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RC48F4400PWY00 Datasheet(PDF) 10 Page - Numonyx B.V |
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RC48F4400PWY00 Datasheet(HTML) 10 Page - Numonyx B.V |
10 / 102 page Numonyx™ Wireless Flash Memory (W18) Datasheet November 2007 10 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. . |
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