Features - Features - 1.1 English - PG313

The NoC includes a series of interconnected horizontal (HNoC) and vertical (VNoC) paths. It uses customizable, hardware-implemented components that you can configure to meet timing, speed, and logic utilization requirements. The NoC supports the following features:

• PL to PL communication.
• PL to CIPS communication.
• CIPS to PL communication.
• CIPS to DDR memory communication.
• CIPS to AI Engine communication.
• High bandwidth data transport.
• Supports standard AXI4 interface to the NoC. AXI4-Lite support requires a soft bridge.
• Supports clock domain crossing.
• Internal register programming interconnect for programming NoC registers.
• Multiple routing options:
  • Based on physical address.
  • Based on destination interface.
  • Virtual address support.
• Inter-die connectivity with hardened SSIT bridging.
• Transports bit-stream from source die PMC to PMC in destination die in SSIT configurations.
• Programmable routing tables for load balancing and deadlock avoidance.
• Debug and performance analysis features.
• End-to-end data protection for Reliability, Availability, Serviceability (RAS).
• Virtual channels and quality of service (QoS) throughout the NoC. These effectively manage transactions and balance competing latency and bandwidth requirements of each traffic stream:
  • Using ingress rate control, the NoC master unit (NMU) can control the injection rate of packets into the NoC.
    Note: The current release does not support NMU injection rate control..
  • There are eight virtual channels on each physical link. Each AXI request and response occupies a separate Virtual Channel:
    • Each ingress AXI interface (at NMU) can be statically programmed to select the virtual channel it maps to.
    • Virtual channel mapping can be re-programmed (the NMU must be quiesced first).
    • All AXI QoS values are optionally carried through the NoC.

• The NoC connection hardware (or access points) use a master-slave, memory mapped configuration. The most basic connection over the NoC consists of a single master connected to a single slave using a single packet switch. Using this approach, the master takes the AXI information and packetizes it for transport over the NoC to the slave, via packet switches. The slave decomposes the packets back to AXI information delivered to the connected back-end design. To achieve this, a NoC access point manages all clock domain crossing, switching, and data buffering between the AXI and NoC side and vice versa.

• Error-Correcting Code (ECC) is supported for memory mapped transactions (ECC of AXI4-Stream is not supported).

For all AXI features, refer to the Vivado Design Suite: AXI Reference Guide (UG1037).

Each AMD Versal™ device provides dedicated, hardware-constructed DDR memory controllers integrated into the NoC structure. The DDR memory controller interface contains four dedicated NSU controllers. The NoC IP Wizard configures the DDR memory controllers. To make optimal use of the available NoC features, the NoC structure provides support for interleaving across multiple physical DDR controllers (two or four).

• The NMU handles chopping and ordering needed to support DDR memory controller interleaving.
• The NMU handles transactions that target interleaved DDR memory controllers as follows:
  • The NMU chops the transaction into smaller packets to align with the interleave granule and memory space of each physical controller.
  • The NMU addresses each sub-packet separately to align to the correct physical DDR interface.
  • Responses are re-assembled at the NMU and returned to the attached master.