AM29BDD160G datasheet(43/79 Pages) AMD

43 / 79 page

June 7, 2006

Am29BDD160G

SecSi Sector Entry Command

The SecSi Sector Entry command enables the SecSi

(OTP) sector to overlay the 8 KB outermost sector in

the small (25%) bank. The SecSi sector overlays

00000h–0003Fh for the top bootblock configuration

and 7FFC0h–7FFFFh for the bottom bootblock confiu-

ration. Address range 00040h–007FFh for the top

bootblock and 7F800h–7FFBFh return invalid data

when addressed with the SecSi sector enabled. The

following commands are permitted after issuing the

SecSi Sector Entry command:

1. Autoselect

2. Password Program (x16 and x32)

3. Password Verify

4. Password Unlock (x16 and x32)

5. Read/Reset

6. Program

7. Chip and Sector Erase

8. SecSi Sector Protection Bit Program

9. PPB Program

10.All PPB Erase

11. PPB Lock Bit Set

12.DYB Write

13.DYB/PPB/PPB Lock Bit Verify

14.Security Reset

15.Configuration Register Write

16.Configuration Register Read

The following commands are unavailable when the

SecSi sector is enabled. Issuing the following com-

mands while the SecSi sector is enabled results in the

command being ignored.

1. Unlock Bypass

2. CFI

3. Accelerated Program

4. Program and Sector Erase Suspend

5. Program and Sector Erase Resume

The SecSi Sector Entry command is allowed when the

device is in either program or erase suspend modes. If

the SecSi sector is enabled, the program or erase sus-

pend command is ignored. This prevents resuming ei-

ther programming or erasure on the SecSi sector if the

overlayed sector was undergoing programming or era-

sure. The host system must ensure that the device

resume any suspended program or erase opera-

tion after exiting the SecSi sector.

Executing any of the PPB program/erase commands,

or Password Unlock command results in the small

bank (25% bank) returning the status of these opera-

tions while they are in progress, thus making the

SecSi sector unavailable for reading. If the SecSi sec-

tor is enabled while the DYB command is issued, the

DYB for the overlayed sector is NOT updated. Read-

ing the DYB status using the PPB Lock Bit/DYBDYB

verify command when the SecSi sector is enabled re-

turns invalid data.

Password Program Command

The Password Program Command permits program-

ming the password that is used as part of the hard-

ware protection scheme. The actual password is

64-bits long. Depending upon the state of the WORD#

pin, multiple Password Program Commands are re-

quired. For a x16 bit data bus, 4 Password Program

commands are required to program the password. For

a x32 bit data bus, 2 Password Program commands

are required. The user must enter the unlock cycle,

password program command (38h) and the program

address/data for each portion of the password when

programming. There are no provisions for entering the

2-cycle unlock cycle, the password program com-

mand, and all the password data. There is no special

addressing order required for programming the pass-

word. Also, when the password is undergoing pro-

gramming, Simultaneous Operation is disabled. Read

operations to any memory location will return the pro-

gramming status. Once programming is complete, the

user must issue a Read/Reset command to return the

device to normal operation. Once the Password is

written and verified, the Password Mode Locking Bit

must be set in order to prevent verification. The Pass-

word Program Command is only capable of program-

m i ng “ 0 ” s. P r ogr a mm i ng a “1” a ft er a cell is

programmed as a “0” results in a time-out by the Em-

bedded Program Algorithm™ with the cell remaining

as a “0”. The password is all F’s when shipped from

the factory. All 64-bit password combinations are valid

as a password.

Password Programming is permitted if the SecSi sec-

tor is enabled.

Password Verify Command

The Password Verify Command is used to verify the

Password. The Password is verifiable only when the

Password Mode Locking Bit is not programmed. If the

Password Mode Locking Bit is programmed and the

user attempts to verify the Password, the device will

always drive all F’s onto the DQ data bus.

The Password Verify command is permitted if the

SecSi sector is enabled. Also, the device will not oper-

ate in Simultaneous Operation when the Password

Verify command is executed. Only the password is re-

turned regardless of the bank address. The lower two

address bits (A0:A-1) are valid during the Password

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