6 years ago · 775c15c29b
--- a/Images/HTML.png
+++ b/Images/HTML.png
--- a/Images/ScalaCond2.png
+++ b/Images/ScalaCond2.png
--- a/Images/Source/drawing.svg
+++ b/Images/Source/drawing.svg
@@ -0,0 +1,867 @@
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--- a/Images/counter.png
+++ b/Images/counter.png
--- a/Images/toolchain2.png
+++ b/Images/toolchain2.png
--- a/README.org
+++ b/README.org
@@ -2,11 +2,12 @@ This is the chisel intro for the TDT4255 course at NTNU.
 If you use it for your course, please let me know how it went and feel 
 free (or even slightly pressured) to submit pull requests with improvements.

 In order to get started you should go through the introductory material:
 Introduction to hardware description languages: [[./hdl.org]]

 Instructions can be found in oppgavetekst.org (read it in github if your preferred
 reader does not support .org markdown)

 TODO: Installation instructions, link to scala primer and link to other tutorials.
 Also lacking images, they're on the way.

 The main course(work) for creating a 5-stage RISCV pipeline can be found here
 https://github.com/PeterAaser/TDT4255_EX2
--- a/hdl.org
+++ b/hdl.org
@@ -1,2 +1,138 @@
 * Hardware description languages
  Hardware description languages, HDLs for short, are used to model circuits, typically digital.
  HDLs are *declarative* languages, they describe how the circuit should be constructed.
  
  This is analogous to how HTML works.
  As an example, consider creating a list:
  #+begin_src html
  <ul>
    <li>Name: Siv Jensen, Affiliation: FrP</li>
    <li>Name: Jonas Gahr Støre, Affiliation: AP</li>
    <li>Name: Bjørnar Moxnes, Affiliation: Rødt</li>
    <li>Name: Malcolm Tucker, Affiliation: DOSAC</li>
  </ul>
  #+end_src
  Which can then be rendered by an HTML engine to look something like this:
  #+CAPTION: The HTML after being rendered
  [[./Images/HTML.png]]


  Instead of describing how text should be rendered HDLs describe how wires and components in a 
  circuit should be connected.
  Although we have yet to introduce chisel, let's look at some code for a chisel circuit:
  It is not necessary to understand what is going on in this code to continue.
  #+begin_src scala
  class SimpleCounter() extends Module {
    val io = IO(
      new Bundle {
        val reg_a = Output(UInt(32.W))
      }
    )
  
    val reg_a = RegInit(0.U(8.W))
    reg_a := reg_a + 1.U
  
    io.reg_a := reg_a
  }
  #+end_src
  Just like the HTML describes a document the chisel code describes a simple circuit shown below:
  #+CAPTION: This is the caption for the next figure link (or table)
  [[./Images/counter.png]]


  In both examples the common theme is describing a *structure* for some component which must be
  rendered.
  In the HTML example the structure is *rendered* by your for instance your web-browser, and the
  same goes for the hardware description.

  While the path from HTML -> Browser is fairly short it's a lot more involved for hardware description!
  This shouldn't come as a suprise, displaying text is less complex than creating digital circuits.
  A very simplified version of this is shown here:
  #+CAPTION: Placeholder graphic
  [[./Images/toolchain.png]]
 

 * Scala and Chisel
  It is rather uncommon to write raw HTML nowadays, instead we write code that *generates* HTML.
  For the example above a generator might be written like this in scala:

  #+begin_src scala
  def generateList(politicians: List[String], affiliations: Map[String, String]): String = {
    val inner = new ArrayBuffer[String]()
    for(ii <- 0 until politicians.size){
      val nameString = politicians(ii)
      val affiliationString = affiliations(nameString)
      inner.add(s"<li>Name: $nameString, Affiliation: $affiliationString</li>")
    }
    "<ul>\n" + inner.mkString("\n") + "</ul>"
  }
  
  // Or if you prefer brevity
  def generateList2(politicians: List[String], affiliations: Map[String, String]): String = {
    val inner = politicians.map(p => s"<li>Name: $p, Affiliation ${affiliations(p)}</li>")
    "<ul>\n" + inner.mkString("\n") + "</ul>"
  }
  #+end_src
  
  In this example a scala program manipulates HTML, and these builders can then be composed together:
  #+begin_src scala
  def generateDistricts(districts: List[(String, List[String])], affiliations: Map[String, String]): String = {
    val inner = districts.map{ case(district, politicians) =>
      s"<li>$district\n" + generateList(politicians, affiliations) + "\n</li>"
    }.mkString("\n")

    s"<div>\n$inner\n</div>"
  }
  #+end_src
  
  Just like the HTML, a chisel program is just a scala program that builds a chisel hardware description, 
  thus it can be argued that "chisel program" is about as meaningless as calling the above program a 
  "html program", but nonetheless we will refer to a scala program building chisel as chisel programs.
  
  We expand upon our first toolchain description:
  #+CAPTION: Placeholder graphic
  [[./Images/toolchain2.png]]


 ** Scala -> Chisel Graph Builder
   The starting point, a scala program describing how to build a chisel graph.
   This program is not constrained in any way, it's able to do anything any other scala program does,
   it does not face any restrictions in order to use chisel.
   
   In order to go from scala to a chisel graph builder the program must first be compiled, which
   exposes invalid programs (for instance typos, usage befor declaration and similar)
   
 ** Chisel Graph Builder -> Chisel Graph
   After compiling the program can now be run.
   There are three common outcomes from the builder:

   + The builder discovers an invalid circuit
     This is analogous to a HTML tag missing

   + A wire is unconnected
     During building the builder discovered that a wire was not connected.
     This is impossible to determine during compile time (unless you solve the halting problem)
     thus it is only detected during building of the circuit.

   + The circuit is well formed and can be instantiated.
   
 ** Chisel Graph -> Simulator
   After the circuit is verified it can now be used by a simulator.
   Several simulators are available and have different advantages and disadvantages.
   If nothing else is specified the backend used is FIRRTL
   
   The simulator allows us to test how our circuit will react as its inputs are changed,
   allowing us to verify the correctness of our designs.

   This is *HUGE* in HDL land as this guarantee does not hold for many HDLs (VHDL and verilog)!
   In the days of yore it was very common to see circuits being well behaved in the simulator
   and misbehaving on an FPGA, but this is not the case with chisel.
   The reason for this is that chisel adopts a fully synchronous model, but it is sufficient that
   you know that chisel won't lie to you like VHDL would.
 
 ** Chisel Graph -> Hardware
   This is not part of the course, but for the interested the approach here is to generate verilog
   from the chisel graph which is then used in a vendor specific toolchain for FPGAs or even ASICs.
   
   These toolchains are generally not very fun to use, not only because they are made by very very
   evil people, but because hardware is a difficult, complex and complicated domain.
--- a/introduction.org
+++ b/introduction.org
@@ -4,6 +4,8 @@
  In this exercise you will implement a circuit capable of performing matrix 
  matrix multiplication in the chisel hardware description language.
  
  The 
  
 * Chisel
 ** Prerequisites
   + *You should have some idea of how digital logic circuits work.*