Uniform Random (UNR) is a traffic pattern rather than a route. Unlike PTP, PTPL, and PTPG which pair a single master to a single slave, the UNR pattern links a single master to all slaves and the actual transaction destination changes on a transaction-by-transaction basis. The most common UNR use case is a random address access pattern across the entire address space of an HBM stack (all 16 pseudo channels). The following figure illustrates connectivity examples for PTP, PTPG, and UNR.
Figure 1. PTP vs PTPG vs UNR