s29al008d Meet Spansion Inc., s29al008d Datasheet - Page 25

• Manufacturer Part Number: s29al008d
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

8.8
November 27, 2007 S29AL008D_00_A10
Erase Suspend/Erase Resume Commands
The Erase Suspend command allows the system to interrupt a sector erase operation and then read data
from, or program data to, any sector not selected for erasure. 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.
Writing the Erase Suspend command during the Sector Erase time-out immediately terminates the time-out
period and suspends the erase operation. Addresses are don’t-cares when writing the Erase Suspend
command.
When the Erase Suspend command is written during a sector erase operation, the device requires a
maximum of 20 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 is suspended, the system can read array data from or program data to any sector
not selected for erasure. (The device erase suspends all sectors selected for erasure.) Normal read and write
timings and command definitions apply. Reading at any address within erase-suspended sectors produces
status data 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. See
status bits.
After an erase-suspended program operation is complete, the system can once again read array data within
non-suspended sectors. The system can determine the status of the program operation using the DQ7 or
DQ6 status bits, just as in the standard program operation. See
information.
The system may also write the autoselect command sequence when the device is in the Erase Suspend
mode. 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. See
on page 22
The system must write the Erase Resume command (address bits are don’t care) to exit the erase suspend
mode and continue the sector erase operation. Further writes of the Resume command are ignored. Another
Erase Suspend command can be written after the device resumes erasing.
Notes
1. See
2. See
Table 8.1 on page 26
DQ3: Sector Erase Timer on page 30
for more information.
for erase command sequence.
D a t a
S h e e t
for more information.
No
S29AL008D
Figure 8.2 Erase Operation
Command Sequence
Erasure Completed
Write Operation Status on page 27
Write Erase
from System
Data = FFh?
Data Poll
START
Yes
Embedded
Erase
algorithm
in progress
Write Operation Status on page 27
Autoselect Command Sequence
for information on these
for more
25