28F256L30 データシートの表示（PDF） - Numonyx -> Micron
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28F256L30 Datasheet PDF : 102 Pages
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Numonyx™ StrataFlash® Wireless Memory (L30)
2.0
Functional Overview
This section provides an overview of the features and capabilities of the L30 device.
The L30 device provides read-while-write and read-while-erase capability with density
upgrades through 256-Mbit. This family of devices provides high performance at low
voltage on a 16-bit data bus. Individually erasable memory blocks are sized for
optimum code and data storage.
Each device density contains one parameter partition and several main partitions. The
flash memory array is grouped into multiple 8-Mbit or 16-Mbit partitions. By dividing
the flash memory into partitions, program or erase operations can take place at the
same time as read operations.
Although each partition has write, erase and burst read capabilities, simultaneous
operation is limited to write or erase in one partition while other partitions are in read
mode. The Numonyx™ StrataFlash® Wireless Memory (L30) allows burst reads that
cross partition boundaries. User application code is responsible for ensuring that burst
reads don’t cross into a partition that is programming or erasing.
Upon initial power up or return from reset, the device defaults to asynchronous page-
mode read. Configuring the Read Configuration Register enables synchronous burst-
mode reads. In synchronous burst mode, output data is synchronized with a user-
supplied clock signal. A WAIT signal provides easy CPU-to-flash memory
synchronization.
In addition to the enhanced architecture and interface, the device incorporates
technology that enables fast factory program and erase operations. Designed for low-
voltage systems, the Numonyx™ StrataFlash® Wireless Memory (L30) supports read
operations with VCC at 1.8 V, and erase and program operations with VPP at 1.8 V or 9.0
V. Buffered Enhanced Factory Programming (Buffered EFP) provides the fastest flash
array programming performance with VPP at 9.0 Volt, which increases factory
throughput. With VPP at 1.8 V, VCC and VPP can be tied together for a simple, ultra low
power design. In addition to voltage flexibility, a dedicated VPP connection provides
complete data protection when VPP is less than VPPLK.
A Command User Interface (CUI) is the interface between the system processor and all
internal operations of the device. An internal Write State Machine (WSM) automatically
executes the algorithms and timings necessary for block erase and program. A Status
Register indicates erase or program completion and any errors that may have occurred.
An industry-standard command sequence invokes program and erase automation. Each
erase operation erases one block. The Erase Suspend feature allows system software to
pause an erase cycle to read or program data in another block. Program Suspend
allows system software to pause programming to read other locations. Data is
programmed in word increments.
The Numonyx™ StrataFlash® Wireless Memory (L30) offers power savings through Automatic
Power Savings (APS) mode and standby mode. The device automatically enters APS
following read-cycle completion. Standby is initiated when the system deselects the
device by deasserting CE# or by asserting RST#. Combined, these features can
significantly reduce power consumption.
The Numonyx™ StrataFlash® Wireless Memory (L30)’s protection register allows
unique flash device identification that can be used to increase system security. Also,
the individual Block Lock feature provides zero-latency block locking and unlocking.
November 2007
Order Number: 251903-11
Datasheet
9
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