S29GL01GP datasheet(26/81 Pages) SPANSION

26 / 81 page

S29GL-P MirrorBit® Flash Family

S29GL-P_00_A14 October 22, 2012

Da ta

Sh e e t

Software Functions and Sample Code

Note

Base = Base Address.

The following is a C source code example of using the single word program function. Refer to the Spansion

Low Level Driver User’s Guide (available on www.spansion.com) for general information on Spansion Flash

memory software development guidelines.

/* Example: Program Command

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

/* write unlock cycle 1

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

/* write unlock cycle 2

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

/* write program setup command

*( (UINT16 *)pa )

= data;

/* write data to be programmed

/* Poll for program completion */

7.7.2

Write Buffer Programming

Write Buffer Programming allows the system to write a maximum of 32 words in one programming operation.

This results in a faster effective word programming time than the standard “word” programming algorithms.

The Write Buffer Programming command sequence is initiated by first writing two unlock cycles. This is

followed by a third write cycle containing the Write Buffer Load command written at the Sector Address in

which programming occurs. At this point, the system writes the number of “word locations minus 1” that are

loaded into the page buffer at the Sector Address in which programming occurs. This tells the device how

many write buffer addresses are loaded with data and therefore when to expect the “Program Buffer to Flash”

confirm command. The number of locations to program cannot exceed the size of the write buffer or the

operation aborts. (Number loaded = the number of locations to program minus 1. For example, if the system

programs 6 address locations, then 05h should be written to the device.)

The system then writes the starting address/data combination. This starting address is the first address/data

pair to be programmed, and selects the “write-buffer-page” address. All subsequent address/data pairs must

fall within the elected write-buffer-page.

The “write-buffer-page” is selected by using the addresses AMAX–A5.

The “write-buffer-page” addresses must be the same for all address/data pairs loaded into the write buffer.

(This means Write Buffer Programming cannot be performed across multiple “write-buffer-pages.” This also

means that Write Buffer Programming cannot be performed across multiple sectors. If the system attempts to

load programming data outside of the selected “write-buffer-page”, the operation ABORTs.)

After writing the Starting Address/Data pair, the system then writes the remaining address/data pairs into the

write buffer.

Note that if a Write Buffer address location is loaded multiple times, the “address/data pair” counter is

decremented for every data load operation. Also, the last data loaded at a location before the “Program Buffer

to Flash” confirm command is the data programmed into the device. It is the software's responsibility to

comprehend ramifications of loading a write-buffer location more than once. The counter decrements for each

data load operation, NOT for each unique write-buffer-address location. Once the specified number of write

buffer locations have been loaded, the system must then write the “Program Buffer to Flash” command at the

Sector Address. Any other address/data write combinations abort the Write Buffer Programming operation.

The Write Operation Status bits should be used while monitoring the last address location loaded into the

write buffer. This eliminates the need to store an address in memory because the system can load the last

address location, issue the program confirm command at the last loaded address location, and then check

the write operation status at that same address. DQ7, DQ6, DQ5, DQ2, and DQ1 should be monitored to

determine the device status during Write Buffer Programming.

Table 7.6 Single Word/Byte 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 + 555h

Base + 2AAh

0055h

Program Setup

Write

Base + AAAh

Base + 555h

00A0h

Program

Write

Byte Address

Word Address

Data

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