External Memory - Nokia NPL-4 Series Manual

NPL-4/5/RM-104
System Module and User Interface
also be used as data memory and it is byte addressable. RAM is mainly for MCU purposes
but also DSP has also access to it if needed.
MCU code is stored into external flash memory. Size of the flash is 128Mbit (8M x 16bit).
The NPL-4/5 baseband supports a burst mode flash with multiplexed address/data bus.
Access to the flash memory is performed as 16-bit access. The flash has Read While
Write capabilities, which makes the emulation of EEPROM within the flash easy.

External memory

NPL-4/5 uses Multi Chip Package Memory, which combines 128Mbit Muxed Burst Multi-
Bank NOR Flash and 16Mbit Muxed PSRAM.
The 128Mbit Flash memory is organized as 8M x16 bit and 16Mbit PSRAM is organized
as 1M x16 bit.
The memory architecture of flash memory is designed to divide its memory arrays into
263 blocks and this provides highly flexible erase and program capability.
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