Bus interfaces & FSMs

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Well, when I wrote an OPB->ISA bus bridge I used FSMs for both bus=20 interfaces. A FSM makes it quite simple to achieve operation according=20 to the bus specs due to its sequential nature. I didn't look into other=20 methods though so I can't say a FSM is the best solution. Any basic book =

on VHDL/Verilog, or the Xilinx docs for that matter, should give you=20 hints on how to code a state machine.

Johan

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----------------------------------------------- Johan Bernsp=E5ng, snipped-for-privacy@xfoix.se Research engineer, embedded systems

Totalf=F6rsvarets forskningsinstitut Swedish Defence Research Agency

Please remove the x's in the email address if replying to me personally.

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"Jason Berringer" wrote

First of all: what doi you consider to ba e FSM and what to be no FSM? You won't be able to implement a bus interface without any kind of statemachine if you consider a counter to be a statemachine. I would use a dedicated FSM to get a reusable structure with easy debugging abbilities (if your timing and area needs allow you to use one).

bye Thomas