Introduction

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Contents

The step-by-step procedure

Here you can find a detailed description of the state transitions that occur in the counter. The counter has four states, R1 to R4.

  • start state

Counter layered start phase.png

S is active, R1 is active

  • transition to state R2

Counter layered start to R2.png

S is deactivated, R1 is still present (but fading) and represses R4. R2 gets produced

  • state R2

Counter layered R2.png

S is inactive, R2 is active

  • transition to state R3

Counter layered R2 to R3.png

S is activated, R2 is still present (but fading) and represses R1. R3 gets produced

  • state R3

Counter layered R3.png

S is active, R3 is active

  • transition to state R4

Counter layered R3 to R4.png

S is deactivated, R3 is still present (but fading) and represses R2. R4 gets produced

  • state R4

Counter layered R4.png

S is inactive, R4 is active

  • transition to state R1 (start state)

Counter layered R4 to R1.png

S is activated, R4 is still present (but fading) and represses R3. R1 gets produced

  • ...and we return to the start state

Counter layered start phase.png

S is active, R1 is active

breakdown into modules

The counter can be partitiond into two (fairly) independent devices:

  • Input Module
  • NOR Module

Both are designed as PoPS input - PoPS output devices (as specified in the MIT nomenclature)

Input Module

In this device, we want to capsule the path from S to the R's:

Counter layered input box.png


If we leave away the parts that don't belong to the Input Module, we are left with

Counter layered input box only.png


As an abstract model the Input device looks as follows:

Input device.png

Input graph.png

One of the outputs (PoPS OUT1) should be high and the other (PoPS OUT2) low when the PoPS IN is high and vice versa when PoPS IN is low.

NOR Module

In this device, we want to capsule the regulatory pathways between the R's. We just pick one R as output to show the principle. If we have this device available, we can just copy it to get the regulatory pathways for the other R's.

Counter layered NOR box.png


If we leave away the parts that don't belong to the NOR Module, we are left with

Counter layered NOR box only.png

As an abstract model the NOR device looks as follows:

NOR device popsbox.png

NOR graph.png

PoPS IN1 and PoPS IN2 are connected in a NOR-like fashion to obtain PoPS OUT. If both inputs are high, the output will be repressed slightly more effective.

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