Connection between MCU & FPGA

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tiwari.sachin

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I have a a board that has a FPGA & a MCU and both communicate with eachother.

MCU works on 3.3V & FPGA needs 3.3V, 2.5V & 1.8V

I have used resistors on all connections between FPGA and MCU as given in image.

Are they really needed? Cant I just short them all (this would save a lot of space on board)

MCU is LPC1788 & FPGA is 5CEBA5F23C8N

All the signal communication is Digital

 

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Hi,
tiwari.sachin said:
Are they really needed?
Click to expand...
For DC, look at the datasheets for the IO specification.

If there are lengthy traces / wires, then the resistors may improve ringing.
We can´t validate it with the given informations.

Klaus
 

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Intel has application note AN447 discussing series termination. Due to the fast edges, resistors are recommended even for rather short connections of 10 or 20 mm length. Reduced drive strength and slew rate should allow longer unterminated connections.
--- Updated ---

Presume you want to use EMC interface of the Cortex M3, the pin list in post #1 misses the memory RW control signals.
 
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