S75WS256NDFBAWMA datasheet(66/216 Pages) SPANSION

66 / 216 page

S75WS256Nxx Based MCPs

S75WS-N-00_A0 February 17, 2005

Ad van c e

Inf o rmation

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.amd.com and www.fujitsu.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

Note: Base = Base Address.

/* Once in the SecSi Sector mode, you program */

/* words using the programming algorithm.

Note: Base = Base Address.

/* Example: SecSi Sector Exit Command */

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

/* write unlock cycle 1

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

/* write unlock cycle 2

*( (UINT16 *)base_addr + 0x555 ) = 0x0090;

/* write SecSi Sector Exit cycle 3 */

*( (UINT16 *)base_addr + 0x000 ) = 0x0000;

/* write SecSi Sector Exit cycle 4 */

Software Functions and Sample Code

Table 11.2 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 + 554h

Base + 2AAh

0055h

Entry Cycle

Write

Base + AAAh

Base + 555h

0088h

Table 11.3 Secured Silicon Sector Program

(LLD Function = lld_ProgramCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

Base + AAAh

Base + 555h

00AAh

Unlock Cycle 2

Write

Base + 554h

Base + 2AAh

0055h

Program Setup

Write

Base + AAAh

Base + 555h

00A0h

Program

Write

Word Address

Data Word

Table 11.4 Secured Silicon Sector Exit

(LLD Function = lld_SecSiSectorExitCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

Base + AAAh

Base + 555h

00AAh

Unlock Cycle 2

Write

Base + 554h

Base + 2AAh

0055h

Exit Cycle

Write

Base + AAAh

Base + 555h

0090h

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