Lpc2000

Doug Sutherland <doug@...> schrieb am Mon, 21 Nov 2005 01:11:38 
-0500:

> Sorry if this is a dumb question: regarding shared memory between
> processors, if I have 2 ARM processors both with memory expansion,
> can they be connected together directly on the EMI, or do I need
> some buffer hardware in between? Wondering also about the same
> thing for a DSP with memory expansion (TI Parallel Host Interface)
> connecting to ARM, direct connect is okay? I'm assuming direct
> connect only if the chip specs indicate allowable voltage tolerance.

If all the signals are tri-state (low,high, high-Z) it would work unless
you make sure no concurrent access appears on the buses.

This is IMHO kind of hard to do with "normal" CPUs, so most people use
(expensive) dual-ported SRAMs.

IMHO the idea behind is the "shared memory" paradigma used in so many
systems.

My suggestion: Use message passing and a highspeed UART or SSI.
Make the HW and SW design easier.

-- 
42Bastian Schick