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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Interfacing FPGA to lpc2294 external bus
2006-01-10 by itsjustimpossible
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