Translations Between PCIe UIO and PCIe Non-UIO Transactions for Heterogeneous Interconnect Environments

A system for translating between Peripheral Component Interconnect Express (PCIe) Transaction Layer Packets (TLPs), comprising:

• a first interface configured to communicate with a first entity;
• a second interface configured to communicate with a second entity;
• and
• a computer coupled between the first interface and the second interface, the computer configured to:
• receive, via the first interface, a first PCIe Memory Read request comprising a first address and a first Tag;
• translate the first PCIe Memory Read request to a second PCIe Memory Read request comprising a second address and a second Tag;
• wherein one of the first PCIe Memory Read request and the second PCIe Memory Read request comprises an Unordered Input/Output (UIO) Memory Read (UIOMRd) request, and the other comprises a non-UIO Memory Read (MRd) request;
• send, via the second interface, the second PCIe Memory Read request;
• receive, via the second interface, a second PCIe Completion comprising the second Tag and a data payload;
• translate the second PCIe Completion to a first PCIe Completion comprising the first Tag and the data payload;
• and
• send, via the first interface, the first PCIe Completion.

A method for enabling Unordered Input/Output (UIO) transactions over a split flit-mode/non-flit-mode path, comprising:

• receiving, via a first interface operating in a first data stream mode, a first Peripheral Component Interconnect Express (PCIe) Transaction Layer Packet (TLP);
• translating, by a computer, the first PCIe TLP to a second PCIe TLP, wherein the first PCIe TLP comprises a UIO TLP and the second PCIe TLP comprises a non-UIO TLP, or wherein the first PCIe TLP comprises a non-UIO TLP and the second PCIe TLP comprises a UIO TLP;
• and
• sending, via a second interface operating in a second data stream mode different from the first data stream mode, the second PCIe TLP;
• wherein one of the first data stream mode and the second data stream mode comprises Flit Mode (FM), and the other comprises Non-Flit Mode (NFM).

A system for enabling Unordered Input/Output (UIO) transactions over a split flit-mode/non-flit-mode path, comprising:

• a first interface configured to operate in a first data stream mode and to communicate with a first entity;
• a second interface configured to operate in a second data stream mode different from the first data stream mode and to communicate with a second entity;
• wherein one of the first data stream mode and the second data stream mode comprises Flit Mode (FM), and the other comprises Non-Flit Mode (NFM);
• and
• a computer coupled between the first interface and the second interface, the computer configured to:
• receive, via the first interface, a first Peripheral Component Interconnect Express (PCIe) Transaction Layer Packet (TLP);
• translate the first PCIe TLP to a second PCIe TLP, wherein the first PCIe TLP comprises a UIO TLP and the second PCIe TLP comprises a non-UIO TLP, or wherein the first PCIe TLP comprises a non-UIO TLP and the second PCIe TLP comprises a UIO TLP;
• and
• send, via the second interface, the second PCIe TLP.