sentences: This paper presents a simulated memristor crossbar implementation of a deep Convolutional Neural Network (CNN). In the past few years deep neural networks implemented on GPU clusters have become the state of the art in image classification. They provide excellent classification ability at the cost of a more complex data manipulation process. However once these systems are trained, we show that the analog crossbar circuits in this paper can highly parallelize the recognition phase of a CNN algorithm. One of the drawbacks of using memristors to carry out computations is that the data stored will likely have less precision when compared to typical 32-bit floating point memory. However, we show the proposed system is capable of operating with zero loss in classification accuracy if the memristors utilized are able to store at least 16 unique values (essentially acting as 4-bit devices). To the best of our knowledge, this is the first paper that presents a memristor based circuit for implementing CNN recognition. This is also the first paper that provides a circuit for precise memristor based analog convolution.