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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PCIe DMA in Ring Buffer Operation mode unable to be stopped
Title: PCIe DMA in Ring Buffer Operation Mode Cannot Be Stopped Unexpectedly Issue Description: When the PCIe DMA is configured to operate in Ring Buffer DMA mode for continuous transfers, the DMA operation cannot be stopped unexpectedly. If a device ...
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 ...