NoC Architecture - 1.0 English

Versal ACAP Programmable Network on Chip and Integrated Memory Controller LogiCORE IP Product Guide (PG313)

Document ID
PG313
Release Date
2022-12-14
Version
1.0 English

The following figure is a representation of the NoC. It shows how various elements are connected to construct a NoC system and how the NoC is incorporated within the device.

Figure 1. NoC Block Diagram

As shown, the NoC system is a large-scale interconnection of instances of NoC master units (NMUs), NoC slave units (NSUs), and NoC packet switches (NPSs), each controlled and programmed from a NoC programming interface (NPI).

For multi-SLR devices, NoC inter-die bridges (NIDBs) are added to enable Stacked Silicon Interconnect Technology (SSIT), as shown below.

Figure 2. Multi-SLR NoC Block Diagram

For Versal® HBM series devices, the NoC architecture for the top Super Logic Region (SLR) has modified Horizontal NoC, packet switches, and NSUs, optimized for HBM traffic.

Figure 3. NoC HBM2e

The Versal® ACAP Programmable NoC is statically routed by Vivado® software at design time. That is, the assignment of NoC ingress and egress points to specific NMUs and NSUs and the routing paths to implement connections between ingress and egress are computed at design time by the NoC compiler, part of the Vivado® Design Suite. The NoC compiler considers the connectivity of the design and quality of service constraints supplied by the designer to solve for a globally optimal solution. This solution is then expressed as configuration data in the final application PDI files.

The NoC and DDRMC system must be configured/programmed from the NPI at early boot and be ready before NoC data paths or DDRMC are used. The NPI programs NoC and DDRMC registers that define the routing table, rate modulation, QoS configuration, and timing parameters. Programming of the NoC and DDRMC from the NPI requires no user intervention, it is fully automated and executed by the platform management controller (PMC). For more information about boot and configuration refer to the Versal ACAP Technical Reference Manual (AM011).