S71PL129JC0 datasheet(52/149 Pages) SPANSION

52 / 149 page

S29PL129J for MCP

S29PL129J_MCP_00_A0 June 4, 2004

Advance

Info rmation

command can be executed to improve the program margin. Once the Password

Protection Mode Locking Bit is programmed, the Persistent Sector Protection

Locking Bit program circuitry is disabled, thereby forcing the device to remain in

the Password Protection mode. Exiting the Mode Locking Bit Program command

is accomplished by writing the Read/Reset command.

Persistent Sector Protection Mode Locking Bit Program Command

The Persistent Sector Protection Mode Locking Bit Program Command programs

the Persistent Sector Protection Mode Locking Bit, which prevents the Password

Mode Locking Bit from ever being programmed. If the Persistent Sector Protec-

tion Mode Locking Bit is verified as programmed without margin, the Persistent

Sector Protection Mode Locking Bit Program Command should be reissued to im-

prove program margin. By disabling the program circuitry of the Password Mode

Locking Bit, the device is forced to remain in the Persistent Sector Protection

mode of operation, once this bit is set. Exiting the Persistent Protection Mode

Locking Bit Program command is accomplished by writing the Read/Reset

command.

Secured Silicon Sector Protection Bit Program Command

The Secured Silicon Sector Protection Bit Program Command programs the Se-

cured Silicon Sector Protection Bit, which prevents the Secured Silicon sector

memory from being cleared. If the Secured Silicon Sector Protection Bit is verified

as programmed without margin, the Secured Silicon Sector Protection Bit Pro-

gram Command should be reissued to improve program margin. Exiting the VCC-

level Secured Silicon Sector Protection Bit Program Command is accomplished by

writing the Read/Reset command.

PPB Lock Bit Set Command

The PPB Lock Bit Set command is used to set the PPB Lock bit if it is cleared either

at reset or if the Password Unlock command was successfully executed. There is

no PPB Lock Bit Clear command. Once the PPB Lock Bit is set, it cannot be cleared

unless the device is taken through a power-on clear or the Password Unlock com-

mand is executed. Upon setting the PPB Lock Bit, the PPBs are latched into the

DYBs. If the Password Mode Locking Bit is set, the PPB Lock Bit status is reflected

as set, even after a power-on reset cycle. Exiting the PPB Lock Bit Set command

is accomplished by writing the Read/Reset command (only in the Persistent Pro-

tection Mode).

DYB Write Command

The DYB Write command is used to set or clear a DYB for a given sector. The high

order address bits (Amax–A12) are issued at the same time as the code 01h or

00h on DQ7-DQ0. All other DQ data bus pins are ignored during the data write

cycle. The DYBs are modifiable at any time, regardless of the state of the PPB or

PPB Lock Bit. The DYBs are cleared at power-up or hardware reset.Exiting the

DYB Write command is accomplished by writing the Read/Reset command.

Password Unlock Command

The Password Unlock command is used to clear the PPB Lock Bit so that the PPBs

can be unlocked for modification, thereby allowing the PPBs to become accessible

for modification. The exact password must be entered in order for the unlocking

function to occur. This command cannot be issued any faster than 2 µs at a time

to prevent a hacker from running through all 64-bit combinations in an attempt

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