S75WS256NDFBAWMB datasheet(46/216 Pages) SPANSION

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S75WS256Nxx Based MCPs

S75WS-N-00_A0 February 17, 2005

Ad van c e

Inf o rmation

The following are C source code examples of using the unlock bypass entry, program, and exit

functions. 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.

/* Example: Unlock Bypass Entry Command

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

/* write unlock cycle 1

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

/* write unlock cycle 2

*( (UINT16 *)bank_addr + 0x555 ) = 0x0020;

/* write unlock bypass command

/* At this point, programming only takes two write cycles.

/* Once you enter Unlock Bypass Mode, do a series of like

/* operations (programming or sector erase) and then exit

/* Unlock Bypass Mode before beginning a different type of

/* operations.

/* Example: Unlock Bypass Program Command

/* Do while in Unlock Bypass Entry Mode!

*( (UINT16 *)bank_addr + 0x555 ) = 0x00A0;

/* write program setup command

*( (UINT16 *)pa )

= data;

/* write data to be programmed

/* Poll until done or error.

/* If done and more to program, */

/* do above two cycles again.

/* Example: Unlock Bypass Exit Command */

*( (UINT16 *)base_addr + 0x000 ) = 0x0090;

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

8.5.9

Write Operation Status

The device provides several bits to determine the status of a program or erase operation. The

following subsections describe the function of DQ1, DQ2, DQ3, DQ5, DQ6, and DQ7.

DQ7: Data# Polling.

The Data# Polling bit, DQ7, indicates to the host system whether an Em-

bedded Program or Erase algorithm is in progress or completed, or whether a bank is in Erase

Suspend. Data# Polling is valid after the rising edge of the final WE# pulse in the command se-

Software Functions and Sample Code

Table 8.20 Unlock Bypass Entry

(LLD Function = lld_UnlockBypassEntryCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Unlock

Write

Base + AAAh

Base + 555h

00AAh

Unlock

Write

Base + 554h

Base + 2AAh

0055h

Entry Command

Write

Base + AAAh

Base + 555h

0020h

Table 8.21 Unlock Bypass Program

(LLD Function = lld_UnlockBypassProgramCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Program Setup Command

Write

Base + xxxh

Base +xxxh

00A0h

Program Command

Write

Program Address

Program Data

Table 8.22 Unlock Bypass Reset

(LLD Function = lld_UnlockBypassResetCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Reset Cycle 1

Write

Base + xxxh

Base +xxxh

0090h

Reset Cycle 2

Write

Base + xxxh

Base +xxxh

0000h

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