NCHW input matrix to Dm conversion logic for convolution in cuDNN

I have been trying to understand the convolution lowering operation shown in the cuDNN paper. I was able to understand most of it by reading through and mapping various parameters to the image below. However, I am unable to understand how the original input data (NCHW) was converted into the Dm matrix shown in red.

The ordering of the elements of the Dm matrix does not make sense. Can someone please explain this?