5.9.1. PCIe
The PCIe* RC interface on the development board supports auto-negotiating channel width from x1 to x8 as well as the connection speed of Gen3 at 8 Gbps/lane.
The PCIe* end point interface is connected to the FMCB slot. A special PCIe* -FMC cable (HDR-181157-01-PCIEC) made by SAMTEC must be plugged into the FMCB slot for the PCIe* EP application.
For the PCIe* RC application, the PCIE_REFCLK_P/N signal is a 100 MHz differential input that is driven to the daughtercard through the PCIe* edge connector. This signal connects directly to a Intel® Arria® 10 SoC REFCLK input pin pair using DC coupling. The I/O standard is High-Speed Current Steering Logic (HCSL).
The PCIe* edge connector also has a presence detect feature for the motherboard to determine if a card is installed.
| Intel® Arria® 10 SoC Pin Name | Schematic Signal Name | Direction | Description |
|---|---|---|---|
| Y38 | PCIE_TX_N7 | Output | PCIe* RC Channel 7 Transmitter |
| Y39 | PCIE_TX_P7 | Output | PCIe* RC Channel 7 Transmitter |
| Y34 | PCIE_RX_N7 | Input | PCIe* RC Channel 7 Receiver |
| Y35 | PCIE_RX_P7 | Input | PCIe* RC Channel 7 Receiver |
| AA36 | PCIE_TX_N6 | Output | PCIe* RC Channel 6 Transmitter |
| AA37 | PCIE_TX_P6 | Output | PCIe* RC Channel 6 Transmitter |
| AA32 | PCIE_RX_N6 | Input | PCIe* RC Channel 6 Receiver |
| AA33 | PCIE_RX_P6 | Input | PCIe* RC Channel 6 Receiver |
| AB38 | PCIE_TX_N5 | Output | PCIe* RC Channel 5 Transmitter |
| AB39 | PCIE_TX_P5 | Output | PCIe* RC Channel 5 Transmitter |
| AB34 | PCIE_RX_N5 | Input | PCIe* RC Channel 5 Receiver |
| AB35 | PCIE_RX_P5 | Input | PCIe* RC Channel 5 Receiver |
| AC36 | PCIE_TX_N4 | Output | PCIe* RC Channel 4 Transmitter |
| AC37 | PCIE_TX_P4 | Output | PCIe* RC Channel 4 Transmitter |
| AB30 | PCIE_RX_N4 | Input | PCIe* RC Channel 4 Receiver |
| AB31 | PCIE_RX_P4 | Input | PCIe* RC Channel 4 Receiver |
| AD38 | PCIE_TX_N3 | Output | PCIe* RC Channel 3 Transmitter |
| AD39 | PCIE_TX_P3 | Output | PCIe* RC Channel 3 Transmitter |
| AC32 | PCIE_RX_N3 | Input | PCIe* RC Channel 3 Receiver |
| AC33 | PCIE_RX_P3 | Input | PCIe* RC Channel 3 Receiver |
| AE36 | PCIE_TX_N2 | Output | PCIe* RC Channel 2 Transmitter |
| AE37 | PCIE_TX_P2 | Output | PCIe* RC Channel 2 Transmitter |
| AD34 | PCIE_RX_N2 | Input | PCIe* RC Channel 2 Receiver |
| AD35 | PCIE_RX_P2 | Input | PCIe* RC Channel 2 Receiver |
| AE28 | - | Input | Pull down to Ground, no use |
| AE29 | - | Input | Pull down to Ground, no use |