[sdiy] Which programable chip?

[johnspeth at yahoo.com]

You're describing a sequentially clocked and cycled mux.  Such a design would easily fit into an 8, 16, or 32 bit microcontroller provided the pin count meets your requirements.  Clock latency shouldn't be a problem on most modern day devices.

It will also fit into all your other target candidates: PLDs etc and even an FPGA.  I think it's a matter of where your skills lie.  If it was me, I'd use a microcontroller, whichever one I happen to have on hand.

JJS


----- Original Message ----
> From: Ian Smith <taciturn_unquiet at hotmail.com>
> To: synth diy <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, April 15, 2009 8:02:40 AM
> Subject: [sdiy] Which programable chip?
> 
> 
> Hey all,
> While in the lull of waiting for things to arrive so I can test a design, I came 
> up with an idea that will probably have to be implemented with some sort of 
> programable chip because a CMOS chip count of 32+ is a bit hideous. 
> Here's the description:Sequential patch matrix...8 inputs8 outputsLEDs to 
> indicate which input is currently linked to which outputone sequencer to cycle 
> through the inputs one sequencer to cycle through the out putseither can count 
> up or downboth sequencers have a separate internal clock and external clock 
> inbeen thinking about a random mode, because who doesn't like randomness?
> It's a simple module, really, but to do it fully in analog would render a nasty 
> part count and large boards. So, what sort of chip should I use? PIC, CPLD, PLD, 
> FPGA? I 'd rather just program in the switches and Multiplexers and leave the 
> clocking to analog circuitry.
> -Ian Smith
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