Chipy

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Chipy is a single-file python module for generating digital hardware.

Project description

Chipy – Constructing Hardware In PYthon

Chipy is a single-file python module for generating digital hardware. Chipyprovides a simple and clean API for writing Verilog code generators. Structuraland behavioral circuit modelling is supported.

A Simple Example

The following is a simple Chipy example design:

from Chipy import *

clk = AddInput(“CLK”)sub = AddInput(“SUB”)a, b = AddInput(“A B”, 32)out = AddOutput(“OUT”, 32, posedge=clk)

with If(sub):

out.next = a - b

with Else:

out.next = a + b

The AddModule function adds a new module to the design and return it. Toadd elements to a module, create a with <module>: … block and call thecorresponding Add… functions from within that block.

Many functions and expressions in Chipy code return a signal. E.g.AddInput(..), AddOutput(..), or a + b in the above code. Somesignals are registers, which just means that they can be assignedto, either by calling Assign(<assignee>, <value>) or by assigningto the .next attribute, as demonstrated in the code above.

Registers also need a synchronisation element, such as a FF, assigned to them.This can either be done by calling functions such as AddFF(..), or in simplecases using keyword arguments such as posedge=<clk_signal> when creatingthe register itself.

Registers that are not assigned a value and/or do not have a synchronizationelement will cause a runtime error in WriteVerilog.

Finally assignments can be conditional, enabling behavioral modelling. This isdone by putting the assignments in blocks such as with If(..): … orwith Else:.

Here is a different version of the design, demonstrating some of the variationsmentioned so far:

from Chipy import *

clk = AddInput(“CLK”)sub = AddInput(“SUB”)a, b = AddInput(“A B”, 32)out = AddOutput(“OUT”, 32)

with If(sub):

Assign(out, a - b)

with Else:

Assign(out, a + b)

AddFF(out, posedge=clk)

Chipy Reference Manual

Chipy maintains a global design state that contains a set of (Verilog/RTL)modules and a stack of design contexts. The Chipy Add* functions are used toadd elements to the design in memory. Chipy APIs that are used with the Pythonwith statement are used to maintain the stack of design contexts. The currentcontext determines for example to which module a new instance or wire should beadded. So for example, the AddInput function does not have a parameter thattells it to which module to add a new input port. Instead the input port isadded to the module referenced to by the current context.

Creating modules and generating Verilog

### AddModule(name)

This function adds a new module to the design. The module created by this functionis returned. A Python with block using a Chipy module as argument is used tocreate a new Chipy context that can be used to add elements to the module. Forexample, the following will create a new module demo with an input port clk:

demo_mod = AddModule(“demo”)

with demo_mod:

AddInput(“clk”)

### Module(name=None)

This functions looks up the module with the specified name. If no such moduleis found, None is returned. If the name parameter is omitted then the modulereferenced by the current context is returned.

### WriteVerilog(f)

This function write the current design to the specified file handle. The filehas to be opened first using for example the Python open function:

with open(“demo.v”, “w”) as f:

WriteVerilog(f)

### ResetDesign()

This function resets the global Chipy state, e.g. for when multiple designs arecreated from one Python script.

Adding inputs and outputs

### AddInput(name, type=1)

This function adds a new input port to the current module. The new signal isreturned. If name contains more than one white-space separated token, thenmultiple ports are created at once and a list is returned. For example:

with AddModule(“demo”):

clk, a, b = AddInput(“clk a b”)

The type argument specifies the width of the new signal. A negative numberdenotes a signed signal, i.e. the value 5 would be used to create an unsigned5 bit wide signal, and the value -5 would be used to create a signed 5 bitwide signal.

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Instead of an integer, an interface (see below) can be passed as type forthe new signal. In that case multiple input ports are generated, as specified bythe interface, and a bundle (see blow) of those signals is returned.

### AddOutput(name, type=1, posedge=None, negedge=None, nodefault=False, async=False)

Like AddInput, but adds and output port. The signals returned by this functionsare registers, i.e. they have a .next member that can be assigned to.

The keyword arguments posedge, negedge, and nodefault cause AddOuput toautomatically call AddFF (see below) on the generated registers. Similarly,async=True causes AddOuput to call AddAsync (see below) on the generatedregisters.

Registers and synchronization elements

### AddReg(name, type=1, posedge=None, negedge=None, nodefault=False, async=None)### AddFF(signal, posedge=None, negedge=None, nodefault=False)### AddAsync(signal)### Assign(lhs, rhs)

Signals and expessions

### Sig(arg, width=None)### Sig Operators### Cond(cond, if_val, else_val)### Concat(args)### Repeat(num, sig)

Bundles

### Bundle(arg=None, **kwargs)### Bundle.add(self, name, member)### Bundle.get(name)### Bundle.regs() and Bundle.regs()### Bundle.keys(), Bundle.values(), Bundle.items()### Zip(bundles, recursive=False)### Module.bundle(self, prefix=””)

Interfaces

### AddPort(name, type, role, posedge=None, negedge=None, nodefault=False, async=None)### Module.intf(self, prefix=””)### Stream(data_type, last=False, destbits=0)

Memories

### AddMemory(name, type, depth, posedge=None, negedge=None)### Memory read and write### Memory bundles

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Hierarchical Designs

### AddInst(name, type)### Connect(sigs)

Behavioral Modelling

### If, ElseIf, Else### Switch, Case, Default

Todos

• Complete documentation
• More testcases / examples
• Improved error reporting
• Bundles: flat, unflat, Map, concat
• Verilog Primitive Inst
• Backbox modules
• Label(name, sig)

License

Chipy – Constructing Hardware In PYthon

Copyright (C) 2016 Clifford Wolf <clifford@clifford.at>

Permission to use, copy, modify, and/or distribute this software for anypurpose with or without fee is hereby granted, provided that the abovecopyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIESWITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OFMERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FORANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGESWHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN ANACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OFOR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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