S29GL032A datasheet(60/95 Pages) SPANSION

60 / 95 page

S29GL-A

S29GL-A_00_A11 September 10, 2007

Da ta

Sh e e t

10.1

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. 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.

When the Erase Suspend command is written during the sector erase operation, the device requires a typical

of 5

μs (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 device 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.) 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 Write Operation Status on page 63 for information on these

status bits.

After an erase-suspended program operation is complete, the device 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 word program operation. Refer to Write Operation Status on page 63 for more information.

In the erase-suspend-read mode, the system can also issue the autoselect command sequence. Refer to

Autoselect Mode on page 40 and Autoselect Command Sequence on page 53 sections for details.

To resume the sector erase operation, the system must write the Erase Resume command. Further writes of

the Resume command are ignored. Another Erase Suspend command can be written after the chip resumes

erasing.

Note

During an erase operation, this flash device performs multiple internal operations which are invisible to the

system. When an erase operation is suspended, any of the internal operations that were not fully completed

must be restarted. As such, if this flash device is continually issued suspend/resume commands in rapid

succession, erase progress is impeded as a function of the number of suspends. The result is a longer

cumulative erase time than without suspends. Note that the additional suspends do not affect device reliability

or future performance. In most systems rapid erase/suspend activity occurs only briefly. In such cases, erase

performance is not significantly impacted.

S29GL032A Datasheet(PDF) 60 Page - SPANSION