JS48F4400PCZ00 datasheet(10/102 Pages) NUMONYX

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Numonyx™ Wireless Flash Memory (W18)

Datasheet

November 2007

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

and verifications necessary to manage flash memory program and erase. An internal

Status Register provides ready/busy indication results of the operation (success, fail,

and so on).

Three power-saving features– Automatic Power Savings (APS), standby, and RST# –

can significantly reduce power consumption. The device automatically enters APS mode

following read cycle completion. Standby mode begins when the system deselects the

flash memory by

de-asserting CE#. Driving RST# low produces power savings similar to standby mode.

It also resets the part to read-array mode (important for system-level reset), clears

internal Status Registers, and provides an additional level of flash write protection.

2.1

Memory Map and Partitioning

The W18 device is divided into 4-Mbit physical partitions, which allows simultaneous

RWW or RWE operations and allows users to segment code and data areas on 4-Mbit

boundaries. The device’s memory array is asymmetrically blocked, which enables

system code and data integration within a single flash device. Each block can be erased

independently in block erase mode. Simultaneous program and erase operations are

not allowed; only one partition at a time can be actively programming or erasing. See

Table 3, “Bottom Parameter Memory Map” on page 11 and Table 4, “Top Parameter

Memory Map” on page 12.

The 32-Mbit device has eight partitions, the 64-Mbit device has 16 partitions, and the

128-Mbit device has 32 partitions. Each device density contains one parameter

partition and several main partitions. The 4-Mbit parameter partition contains eight 4-

Kword parameter blocks and seven 32-Kword main blocks. Each 4-Mbit main partition

contains eight 32-Kword blocks each.

The bulk of the array is divided into main blocks that can store code or data, and

parameter blocks that allow storage of frequently updated small parameters that are

normally stored in EEPROM. By using software techniques, the word-rewrite

functionality of EEPROMs can be emulated.

JS48F4400PCZ00 Datasheet(PDF) 10 Page - Numonyx B.V