S29CD032G datasheet(59/93 Pages) SPANSION

59 / 93 page

March 22, 2004 30606B0

S29CD032G

Ad va nc e

In forma t i o n

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 (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 com-

mand. 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-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.

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 command 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 volatile

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 sector 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.

PPB Status

The programming of the PPB for a given sector can be verified by writing a PPB

status verify command to the device.

PPB Lock Bit Status

The programming of the PPB Lock Bit for a given sector can be verified by writing

a PPB Lock Bit status verify command to the device.

Non-volatile Protection Bit Program And Erase Flow

The device uses a standard command sequence for programming or erasing the

SecSi Sector Protection, Password Locking, Persistent Sector Protection Mode

S29CD032G Datasheet(PDF) 59 Page - SPANSION

S29CD032G Datasheet(HTML) 59 Page - SPANSION

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