70 S29GLxxxN MirrorBitTM Flash Family 27631A4 May 13, 2004

Advance Information

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.

May 13, 2004 27631A4 S29GLxxxN MirrorBitTM Flash Family 71

Advance Information

Reads and writes from the main memory are allowed.

 PPB Lock Bit Set Command

The PPB Lock Bit Set command is used to set the PPB Lock Bit to the “freeze state”

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

to the “freeze state”, it cannot be cleared unless the device is taken through a

power-on clear (for Persistent Protection Mode) or the Password Unlock command

is executed (for Password Protection Mode). If the Password Protection Mode Lock

Bit is programmed, the PPB Lock Bit status is reflected as set to the “freeze state”,

even after a power-on reset cycle.

 PPB Lock Bit Status Read Command

The programming state of the PPB Lock Bit can be verified by executing a PPB

Lock Bit Status Read command to the device.

The Global Volatile Sector Protection Freeze Command Set Exit command

must be issued after the execution of the commands listed previously to reset the

device to read mode.

Volatile Sector Protection Command Set

The Volatile Sector Protection Command Set permits the user to set the Dynamic

Protection Bit (DYB) to the “protected state”, clear the Dynamic Protection Bit

(DYB) to the “unprotected state”, and read the logic state of the Dynamic Protec-

tion Bit (DYB).

The Volatile Sector Protection Command Set Entry command sequence

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

command execution.

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

mand disables reads for the bank selected with the command. Reads and

Writes for other banks excluding that bank are allowed.

 DYB Set Command

 DYB Clear Command

The DYB Set and DYB Clear commands are used to protect or unprotect a DYB for

a given sector. The high order address bits are issued at the same time as the

code 00h or 01h on DQ7-DQ0. All other DQ data bus pins are ignored during the

data write cycle. The DYB bits are modifiable at any time, regardless of the state

of the PPB bit or PPB Lock Bit. The DYB bits are cleared to the “unprotected state”

at power-up or hardware reset.

—DYB Status Read Command

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

a DYB Status Read command to the device. This requires an initial access delay.

The 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 Volatile Sector Protection Command Set Exit com-

mand re-enables reads and writes to the main memory.

SecSi Sector Entry Command

The SecSi Sector Entry command allows the following commands to be executed

 Read from SecSi Sector

72 S29GLxxxN MirrorBitTM Flash Family 27631A4 May 13, 2004

Advance Information

 Program to SecSi Sector

Once the SecSi Sector Entry Command is issued, the SecSi Sector Exit command

has to be issued to exit SecSi Sector Mode.

SecSi Sector Exit Command

The SecSi Sector Exit command may be issued to exit the SecSi Sector Mode.

Part #	S29GL256N10TFI020
Description	NOR Flash Parallel 3.3V 256M-bit 32M x 8/16M x 16 100ns 56
Category	IC
Availability	In Stock
Qty	2

S29GL256N10TFI020

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