S29GL01GP
S29GL512P
S29GL256P
S29GL128P
7.9.3
Software Reset
Software reset is part of the command set (see Table on page 65) 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
Reset
(LLD Function = lld_ResetCmd)
Cycle
Operation
Byte Address
Word Address
Data
Reset Command
Write
Base + xxxh
Base + xxxh
00F0h
Note
Base = Base Address.
The following is a C source code example of using the reset function. Refer to the Cypress Low Level Driver User’s Guide (available
on www.cypress.com) for general information on Cypress 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 64 for details].
Document Number: 002-00886 Rev. *B
Page 36 of 83
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