S71PL129JC0 datasheet(53/149 Pages) SPANSION

53 / 149 page

June 4, 2004 S29PL129J_MCP_00_A0

S29PL129J for MCP

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Informatio n

to correctly match a password. If the command is issued before the 2 µs execu-

tion window for each portion of the unlock, the command will be ignored.

Once the Password Unlock command is entered, the RY/BY# indicates that the

device is busy. Approximately 1 µs is required for each portion of the unlock. Once

the first portion of the password unlock completes (RY/BY# is not low or DQ6

does not toggle when read), the next part of the password is written. The system

must thus monitor RY/BY# or the status bits to confirm when to write the next

portion of the password. Seven cycles are required to successfully clear the PPB

Lock Bit.

PPB Program Command

The PPB Program command is used to program, or set, a given PPB. Each PPB is

individually programmed (but is bulk erased with the other PPBs). The specific

sector address (A22–A12) 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.

After programming a PPB, two additional cycles are needed to determine whether

the PPB has been programmed with margin. If the PPB has been programmed

without margin, the program command should be reissued to improve the pro-

gram margin. 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 PPB Program command does not follow the Embedded Program algorithm.

All PPB Erase Command

The All PPB Erase command is used to erase all PPBs in bulk. There is no means

for individually erasing a specific PPB. Unlike the PPB program, no specific sector

address is required. However, when the PPB erase command is written 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. After

erasing the PPBs, two additional cycles are needed to determine whether the PPB

has been erased with margin. If the PPBs has been erased without margin, the

erase command should be reissued to improve the program margin.

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-erasure

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.

DYB Write Command

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 command is written.

PPB Lock Bit Set Command

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

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