Infineon Cypress S29GL01GS, Manual

Page: 34 / 109

Document Number: 001-98285 Rev. *R Page 33 of 108
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
5.4.6.8 DYB ASO
The system can access the DYB ASO by issuing the DYB entry command sequence during Read Mode. This entry command does
not use a sector address from the entry command. The DYB bit for a sector appears in bit 0 of all word locations in the sector.
The DYB ASO allows the following activities:
 Read DYB protection status of a sector in bit 0 of any word in the sector.
 Set the DYB bit using a modified Word Programming command.
 Clear the DYB bit using a modified Word Programming command.
 ASO Exit using legacy Command Set Exit command for backward software compatibility.
 ASO Exit using the common exit command for all ASO - alternative for a consistent exit method.
5.4.6.9 Software (Command) Reset / ASO exit
Software reset is part of the command set (See Table 7.1 on page 55 ) that also returns the EAC to standby state and must be used
for the following conditions:
 Exit ID/CFI mode
 Clear timeout bit (DQ5) for data polling when timeout occurs
Software Reset does not affect EA mode. Reset commands are ignored once programming or erasure has begun, until the
operation is complete. Software Reset does not affect outputs; it serves primarily to return to Read Mode from an ASO mode or from
a failed program or erase operation.
Software Reset may cause a return to Read Mode from undefined states that might result from invalid command sequences.
However, a Hardware Reset may be required to return to normal operation from some undefined states.
There is no software reset latency requirement. The reset command is executed during the t
WPH
period.
5.4.6.10 ECC Status ASO
The system can access the ECC Status ASO by issuing the ECC Status entry command sequence during Read Mode. The contents
of the ECC Status ASO indicates, for the selected ECC page, whether ECC protection has corrected an error in the eight-bit error
correction code or the 16 Words of data in the ECC page.
The ECC Status ASO allows the following activities:
 Read ECC Status for the selected page.