29PL256N datasheet(43/74 Pages) SPANSION

43 / 74 page

June 6, 2007 S29PL-N_00_A5

S29PL-N MirrorBit

™ Flash Family

Da ta

Shee t

(Prelim i nar y )

7.8

Software Reset

Software reset is part of the command set (see Table 12.1 on page 66) that also returns the device to array

read mode and must be used for the following conditions:

1. To exit Autoselect mode

2. To reset software when DQ5 goes high during write status operation that indicates program or

erase cycle was not successfully completed

3. To exit sector lock/unlock operation.

4. To return to erase-suspend-read mode if the device was previously in Erase Suspend mode.

5. To reset software after any aborted operations

Software Functions and Sample Code

Note

Base = Base Address.

The following is a C source code example of using the reset 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: Reset (software reset of Flash state machine) */

*( (UINT16 *)base_addr + 0x000 ) = 0x00F0;

The following are additional points to consider when using the reset command:

This command resets the banks to the read and address bits are ignored.

Reset commands are ignored once erasure has begun until the operation is complete.

Once programming begins, the device ignores reset commands until the operation is complete

The reset command may be written between the cycles in a program command sequence before

programming begins (prior to the third cycle). This resets the bank to which the system was writing to the

read mode.

If the program command sequence is written to a bank that is in the Erase Suspend mode, writing the reset

command returns that bank to the erase-suspend-read mode.

The reset command may be also written during an Autoselect command sequence.

If a bank has entered the Autoselect mode while in the Erase Suspend mode, writing the reset command

returns that bank to the erase-suspend-read mode.

If DQ1 goes high during a Write Buffer Programming operation, the system must write the Write to Buffer

Abort Reset command sequence to RESET the device to reading array data. The standard RESET

command does not work during this condition.

To exit the unlock bypass mode, the system must issue a two-cycle unlock bypass reset command

sequence (see command tables for detail).

Table 7.19 Reset

(LLD Function = lld_ResetCmd)

Cycle

Operation

Word Address

Data

Reset Command

Write

Base + xxxh

00F0h

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