Document Number: 001-98285 Rev. *R
Page 40 of 108
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
5.6
Error Types and Clearing Procedures
There are three types of errors reported by the embedded operation status methods. Depending on the error type, the status
reported and procedure for clearing the error status is different. Following is the clearing of error status:
If an ASO was entered before the error the device remains entered in the ASO awaiting ASO read or a command write.
If an erase was suspended before the error the device returns to the erase suspended state awaiting flash array read or a
command write.
Otherwise, the device will be in standby state awaiting flash array read or a command write.
5.6.1
Embedded Operation Error
If an error occurs during an embedded operation (program, erase, blank check, or password unlock) the device (EAC) remains busy.
The RY/BY# output remains Low, data polling status continues to be overlaid on all address locations, and the status register shows
ready with valid status bits. The device remains busy until the error status is detected by the host system status monitoring and the
error status is cleared.
During embedded algorithm error status the Data Polling status will show the following:
DQ7 is the inversion of the DQ7 bit in the last word loaded into the write buffer or last word of the password in the case of
the password unlock command. DQ7 = 0 for an erase or blank check failure
DQ6 continues to toggle
DQ5 = 1; Failure of the embedded operation
DQ4 is RFU and should be treated as don’t care (masked)
DQ3 = 1 to indicate embedded sector erase in progress
DQ2 continues to toggle, independent of the address used to read status
DQ1 = 0; Write buffer abort error
DQ0 is RFU and should be treated as don’t care (masked)
During embedded algorithm error status the Status Register will show the following:
SR[7] = 1; Valid status displayed
SR[6] = X; May or may not be erase suspended during the EA error
SR[5] = 1 on erase or blank check error; else = 0
SR[4] = 1 on program or password unlock error; else = 0
SR[3] = 0; Write buffer abort
SR[2] = 0; Program suspended
SR[1] = 0; Protected sector
SR[0] = X; RFU, treat as don’t care (masked)
When the embedded algorithm error status is detected, it is necessary to clear the error status in order to return to normal operation,
with RY/BY# High, ready for a new read or command write. The error status can be cleared by writing:
Reset command
Status Register Clear command
Commands that are accepted during embedded algorithm error status are:
Status Register Read
Reset command
Status Register Clear command
