hi
Each processing node has its local memory and global memory to share. Each processor and its local memory are connected with local bus. There are also 'routing' issue and 'arbitration' issue.
then
'Is it possible to make MESH-interconnected on-chip 4 processors using BUS ? '
It implicitly mean the interconnection between switches can be a 'bus'.....Maybe my knowledge is short to answer the following question
Thankyou for your remark for beginner
What the heck are you trying to do? I'm trying to imagine a system that shares memory like this- it's asking for trouble IMHO.
I take it you mean its local memory is private, the global memory is shared.
It's certainly possible... no different conceptually from dual port RAM- everybody is isolated from the shared RAM by 3 state buffers, when you get your go on the shared area you control the address, data and control lines as normal.
As for arbitration, that depends on what you want to do. A simple system would just allow the first to grab the bus, and put everyone else on hold until the access is finished, then let the next have a go. Easy enough with DPR, with 4 on the go you'd have to queue the waiting processors.
Paul Burke
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