AM29BDD160G datasheet(27/80 Pages) AMD

27 / 80 page

Am29BDD160G

The Password Mode Locking Bit, once set, prevents

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

ther password programming. The Password Mode

Locking Bit is not erasable. Once Password Mode

Locking Bit is programmed, the Persistent Sector

Protection Locking 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 op-

tion using a write protect pin that prevents

programming or erasing, regardless of the

state of the sector’s Persistent or Dynamic Pro-

tection Bits. The WP# pin is associated 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 sectors 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 Pro-

tection Bits. If either of the two outermost

sectors Persistent or Dynamic Protection Bits

are programmed, program or erase operations

are inhibited. If the sector Persistent or Dy-

namic Protection Bits are both erased, the two

sectors are available for programming or eras-

ing 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 Sec-

tor Entry command enables the host system to

address the SecSi Sector for programming or read-

ing. The SecSi sector address range is 00000h–

0003Fh for the top boot block configuration and

7FFC0h–7FFFFh for the bottom boot block configura-

tion. Address range 00 040 h–00 7F F h for t he top

boot block and 7F800h–7FFBFh return invalid data

when addressed with the SecSi sector enabled.

Unlike previous fl a sh memor y device s , th e

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 sec-

tor is enabled:

■

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 oper-

ations until these operations have completed exe-

cution.

■

Writing the corresponding DYB associated with the

overlaid boot block sector results in the DYB NOT

being updated. This is only accomplished when the

SecSi sector is not enabled.

■

Reading the corresponding DYB associated with

the overlaid boot block 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.

■

All commands are available for execution when

the SecSi sector is enabled except the following

list. Issuing the following commands while the

SecSi sector 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

■

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 pro-

tection status. The Sector Erase command will

erase all other sectors when the SecSi sector is

enabled.

■

Executing the Chip Erase command is permitted

when the SecSi sector is enabled. The Chip Erase

command erases all sectors in the memory array

except for sector 0 in top-boot block configuration

and sector 45 in bottom-boot block configuration.

The SecSi Sector is a one-time programmable

memory area that cannot be erased.

■

Executing the SecSi Sector Entry command during

program or erase suspend mode is allowed. The

Sector Erase/Program Resume command is dis-

abled while the SecSi sector is enabled, and the

user cannot resume programming of the memory

array until the Exit SecSi Sector command is writ-

ten.

SecSi Sector Protection Bit

The SecSi Sector Protection Bit prevents program-

ming of the SecSi sector memory area. Once set, the

SecSi sector memory area contents are non-modifi-

able.

AM29BDD160G Datasheet(PDF) 27 Page - Advanced Micro Devices

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