S29GL01GP datasheet(51/81 Pages) SPANSION

51 / 81 page

October 22, 2012 S29GL-P_00_A14

S29GL-P MirrorBit® Flash Family

Data

She e t

10.2

Customer Lockable Secured Silicon Sector

The Customer Lockable Secured Silicon Sector is always shipped unprotected (DQ7 set to “0”), allowing

customers to utilize that sector in any manner they choose. If the security feature is not required, the Secured

Silicon Sector can be treated as an additional Flash memory space.

Please note the following:

 Once the Secured Silicon Sector area is protected, the Secured Silicon Sector Indicator Bit is permanently

set to “0.”

 The Secured Silicon Sector can be read any number of times, but can be programmed and locked only

once. The Secured Silicon Sector lock must be used with caution as once locked, there is no procedure

available for unlocking the Secured Silicon Sector area and none of the bits in the Secured Silicon Sector

memory space can be modified in any way.

 The accelerated programming (ACC) and unlock bypass functions are not available when the Secured

Silicon Sector is enabled.

 Once the Secured Silicon Sector is locked and verified, the system must write the Exit Secured Silicon

Sector Region command sequence which return the device to the memory array at sector 0.

10.3

Secured Silicon Sector Entry/Exit Command Sequences

The system can access the Secured Silicon Sector region by issuing the three-cycle Enter Secured Silicon

Sector command sequence. The device continues to access the Secured Silicon Sector region until the

system issues the four-cycle Exit Secured Silicon Sector command sequence.

See Command Definitions on page 68 [Secured Silicon Sector Command Table, Appendix

Table 12.1 on page 69 through Table 12.4 on page 72 for address and data requirements for both command

sequences.

The Secured Silicon Sector Entry Command allows the following commands to be executed

 Read customer and factory Secured Silicon areas

 Program the customer Secured Silicon Sector

After the system has written the Enter Secured Silicon Sector command sequence, it may read the Secured

Silicon Sector by using the addresses normally occupied by sector SA0 within the memory array. This mode

of operation continues until the system issues the Exit Secured Silicon Sector command sequence, or until

power is removed from the device.

Software Functions and Sample Code

The following are C functions and source code examples of using the Secured Silicon Sector Entry, Program,

and exit commands. Refer to the Spansion Low Level Driver User’s Guide (available soon on

www.spansion.com) for general information on Spansion Flash memory software development guidelines.

Note

Base = Base Address.

/* Example: SecSi Sector Entry Command */

*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;

/* write unlock cycle 1

*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;

/* write unlock cycle 2

*( (UINT16 *)base_addr + 0x555 ) = 0x0088;

/* write Secsi Sector Entry Cmd

Table 10.2 Secured Silicon Sector Entry

(LLD Function = lld_SecSiSectorEntryCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

Base + AAAh

Base + 555h

00AAh

Unlock Cycle 2

Write

Base + 555h

Base + 2AAh

0055h

Entry Cycle

Write

Base + AAAh

Base + 555h

0088h

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