1301 - PCIe: What Transaction Layer Packets (TLPs) header format is used for 64-bit addressing?
PCIe supports both 32-bit and 64 bit addressing. For 32-bit addressing a 3-DW header is used, containing just 32-bits of address info. For 64-bit addressing, a 4-DW header is used, with the extra DW holding the additional 32-bits of addressing.
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7316 - All Nexus / PCIe: PCIe assignment of 2GB BAR size for 64-bit BAR addressing.
Description: There is a known bug in the PCIe IP GUI wherein the 64-bit BAR addressing requires that the BAR size be >/= 4 GB only. Solution: As a workaround, the user can write the Resizable BAR Capability Configuration (0,1,2,3,4,5) using LMMI or ...
6934 - PCIe for Nexus FPGA: How to write the Link Layer Configuration Space Registers on PCIe device?
Solution: 1. Defining the usr_lmmi_offset_i [16:2] a. usr_lmmi_offset_i [16] == selects between Link Layer or PHY register access b. usr_lmmi_offset [15:2] == refer to FPGA-IPUG-02126 à word aligned offset of base + offset address 2. Write “1’b0” on ...
7560 - LatticeECP3\ECP5: What is the PCIe Advanced Error Reporting header format of err_tlp_header[127:0]?
Description: The 128-bit AER bus of err_tlp_header[127:0] Header Word 0 starts at [127:96]. The interpretation is as below: [127:96] - Header Word 0 (Fmt, Type, TC, TD, EP, Attr, Length) [95:64] - Header Word 1 (Requester ID, Tag, Last DW BE, First ...
3601 - LatticeECP3: Why do I need to indicate the Header credits while performing memory reads for the Lattice PCIe IP?
PCIe protocol classifies all transactions in two types: - Posted - Non-posted In posted transactions, the Requester sends the TLP packet to the Completer, and the Completer will not send any completion TLP packet back to the Requester. So, Memory ...
1104 - LatticeECP3/ECP5: What are Link CRC (LCRC) and End to End Cyclic Redundancy Check (ECRC), and how are they used?
Description:Peripheral Component Interconnect Express (PCIe) provides two different CRC tests for the transfer of data. The LCRC, or Link CRC, is handled in the data link layer. The optional ECRC, or endpoint CRC, is handled in the transaction layer. ...