Puzzle 100 of 100

Three outputs in turn

Goal

Make X high for two clock periods, then Y for one, then Z for one, and repeat.

Die: 35 by 29 squares
Layers: Metal, Polysilicon, Contact, N active, P active, N well, Metal 2, Via
Inputs: CLK, CLKN
Outputs: X, Y, Z
Supply: VDD, VDD
Ground: GND, GND

New in this puzzle

Outputs from states

A small controller is a counter with gates that turn its states into outputs. Each output is high in the states it is decoded from.

Hint

Build the twisted ring of two flip-flops. X is QN1. Y is high in the state 11, a NOR gate of QN0 and QN1, and Z in the state 01, a NOR gate of Q0 and QN1.

Solution

This is the game's reference drawing for the puzzle. It meets the goal and passes the design rules. Other drawings can pass as well.

Top View of the solved die for puzzle 100, Three outputs in turn, with the Side View below it. — Top View of the solved die, captured from the game. Paths that carry a high level at the moment shown are lit. The Side View below cuts through the row between the dashed lines.

The game window in Isometric View with the solved die for puzzle 100, Three outputs in turn, the guide, and the scope. — The whole game window in Isometric View. The scope on the right compares each output with its target band, and the message above it confirms that the drawing passes.

Solution drawing for puzzle 100, Three outputs in turn, drawn on a numbered grid with every layer in its game color and pattern. — The solution on the grid. Squares are numbered from the top left corner, so you can count them. The dashed outline marks the squares you draw, change, or erase; the rest is drawn when the puzzle opens.

Legend

Metal316 squares
Polysilicon88 squares
Contact54 squares
N active32 squares
P active32 squares
N well132 squares
Metal 2378 squares
Via63 squares
Input padCLK, CLKN
Output padX, Y, Z
Supply padVDD, VDD
Ground padGND, GND
Squares you draw, change, or erase257 squares

About the drawing

The drawing uses 647 of the die's 1015 squares.
Part of the drawing is in place when the puzzle opens. To finish it, paint 229 empty squares and change 28 drawn squares.
It forms 24 transistors: 12 N transistors and 12 P transistors. Each one is a place where polysilicon crosses active silicon.
54 contacts join metal to the polysilicon or active silicon under it.
63 vias join metal 2 to the metal under it.

Starting drawing for puzzle 100, Three outputs in turn, on a numbered grid. — The drawing when the puzzle opens. The dashed outline marks the squares the solution changes.