S29GL032A datasheet(53/95 Pages) SPANSION

53 / 95 page

September 10, 2007 S29GL-A_00_A11

S29GL-A

Data

She e t

9.3

Autoselect Command Sequence

The autoselect command sequence allows the host system to read several identifier codes at specific

addresses:

Note

The device ID is read over three cycles. SA = Sector Address

The autoselect command sequence is initiated by first writing two unlock cycles. This is followed by a third

write cycle that contains the autoselect command. The device then enters the autoselect mode. The system

may read at any address any number of times without initiating another autoselect command sequence:

The system must write the reset command to return to the read mode (or erase-suspend-read mode if the

device was previously in Erase Suspend).

9.4

Enter/Exit Secured Silicon Sector Command Sequence

The Secured Silicon Sector region provides a secured data area containing an 8-word/16-byte random

Electronic Serial Number (ESN). 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.

The Exit Secured Silicon Sector command sequence returns the device to normal operation. Table 10.2

on page 61 and Table 10.1 on page 62 show the address and data requirements for both command

sequences. See also Secured Silicon Sector Flash Memory Region on page 47 for further information. Note

that the ACC function and unlock bypass modes are not available when the Secured Silicon Sector is

enabled.

9.4.1

Word Program Command Sequence

Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two

unlock write cycles, followed by the program set-up command. The program address and data are written

next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further

controls or timings. The device automatically provides internally generated program pulses and verifies the

programmed cell margin. Table 10.2 on page 61 and Table 10.1 on page 62 show the address and data

requirements for the word program command sequence, respectively.

When the Embedded Program algorithm is complete, the device then returns to the read mode and

addresses are no longer latched. The system can determine the status of the program operation by using

DQ7 or DQ6. Refer to Write Operation Status on page 63 for information on these status bits. Any commands

written to the device during the Embedded Program Algorithm are ignored. Note that the Secured Silicon

Sector, autoselect, and CFI functions are unavailable when a program operation is in progress. Note that a

hardware reset immediately terminates the program operation. The program command sequence should be

reinitiated once the device returns to the read mode, to ensure data integrity.

Programming is allowed in any sequence of address locations and across sector boundaries. Programming

to the same word address multiple times without intervening erases (incremental bit programming) requires a

modified programming method. For such application requirements, please contact your local Spansion

representative. Word programming is supported for backward compatibility with existing Flash driver software

and for occasional writing of individual words. Use of write buffer programming (see below) is strongly

recommended for general programming use when more than a few words are to be programmed. The

effective word programming time using write buffer programming is approximately four times shorter than the

single word programming time.

Identifier Code

A7:A0 (x16)

A6:A-1 (x8)

Manufacturer ID

00h

Device ID, Cycle 1

01h

02h

Device ID, Cycle 2

0Eh

1Ch

Device ID, Cycle 3

0Fh

1Eh

Secured Silicon Sector Factory Protect

03h

06h

Sector Protect Verify

(SA)02h

(SA)04h

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