Document Number: 001-98285 Rev. *R
Page 29 of 108
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
5.4.4.2
Sector Erase
The sector erase function erases one sector in the memory array. The device does not require the system to preprogram prior to
erase. The Embedded Erase algorithm automatically programs and verifies the entire sector for an all 0 data pattern prior to
electrical erase. After a successful sector erase, all locations within the erased sector contain FFFFh. The system is not required to
provide any controls or timings during these operations. The sector erase command sequence is initiated by writing two unlock
cycles, followed by a set up command. Two additional unlock write cycles are then followed by the address of the sector to be
erased, and the sector erase command. When WE# goes high, at the end of the 6th cycle, the RY/BY# goes low.
The system can determine the status of the erase operation by reading the Status Register or using Data Polling. Refer to
for information on these status bits. Refer to
Data Polling Status on page 35
for more information.
Once the sector erase operation has begun, the Status Register Read and Erase Suspend commands are valid. All other
commands are ignored. However, note that a hardware reset immediately terminates the erase operation and returns to read mode
after t
RPH
time. If a sector erase operation is terminated, the sector erase command sequence must be reinitiated once the device
has reset operation to ensure data integrity.
See
Embedded Algorithm Controller (EAC) on page 20
for parameters and timing diagrams.
Sectors protected by the ASP DYB and PPB lock bits will not be erased. See
Figure 5.4
Sector Erase Operation
Write Unlock Cycles:
Address 555h, Data AAh
Address 2AAh, Data 55h
Write Sector Erase Cycles:
Address 555h, Data 80h
Address 555h, Data AAh
Address 2AAh, Data 55h
Sector Address, Data 30h
FAIL. Write reset command
to return to reading array.
PASS. Device returns
to reading array.
Perform Write Operation
Status Algorithm
Unlock Cycle 1
Unlock Cycle 2
Yes
Yes
No
No
Done?
Erase Error?
Command Cycle 1
Command Cycle 2
Command Cycle 3
Specify first sector for erasure
Error condition (Exceeded Timing Limits)
Status may be obtained by Status Register Polling
or Data Polling methods.
