S71GS256 datasheet(77/195 Pages) SPANSION

77 / 195 page

December 15, 2004 S29GLxxxN_MCP_A1

S29GLxxxN MirrorBitTM Flash Family

Ad vance

Info rmat i o n

The Password Protection Command Set Exit command must be issued after

the execution of the commands listed previously to reset the device to read

mode. Otherwise the device will hang.

Note that issuing the Password Protection Command Set Exit command re-

enables reads and writes for the main memory.

Non-Volatile Sector Protection Command Set Definitions

The Non-Volatile Sector Protection Command Set permits the user to program the

Persistent Protection Bits (PPB bits), erase all of the Persistent Protection Bits

(PPB bits), and read the logic state of the Persistent Protection Bits (PPB bits).

The Non-Volatile Sector Protection Command Set Entry command se-

quence must be issued prior to any of the commands listed following to enable

proper command execution.

Note that issuing the Non-Volatile Sector Protection Command Set Entry

command disables reads and writes for the main memory.

PPB Program Command

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

bit is individually programmed (but is bulk erased with the other PPB bits). The

specific sector address (A24-A16 for S29GL512N, A23-A16 for S29GL256N, A22-

A16 for S29GL128N) is written at the same time as the program command. If the

PPB Lock Bit is set to the “freeze state”, the PPB Program command will not exe-

cute and the command will time-out without programming the PPB bit.

All PPB Erase Command

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

means for individually erasing a specific PPB bit. Unlike the PPB program, no spe-

cific sector address is required. However, when the All PPB Erase command is

issued, all Sector PPB bits are erased in parallel. If the PPB Lock Bit is set to

“freeze state”, the ALL PPB Erase command will not execute and the command

will time-out without erasing the PPB bits.

The device will preprogram all PPB bits prior to erasing when issuing the All PPB

Erase command. Also note that the total number of PPB program/erase cycles has

the same endurance as the flash memory array.

PPB Status Read Command

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

PPB Status Read Command to the device. This requires an initial access time

latency.

The Non-Volatile Sector Protection Command Set Exit command must be

issued after the execution of the commands listed previously to reset the device

to read mode.

Note that issuing the Non-Volatile Sector Protection Command Set Exit

command re-enables reads and writes for the main memory.

Global Volatile Sector Protection Freeze Command Set

The Global Volatile Sector Protection Freeze Command Set permits the user to set

the PPB Lock Bit and reading the logic state of the PPB Lock Bit.

The Global Volatile Sector Protection Freeze Command Set Entry com-

mand sequence must be issued prior to any of the commands listed following to

enable proper command execution.

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