Document Number: 002-00856 Rev. *E
S29JL064J
Figure 10.2
Erase Operation
Notes:
1. See
for erase command sequence.
2. See the section on DQ3 for information on the sector erase timer.
10.8
Erase Suspend/Erase Resume Commands
The Erase Suspend command, B0h, allows the system to interrupt a sector erase operation and then read data from, or program
data to, any sector not selected for erasure. The bank address is required when writing this command. This command is valid only
during the sector erase operation, including the 50 µs time-out period during the sector erase command sequence. The Erase
Suspend command is ignored if written during the chip erase operation or Embedded Program algorithm. The bank address must
contain one of the sectors currently selected for erase.
When the Erase Suspend command is written during the sector erase operation, the device requires a maximum of 35 µs to
suspend the erase operation. However, when the Erase Suspend command is written during the sector erase time-out, the device
immediately terminates the time-out period and suspends the erase operation.
After the erase operation has been suspended, the bank enters the erase-suspend-read mode. The system can read data from or
program data to any sector not selected for erasure. (The device
erase suspends
all sectors selected for erasure.) It is not
recommended to program the Secured Silicon Region after an erase suspend, as proper device functionality cannot be guaranteed.
Reading at any address within erase-suspended sectors produces status information on DQ7–DQ0. The system can use DQ7, or
DQ6 and DQ2 together, to determine if a sector is actively erasing or is erase-suspended. Refer to
for information on these status bits.
After an erase-suspended program operation is complete, the bank returns to the erase-suspend-read mode. The system can
determine the status of the program operation using the DQ7 or DQ6 status bits, just as in the standard Byte Program operation.
Refer to
for more information.
In the erase-suspend-read mode, the system can also issue the autoselect command sequence. The device allows reading
autoselect codes even at addresses within erasing sectors, since the codes are not stored in the memory array. When the device
exits the autoselect mode, the device reverts to the Erase Suspend mode, and is ready for another valid operation. Refer to
for details.
To resume the sector erase operation, the system must write the Erase Resume command. The bank address of the erase-
suspended bank is required when writing this command. Further writes of the Resume command are ignored. Another Erase
Suspend command can be written after the chip has resumed erasing.
START
Write Erase
Command Sequence
(Notes 1, 2)
Data Poll to Erasing
Bank from System
Data = FFh?
No
Yes
Erasure Completed
Embedded
Erase
algorithm
in progress