Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How to fiix LUT inputs?

Status
Not open for further replies.

d0nathan

Newbie level 3
Joined
May 6, 2015
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
34
I implemented ring oscillators on an Altera Cyclone IV with Quartus II.

The compilation choses arbitrarily which inputs of the LUTs are used.
I could edit each LUT seperatly but this is very time-consuming.

Is there a way to determine which LUT inputs are used without changing each one severally?
 

Attachments

  • LE LUT.jpg
    LE LUT.jpg
    28.7 KB · Views: 85

Unfortunately, the only way to do this is but hand editing each lut. The tools are not really meant for this kind of logic.
 

Instantiate the LUTs using library primitives. I don't recall either Xilinx or Altera swapping pins when you instantiate a LUT.
 

When using cyclonexx_lcell_comb, the inputs may be reassigned by the fitter. As far as I understand, this done due to routing constraints, the routing options aren't orthogonal.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top