I'm doing a pretty complex state machine, which is perfect for in memory (blockRAM based) encoding.
Before I go through and build my own state machine compiler out of python hack-scripts or Excel macros, does someone already have such a compiler available?
-- Nicholas C. Weaver. to reply email to "nweaver" at the domain icsi.berkeley.edu
"Nicholas Weaver" schrieb im Newsbeitrag news:coikr1$11p9$ snipped-for-privacy@agate.berkeley.edu...
XST offers an option to put logic into BRAMS. But I dont know if it is smart enough to put the FSM into the BRAM.
Regards Falk
There really should be a couple of good examples out there someplace, if nothing else, for times like this.
I know of two general ways to do it:
One is to think like a state machine. Write a program that iterates through each address, unpacks the address into current-state and input signals, sets up default output conditions... Then the body of the loop acts like the state machine - big case statement, inspecting the input flags, setting up next-state and output bits... Then the tail of the program packs up the output and writes out the ROM data.
The other way is to think like microcode. For that, you want an assembler. This is basically encoding the current-state in the PC. The assembler can be really really simple, but it sure helps to have one to copy from. Branching is usually done by ORing/MUXing bits into the PC.
I'm likely to get a hack-attack sometime. What's a good sample state machine that will run on the Spartan 3 starter kit? (Maybe blink LEDs or something)
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Or, the tools should support it directly ? :)
Traffic lights is a common one.
You can use a Macro Assembler to create new opcodes, and so use the framework of a standard assembler for this task.
I'm not sure if the assemblers that Xilinx include are this powerful, but they would be a natural choice.
If you want to create your own variant assembler, then this is a good starting point :
and I saw this recently, and thought it had to have a use, sometime... Your RAM state engine could be it ?
The old registered PROMS were often used as state engines, and that's really what you have here, might be some old tools about that support this ?
-jg
picoblaze might be a good fit.
HTH, Jim snipped-for-privacy@yahoo.com (remove capital letters)
smart
NO
Antti
if you are using xilinx devices, picoblaze could be a smart solution for (medium) complex state machines... VHDL source and some (mostly DOS/Win32 based) assemblers are avaiable (for free).
Just take a look at:
WD
Picoblaze is probably significantly slower and larger: The core of the state machine needs to be at 125 MHz.
But thanks for the suggestion.
-- Nicholas C. Weaver. to reply email to "nweaver" at the domain icsi.berkeley.edu
picoblaze could possible run at 125MHz too, but it takes a little more resources than BRAM based statemachine.
I really wonder there is no BlockRAM statemachine tool yet available, the "core" itself itself is plain simple so only some script is needed to prepare the rom contents. I hope I could find time todo it !
Antti
Check our web site
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Walter.
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