This Data Sheet may be revised by subsequent versions

©2003 Eon Silicon Solution, Inc., www.eonssi.com

or modifications due to changes in technical specifications.

11

EN39LV010

Rev. B, Issue Date: 2009/03/16

When the Embedded Erase algorithm is complete, the device returns to reading array data and addresses

are no longer latched. The system can determine the status of the erase operation by using DQ7, DQ6, or

DQ2. Refer to “Write Operation Status” for information on these status bits. Flowchart 4 illustrates the

algorithm for the erase operation. Refer to the Erase/Program Operations tables in the “AC

Characteristics” section for parameters, and to the Sector Erase Operations Timing diagram for timing

waveforms.

Erase Suspend / Resume Command

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. The Erase Suspend command is ignored if written during the chip erase operation

or Embedded Program algorithm. 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.

After the erase operation has been 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 “Write Operation Status”

for information on these 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 “Write Operation Status” for more

information. The Autoselect command is not supported during Erase Suspend Mode.

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 has resumed erasing.

WRITE OPERATION STATUS

DQ7: DATA Polling

The EN39LV010 provides DATA Polling on DQ7 to indicate to the host system the status of the

embedded operations. The DATA Polling feature is active during the embedded Programming,

Sector Erase, Chip Erase, Erase Suspend. (See Table 6)

When the embedded Programming is in progress, an attempt to read the device will produce the

complement of the data last written to DQ7. Upon the completion of the embedded Programming, an

attempt to read the device will produce the true data last written to DQ7. For the embedded

cycle sequence.

When the embedded Erase is in progress, an attempt to read the device will produce a “0” at the

DQ7 output. Upon the completion of the embedded Erase, the device will produce the “1” at the DQ7

output during the read. For Chip Erase, the DATA polling is valid after the rising edge of the sixth

W E or

CE pulse in the six-cycle sequence. For Sector Erase, DATA polling is valid after the last

rising edge of the sector erase W E or C E pulse.