s29jl064j Meet Spansion Inc., s29jl064j Datasheet - Page 35

• Manufacturer Part Number: s29jl064j
• Description: 64 Megabit 8m X 8-bit/4m X 16-bit Cmos 3.0 Volt-only, Simultaneous Read/write Flash Memory
• Manufacturer: Meet Spansion Inc.

10.8
April 7, 2011 S29JL064J_00_03
Erase Suspend/Erase Resume Commands
Notes:
1. See
2. See the section on DQ3 for information on the sector erase timer.
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 80 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
on page 37
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
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
Command Sequence on page 32
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.
Table 10.1 on page 36
for information on these status bits.
for erase command sequence.
D a t a
for details.
S h e e t
No
Figure 10.2 Erase Operation
S29JL064J
Command Sequence
Data Poll to Erasing
Erasure Completed
Bank from System
Write Erase
(Notes 1, 2)
Data = FFh?
Write Operation Status on page 37
START
Yes
Autoselect Mode on page 21
Embedded
Erase
algorithm
in progress
for more information.
Write Operation Status
and
Autoselect
35