3DCenter.org has published an AMD Zen block diagram "with little speculation". The diagram was drawn up from a software patch published by an AMD Technical Staff member called Venkataramanan Kumar.

Silverthorne is a 64-bit, multithreaded processor with a 16-stage, in-order pipeline. As you can see from the diagram below, instructions flow from the 32KB L1 I-cache into a set of fetch buffers ...