the SecSi Sector for programming or reading. The

SecSi sector address range is 00000h–0003Fh for the

top bootblock configuration and 7FFC0h–7FFFFh for

the bottom bootblock configuration. Address range

00 040 h–00 7F F h for t he top b oo t b lo ck a nd

7F800h–7FFBFh return invalid data when addressed

with the SecSi sector enabled.

Un l i ke p r ev i o us fl as h memory d e v i ce s , the

Am29BDD160 allows simultaneous operation while

the SecSi sector is enabled. However, there are a

number of restrictions associated with simultaneous

operation and device operation when the SecSi sector

is enabled:

1. The SecSi sector is not available for reading while

the Password Unlock, any PPB program/erase op-

eration, or Password programming are in progress.

Reading to any location in the small (25%) sector

will return the status of these operations until these

operations have completed execution.

2. Writing the corresponding DYB associated with the

overlaid bootblock sector results in the DYB NOT

being updated. This is only accomplished when the

SecSi sector is not enabled.

3. Reading the corresponding DYB associated with

the overlaid bootblock sector results in reading in-

valid data when the PPB Lock/DYB Verify com-

mand is issued. This function is only accomplished

when the SecSi sector is not enabled.

4. All commands are available for execution when the

SecSi sector is enabled except the following list. Is-

suing the following commands while the SecSi sec-

tor is enabled results in the command being

ignored.

■ All Unlock Bypass commands

■ CFI

■ Accelerated Program

■ Program and Sector Erase Suspend

■ Program and Sector Erase Resume

5. Executing the Sector Erase command is permitted

when the SecSi sector is enabled, however, there is

no provision for erasing the SecSi sector with the

Sector Erase command, regardless of the protec-

tion status. The Sector Erase command will erase

all other sectors when the SecSi sector is enabled.

AM29BDD160G 数据表(PDF) 29 Page - Advanced Micro Devices

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