AM29BDD160G datasheet(45/79 Pages) AMD

45 / 79 page

June 7, 2006

Am29BDD160G

lected (WORD# = 0). Writing the Password Unlock

command is address order specific. In other words, for

the x32 data bus configuration, the lower 32 bits of the

password are written first and then the upper 32 bits of

the password are written. For the x16 data bus config-

uration, the lower address A0:A

-1= 00, the next Pass-

word Unlock command is to A0:A

-1 = 01, then to

A0:A

-1= 10, and finally to A0:A-1= 11. Writing out of se-

quence results in the Password Unlock not returning a

match with the password and the PPB Lock Bit re-

mains set.

Once the Password Unlock command is entered, the

RDY/BSY# pin goes LOW indicating that the device is

busy. Also, reading the small bank (25% bank) results

in the DQ6 pin toggling, indicating that the Password

Unlock function is in progress. Reading the large bank

(75% bank) returns actual array data. Approximately

1uSec is required for each portion of the unlock. Once

the first portion of the password unlock completes

(RDY/BSY# is not driven and DQ6 does not toggle

when read), the Password Unlock command is issued

again, only this time with the next part of the pass-

word. If WORD# = 1, the second Password Unlock

command is the final command before the PPB Lock

Bit is cleared (assuming a valid password). If WORD#

= 0, this is the fourth Password Unlock command. In

x16 mode, four Password Unlock commands are re-

quired to successfully clear the PPB Lock Bit. As with

the first Password Unlock command, the RY/BY# sig-

nal goes LOW and reading the device results in the

DQ6 pin toggling on successive read operations until

complete. It is the responsibility of the microprocessor

to keep track of the number of Password Unlock com-

mands (2 for x32 bus and 4 for x16 bus), the order,

and when to read the PPB Lock bit to confirm suc-

cessful password unlock

The Password Unlock command is permitted if the

SecSi sector is enabled.

PPB Program Command

The PPB Program command is used to program, or

set, a given PPB. Each PPB is individually pro-

grammed (but is bulk erased with the other PPBs).

The specific sector address (A18–A11) are written at

the same time as the program command 60h with A6

= 0. If the PPB Lock Bit is set and the corresponding

PPB is set for the sector, the PPB Program command

will not execute and the command will time-out without

programming the PPB.

The host system must determine whether a PPB has

been fully programmed by noting the status of DQ0 in

the sixth cycle of the PPB Program command. If DQ0

= 0, the entire six-cycle PPB Program command se-

quence must be reissued until DQ0 = 1.

All PPB Erase Command

The All PPB Erase command is used to erase all

PPBs in bulk. There is no means for individually eras-

ing a specific PPB. Unlike the PPB program, no spe-

cific sector address is required. However, when the

PPB erase command is written (60h) and A6 = 1, all

Sector PPBs are erased in parallel. If the PPB Lock Bit

is set the ALL PPB Erase command will not execute

and the command will time-out without erasing the

PPBs. The host system must determine whether all

PPB has been fully erased by noting the status of DQ0

in the sixth cycle of the All PPB Erase command. If

DQ0 = 1, the entire six-cycle All PPB Erase command

sequence must be reissued until DQ0 = 1.

It is the responsibility of the user to preprogram all

PPBs prior to issuing the All PPB Erase command. If

the user attempts to erase a cleared PPB, over-era-

sure may occur making it difficult to program the PPB

at a later time. Also note that the total number of PPB

program/erase cycles is limited to 100 cycles. Cycling

the PPBs beyond 100 cycles is not guaranteed.

The All PPB Erase command is permitted if the SecSi

sector is enabled.

DYB Write

The DYB Write command is used for setting the DYB,

which is a volatile bit that is cleared at reset. There is

one DYB per sector. If the PPB is set, the sector is

protected regardless of the value of the DYB. If the

PPB is cleared, setting the DYB to a 1 protects the

sector from programs or erases. Since this is a volatile

bit, removing power or resetting the device will clear

the DYBs. The bank address is latched when the com-

mand is written.

The DYB Write command is permitted if the SecSi

sector is enabled.

PPB Lock Bit Set

The PPB Lock Bit set command is used for setting the

DYB, which is a volatile bit that is cleared at reset.

There is one DYB per sector. If the PPB is set, the

sector is protected regardless of the value of the DYB.

If the PPB is cleared, setting the DYB to a 1 protects

the sector from programs or erases. Since this is a vol-

atile bit, removing power or resetting the device will

clear the DYBs. The bank address is latched when the

command is written.

The PPB Lock command is permitted if the SecSi sec-

tor is enabled.

DYB Status

The programming of the DYB for a given sector can be

verified by writing a DYB status verify command to the

device.

AM29BDD160G 数据表(PDF) 45 Page - Advanced Micro Devices

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