Introduced: March 2011. See Jim Duffy in Network World.
The Cisco Nexus 3064PQ and 3064X are Trident+ based switches. The X replaces the PQ which is no longer for sale. The Cisco Nexus 3000 Series NX-OS Quality of Service Command Reference allows a deduction that the buffer memory is divided into 46080 208-byte cells which are chained together to make packet buffers. A white paper titled Cisco Nexus 3064PQ Switch Architecture describes buffer allocation in a single sentence:
Nothing in the documentation explains how the buffer cells are allocated to queues. The document that describe this is not public, however Cisco has given permission to share a picture that is essentially a single pane from a Powerpoint presentation. It shows the fairness rules that wrap around dynamic buffer management.