28F128L18 データシートの表示（PDF） - Numonyx -> Micron

部品番号

コンポーネント説明

メーカー

28F128L18

Numonyx™ StrataFlash Wireless Memory (L18)

Numonyx -> Micron 

Numonyx™ StrataFlash® Wireless Memory (L18)

2.0

Functional Overview

The Numonyx™ StrataFlash® Wireless Memory (L18) 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 (L18) allows burst reads that

cross partition boundaries. User application code is responsible for ensuring that burst

reads do not 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 Numonyx™ StrataFlash®

Wireless Memory (L18) incorporates technology that enables fast factory program and

erase operations. Designed for low-voltage systems, the Numonyx™ StrataFlash®

Wireless Memory (L18) supports read operations with VCC at 1.8 volt, 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 Numonyx™ StrataFlash® Wireless Memory (L18). 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 (L18) 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 (L18)’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.

Datasheet

10

November 2007

251902-12

Share Link: