S29GL01GP datasheet(41/81 Pages) SPANSION

41 / 81 page

October 22, 2012 S29GL-P_00_A14

S29GL-P MirrorBit® Flash Family

Data

She e t

7.9.3

Software Reset

Software reset is part of the command set (see Table 12.1 on page 69) that also returns the device to array

read mode and must be used for the following conditions:

1. to exit Autoselect mode

2. when DQ5 goes high during write status operation that indicates program or erase cycle was not

successfully completed

3. exit sector lock/unlock operation.

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

5. 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 ) = 0x00F0;

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

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

 Reset commands are ignored during program and erase operations.

 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 sector to which the system was writing to the

read mode.

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

reset command returns that sector to the erase-suspend-read mode.

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

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

returns that sector 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 Definitions on page 68 for details].

Table 7.18 Reset

(LLD Function = lld_ResetCmd)

Cycle

Operation

Byte Address

Word Address

Data

Reset Command

Write

Base + xxxh

00F0h

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