S29CD032G datasheet(57/93 Pages) SPANSION

57 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

cannot be erased! If the Password Protection Mode Locking Bit is verified as pro-

gram without margin, the Password Protection Mode Locking Bit Program

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.

The Password Protection Mode Locking Bit Program command is permitted if the

SecSi sector is enabled.

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.

The Persistent Sector Protection Mode Locking Bit Program command is permitted

if the SecSi sector is enabled.

SecSi Sector Protection Bit Program Command

The SecSi Sector Protection Bit Program Command programs the SecSi Sector

Protection Bit, which prevents the SecSi sector memory from being cleared. If the

SecSi Sector Protection Bit is verified as programmed without margin, the SecSi

Sector Protection Bit Program Command should be reissued to improve program

margin. Exiting the VCC-level SecSi Sector Protection Bit Program Command is

accomplished by writing the Read/Reset command.

The SecSi Sector Protection Bit Program command is permitted if the SecSi sector

is enabled.

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.

The PPB Lock Bit Set command is permitted if the SecSi sector is enabled.

DYB Write Command

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

order address bits (A19–A11) 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

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