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EN29GL256H Datasheet(PDF) 22 Page - Eon Silicon Solution Inc.

Part No. EN29GL256H
Description  256 Megabit (32768K x 8-bit / 16384K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only
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Maker  EON [Eon Silicon Solution Inc.]
Homepage  http://www.essi.com.tw
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EN29GL256H Datasheet(HTML) 22 Page - Eon Silicon Solution Inc.

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This Data Sheet may be revised by subsequent versions
©2004 Eon Silicon Solution, Inc.,
www.eonssi.com
or modifications due to changes in technical specifications.
22
EN29GL256H/L
Rev. G, Issue Date: 2011/01/17
After an erase command sequence is written, if all sectors selected for erasing are protected, Data#
Polling on DQ7 is active for approximately 100 µs, then the device returns to the read mode. If not all
selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and
ignores the selected sectors that are protected. However, if the system reads DQ7 at an address within
a protected sector, the status may not be valid.
Just prior to the completion of an Embedded Program or Erase operation, DQ7 may change
asynchronously with DQ6-DQ0 while Output Enable (OE#) is asserted low. That is, the device may
change from providing status information to valid data on DQ7. Depending on when the system
samples the DQ7 output, it may read the status or valid data. Even if the device has completed the
program or erase operation and DQ7 has valid data, the data outputs on DQ6-DQ0 may be still invalid.
Valid data on DQ7-D00 appears on successive read cycles.
Figure 7. Write Operation Status Flowchart
DQ6: Toggle Bit I
Toggle Bit I on DQ6 indicates whether an Embedded Program or Erase algorithm is in progress or
complete, or whether the device has entered the Erase Suspend mode. Toggle Bit I may be read at any
address, and is valid after the rising edge of the final WE# pulse in the command sequence (prior to the


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