Write Ordering - Write Ordering - 1.1 English - PG313

The NoC generally uses the Single Slave per ID (SSID) rule for write requests. However, the HBM_NMU implementation offers the following three types of write ordering:

Strict

This type of write request must follow the SSID rule. It ensures the NMU receives the write response from one NSU before issuing a new write request to another NSU. This applies when both the requests have the same AXI ID and a different destID.

Relaxed

This rule requires the write requests with the same AXI ID to have their responses returned in the same order as the requests. However, the NMU does not block a new write request. The request is sent out immediately.

Doorbell

This write ordering rule flushes all previous relaxed write order requests from the same AXI ID. It follows the SSID rule for other types of previous write order requests (strict/doorbell). It ensures the NMU receives the write response for one NSU before issuing a new write request to another NSU. This applies when both the requests have the same AXI ID and different destID.