NGW/NGW100 Memories

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Contents


Overview

Image:ngw_memory_overview.png

Block diagram

The memory hierarchy of the Network Gateway with the Linux mouting points is shown in the block diagram below.

Image:NGW100MemoryHirarchy.gif

SDRAM

The SDRAM on the Network Gateway is 256 Mbit (4M x 16 bits x 4 banks) or 32MB, with a 16 bit bus to the AP7000.

Memory parameters:

Number of columns512 (9 bit)
Number of rows8k (13 bit)
Number of banks4 (2 bit)
CAS latency2
Refresh rate15.6uS
Recovery time 2ck

Parallel flash

The boot flash is a 64 Mbit (8MB) flash with a 16 bit bus to AP7000.

The parallel flash is preloaded with U-Boot and an embedded Linux environment.

Serial data flash

The serial data flash is attached to AP7000's SPI0 interface (CS0) and is preloaded with the Linux file system. (Program and data for the Network gateway functionality)

Static version created: 2007-03-07
Copyright (c) 2007 Atmel Corporation