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EN29GL256H Datasheet(PDF) 23 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

EN29GL256H Datasheet(HTML) 23 Page - Eon Silicon Solution Inc.

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This Data Sheet may be revised by subsequent versions
©2004 Eon Silicon Solution, Inc.,
or modifications due to changes in technical specifications.
Rev. G, Issue Date: 2011/01/17
program or erase operation), and during the sector erase time-out.
During an Embedded Program or Erase algorithm operation, successive read cycles to any address
that is being programmed or erased causes DQ6 to toggle. When the operation is complete, DQ6 stops
After an erase command sequence is written, if all sectors selected for erasing are protected, DQ6
toggles for approximately 100μs, then returns to reading array data. If not all selected sectors are
protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected
sectors that are protected.
The system can use DQ6 and DQ2 together to determine whether a sector is actively erasing or is
erase 2suspended. When the device is actively erasing (that is, the Embedded Erase algorithm is in
progress), DQ6 toggles. When the device enters the Erase Suspend mode, DQ6 stops toggling.
However, the system must also use DQ2 to determine which sectors are erasing or erase-suspended.
Alternatively, the system can use DQ7.
If a program address falls within a protected sector, DQ6 toggles for approximately 1μs after the
program command sequence is written, then returns to reading array data. DQ6 also toggles during the
erase-suspend-program mode, and stops toggling once the Embedded Program Algorithm is complete.
Toggle Bit I on DQ6 requires either OE# or CE# to be de-asserted and reasserted to show the change
in state.
DQ2: Toggle Bit II
The “Toggle Bit II” on DQ2, when used with DQ6, indicates whether a particular sector is actively
erasing (that is, the Embedded Erase algorithm is in progress), or whether that sector is erase-
suspended. Toggle Bit II is valid after the rising edge of the final WE# pulse in the command sequence.
DQ2 toggles when the system reads at addresses within those sectors that have been selected for
erasure. But DQ2 cannot distinguish whether the sector is actively erasing or is erase-suspended. DQ6,
by comparison, indicates whether the device is actively erasing, or is in Erase Suspend, but cannot
distinguish which sectors are selected for erasure. Thus, both status bits are required for sector and
mode information.
Reading Toggle Bits DQ6/DQ2
Whenever the system initially begins reading toggle bit status, it must read DQ7–DQ0 at least twice in a
row to determine whether a toggle bit is toggling. Typically, the system would note and store the value
of the toggle bit after the first read. After the second read, the system would compare the new value of
the toggle bit with the first. If the toggle bit is not toggling, the device has completed the program or
erases operation. The system can read array data on DQ7–DQ0 on the following read cycle. However,
if after the initial two read cycles, the system determines that the toggle bit is still toggling, the system
also should note whether the value of DQ5 is high. If it is, the system should then determine again
whether the toggle bit is toggling, since the toggle bit may have stopped toggling just as DQ5 went high.
If the toggle bit is no longer toggling, the device has successfully completed the program or erases
operation. If it is still toggling, the device did not complete the operation successfully, and the system
must write the reset command to return to reading array data. The remaining scenario is that the
system initially determines that the toggle bit is toggling and DQ5 has not gone high. The system may
continue to monitor the toggle bit and DQ5 through successive read cycles, determining the status as
described in the previous paragraph. Alternatively, it may choose to perform other system tasks. In this
case, the system must start at the beginning of the algorithm when it returns to determine the status of
the operation.
When verifying the status of a write operation (embedded program/erase) of a memory sector, DQ6
and DQ2 toggle between high and low states in a series of consecutive and contiguous status read
cycles. In order for this toggling behavior to be properly observed, the consecutive status bit reads must
not be interleaved with read accesses to other memory sectors. If it is not possible to temporarily
prevent reads to other memory sectors, then it is recommended to use the DQ7 status bit as the
alternative method of determining the active or inactive status of the write operation.

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