Tags » NCL

NCL Multiplexer Implementation

Design Recap

4-Option Example

for Case in 0 to N-1
  
  -- CaseBits is a concatenated signal from the iSelector input
  Selectors(Case) <= THNN(CaseBits)

  GatedCase0 <= TH22(Selectors(Case), iOptions(Case).DATA0)
  GatedCase1 <= TH22(Selectors(Case), iOptions(Case).DATA1)
next Case

output.DATA0 <= TH1N(Gated00, Gated10, Gated20, Gated30, ...)
output.DATA1 <= TH1N(Gated01, Gated11, Gated21, Gated31, ...) 866 more words
NCL

NCL Multiplexer Design

Theory

Multiplexers are components that let you switch between different options for a signal. They take in some number of option values (usually a power of 2) and a selector. 398 more words

NCL

Using an NCL Register

In this post, I described what a NCL register is. I wanted to get a more practical understanding of what the register does and how different pipeline stages interact. 185 more words

NCL

NCL Full Adder Implementation

Design Recap

The circuit from my last post:

oS.1:
TH12(
  TH22(
    TH13(iA.1, iB.1, iC.1), -- 1 <= NumBits
    TH23(iA.0, iB.0, iC.0)), -- NumBits < 2
  TH33(iA.1, iB.1, iC.1))); -- 3 <= NumBits

oS.0:
TH12(
  TH33(iA.0, iB.0, iC.0), -- NumBits < 1
  TH22(
    TH23(iA.1, iB.1, iC.1), -- 2 <= NumBits
    TH13(iA.0, iA.0, iA.0)); -- NumBits < 3

oC.1: TH23(iA.1, iB.1, iC.1) -- 2 <= NumBits

oC.0: TH23(iA.0, iB.0, iC.0) -- NumBits < 2… 662 more words
NCL

NCL Full Adder Design

Theory

Like the Half Adder, a Full Adder counts it’s inputs. The full Adder counts three of them though. This to account for the carry in of the previous bit. 518 more words

NCL

NCL Register Implementation

See this post for the design of the NCL Register.

Implementation

I implemented this module structurally, with a for...generate (you’ll find that I’m a big fan of generics if you keep up with the blog). 322 more words

NCL

NCL Half Adder Implementation

See this post for the theory and design of the NCL Half Adder.

Design Recap

Here’s the circuit design:

(simple version)

(optimized version)

The top two gates are THxor0 gates, the next is a TH34w22, and the last one is a TH22 gate. 584 more words

NCL