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A system file (name.sys) contains a specification for the connectivity of components in a DNA system. It specifies each component and and ties their signal sequences together. A system may be used as a component in a larger system.

Comments

The pound sign (#) denotes that the rest of the line is a comment (python/sh style comments):

# This is a comment

Comments may appear on their own lines or after a command, like so:

import And22  # Half adder is used in the first layer only

System Declaration {#system_declaration}

In the spirit of Matlab's first line declarations, each system needs to have a declaration statement at the first line of code. Syntax:

declare system <name>: <inputs> -> <outputs>

For example:

declare system HalfAdder: x0 + y0  ->  s0 + c1

The <inputs> and <outputs> are '+' separated lists of sequences that will be constrained to components below.

These are used if this is a system being used as a component. However, for top-level systems, we will not have inputs and outputs and so

<name> should be the same as the base name of the component file (i.e. this file should be HalfAdder.comp).

Imports

In order to use a component file you must import it first (python-style). Syntax:

import <component name>

For example:

import And22

You may import from a different directory/name than the name you use in the file. For example:

import Georg0711/Parallel_And22 as And22

which would import from the component file 'Parallel_And22.comp' from the directory 'Georg0711/', but still use the name And22 in the specification.

Components

This is the meat of the circuit file. You must make one statement for each component in the DNA system specifying the input and output sequences. The syntax is:

component <name> = <component name>: <list of input sequences> -> <list of output sequences>

for example

component G0_01 = And22: nx0 + y0  ->  s0 + nc1

Note: Components may have 0 inputs or 0 outputs (or even both, if you can find that useful). Example:

component DNS0 = Detector: ns0 ->

Is a 'ns0' detector. It will activate if ns0 is input but doesn't produce any outputs for downstream gates.

Examples