SRFF in HDL?

[LionelGoulet]

Am I correct in discovering that one canNOT synthesize an SR flip-flip in HDL? When I LOAD the following HDL, I get the following error message: CHIP SRFF { IN S, R; OUT Q, Qbar; PARTS: Nor (a=S, b=Q, out=Qbar); Nor (a=R, b=Qbar, out=Q); } This chip has a circle in its parts connections: SRFF.hdl I would REALLY LIKE to demonstrate a D Flip-Flop to my students, starting with an SR Flip-Flop. Is there anything I can do?

[cadet1620]

LionelGoulet wrote

Am I correct in discovering that one canNOT synthesize an SR flip-flip in HDL?

That's correct. Nand2Tetris can only simulate synchronous sequential circuits.

I strongly recommend Logisim. It's a GUI based logic simulator that will let you demonstrate Nand latches and how to build flip-flops from them.

Another good resource for learning about various sorts of flip-flops (an lots of other electronics, too) is http://play-hookey.com/digital/.

--Mark

[LionelGoulet]

Mark:

 

That’s great! Logism is just what I was looking for (given not HDL). You guys are so helpful!!!

 

-LLiioonneell

Lionel Goulet

[phone]

Te Deum

 

From: cadet1620 [via Nand2Tetris Questions and Answers Forum] [mailto:[hidden email]]
Sent: Thursday, September 26, 2013 2:49 PM
To: LionelGoulet
Subject: Re: SRFF in HDL?

 

LionelGoulet wrote

Am I correct in discovering that one canNOT synthesize an SR flip-flip in HDL?

That's correct. Nand2Tetris can only simulate synchronous sequential circuits.

I strongly recommend Logisim. It's a GUI based logic simulator that will let you demonstrate Nand latches and how to build flip-flops from them.

Another good resource for learning about various sorts of flip-flops (an lots of other electronics, too) is http://play-hookey.com/digital/.

--Mark

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