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Interfacing FPGA to lpc2294 external bus

2006-01-10 by itsjustimpossible

Hi
I need to interface an FPGA to the external bus of the LPC2294 so 
that I can directly read and write to the BlockRam internal to the 
FPGA (Arranged as a dual-port RAM).

I just wondered if someone has already achieved this or knows of 
some example VHDL they can point me at. We are very new to this, 
just attended a VHDL course, and am wondering about the correct way 
to go about it.

The XCLK seems to be the key to this, but I am currently trying to 
sort out how to handle the control lines and the tri-state buffers.

The statement in the data sheet that is causing me a problem is 
the "CS and OE lines may become low one XCLK earlier than is shown". 
I assume then that I cannot use these lines directly as the address 
bus may not be stable at that point.

I know this is probably blindingly obvious, but if anyone has some 
pointers for a novice I would be very grateful.

If it makes any difference I am using an Altera Stratix.

Many thanks
Simon

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