NGW/NGW100 Memories
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Contents |
Overview
Block diagram
The memory hierarchy of the Network Gateway with the Linux mouting points is shown in the block diagram below.
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 columns | 512 (9 bit) |
Number of rows | 8k (13 bit) |
Number of banks | 4 (2 bit) |
CAS latency | 2 |
Refresh rate | 15.6uS |
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)