A.5.1. PCI Express* ( PCIe* ) Interface
The Intel Agilex® 7 FPGA (two F-tiles) development board is designed to fit entirely into a PC motherboard with a x16 PCI Express* slot that can accommodate a full height, 2-slot, ¾ length form factor add-in card. This interface uses the Intel Agilex® 7 FPGA's PCI Express* hard IP block, saving logic resources for the user logic application. The PCI Express* edge connector has a presence detect feature to allow the motherboard to determine if a card is installed.
The PCI Express* interface supports auto-negotiating channel width from x1 to x4 to x8 to x16 by using PCIe* Intel FPGA IP. You can also configure this board to a x1, x4, x8, or x16 interface through a DIP switch that connects the PRSTn pins for each bus width.
The PCI Express* edge connector has a connection speed of 2.5 Gbps/lane for a maximum of 40 Gbps full-duplex (Gen 1), 5.0 Gbps/lane for maximum of 80 Gbps full-duplex (Gen 2), or 8.0 Gbps/lane for a maximum of 128 Gbps full-duplex (Gen 3), and 16.0 Gbps/lane for a maximum of 256 Gbps full-duplex (Gen 4).
The power for the board can be sourced entirely from the PC host when installed into a PC motherboard with the PC’s 2x4 ATX auxiliary power connected to the 12V ATX inputs (J11) of the Intel Agilex® 7 FPGA (two F-tiles) development board. Although the board can also be powered by an externally supplied power supply for use on a lab bench, Intel® recommends that you do not power up from both supplies at the same time. Ideal diode power sharing devices have been designed into this board to prevent damages or backcurrent from one supply to the other.
The REFCLK_PCIE_EP_EDGE_P/N signal is a 100 MHz differential input that is driven from the PC motherboard onto this board through the edge connector. This signal connects directly to a Intel Agilex® 7 FPGA REFCLK input pin pair using DC coupling. This clock is terminated on the motherboard. Therefore, no on-board termination is required. This clock can have spread-spectrum properties that change its period between 9.847 ps to 10.203 ps. The I/O standard is high-speed current steering logic (HCSL).
Edge Finger pin Number | Schematic Signal Name | FPGA Pin Number | I/O Standard | Description |
---|---|---|---|---|
A11 | PCIE_3V3_EP_PERSTN | MAX10 (U5) | 3V LVCMOS | Reset |
A14 | REFCLK_PCIE_EP_EDGE_N | Clock Buffer (U26) | LVDS | Motherboard reference |
clock | ||||
A13 | REFCLK_PCIE_EP_EDGE_P | Clock Buffer (U26) | LVDS | Motherboard reference |
clock | ||||
B5 | PCIE_3V3_EP_SMBCLK | FRUID EEPROM (U2) | 1.8V | SMB clock |
B6 | PCIE_3V3_EP_SMBDAT | FRUID EEPROM (U2) | 1.8V | SMB data |
A1 | PCIE_EP_PRSNT_N | — | — | Link with DIP switch |
(SW1) | ||||
B17 | PCIE_EP_PRSNT_Nx1 | — | — | Link with DIP switch |
(SW1) | ||||
B31 | PCIE_EP_PRSNT_Nx4 | — | — | Link with DIP switch |
(SW1) | ||||
B48 | PCIE_EP_PRSNT_Nx8 | — | — | Link with DIP switch |
(SW1) | ||||
B81 | PCIE_EP_PRSNT_Nx16 | — | — | Link with DIP switch |
(SW1) | ||||
B15 | PCIE_EP_TX_N0 | AG5 | 1.4 V PCML | Receive bus |
B20 | PCIE_EP_TX_N1 | AH2 | 1.4 V PCML | Receive bus |
B24 | PCIE_EP_TX_N2 | AM2 | 1.4 V PCML | Receive bus |
B28 | PCIE_EP_TX_N3 | AT2 | 1.4 V PCML | Receive bus |
B34 | PCIE_EP_TX_N4 | AY2 | 1.4 V PCML | Receive bus |
B38 | PCIE_EP_TX_N5 | BD2 | 1.4 V PCML | Receive bus |
B42 | PCIE_EP_TX_N6 | BH2 | 1.4 V PCML | Receive bus |
B46 | PCIE_EP_TX_N7 | BM2 | 1.4 V PCML | Receive bus |
B51 | PCIE_EP_TX_N8 | BT2 | 1.4 V PCML | Receive bus |
B55 | PCIE_EP_TX_N9 | BY2 | 1.4 V PCML | Receive bus |
B59 | PCIE_EP_TX_N10 | CD2 | 1.4 V PCML | Receive bus |
B63 | PCIE_EP_TX_N11 | CH2 | 1.4 V PCML | Receive bus |
B67 | PCIE_EP_TX_N12 | CM2 | 1.4 V PCML | Receive bus |
B71 | PCIE_EP_TX_N13 | CR5 | 1.4 V PCML | Receive bus |
B75 | PCIE_EP_TX_N14 | CT2 | 1.4 V PCML | Receive bus |
B79 | PCIE_EP_TX_N5 | CW5 | 1.4 V PCML | Receive bus |
B14 | PCIE_EP_TX_P0 | AF4 | 1.4 V PCML | Receive bus |
B19 | PCIE_EP_TX_P1 | AJ1 | 1.4 V PCML | Receive bus |
B23 | PCIE_EP_TX_P2 | AN1 | 1.4 V PCML | Receive bus |
B27 | PCIE_EP_TX_P3 | AU1 | 1.4 V PCML | Receive bus |
B33 | PCIE_EP_TX_P4 | BA1 | 1.4 V PCML | Receive bus |
B37 | PCIE_EP_TX_P5 | BE1 | 1.4 V PCML | Receive bus |
B41 | PCIE_EP_TX_P6 | BJ1 | 1.4 V PCML | Receive bus |
B45 | PCIE_EP_TX_P7 | BN1 | 1.4 V PCML | Receive bus |
B50 | PCIE_EP_TX_P8 | BU1 | 1.4 V PCML | Receive bus |
B54 | PCIE_EP_TX_P9 | CA1 | 1.4 V PCML | Receive bus |
B58 | PCIE_EP_TX_P10 | CE1 | 1.4 V PCML | Receive bus |
B62 | PCIE_EP_TX_P11 | CJ1 | 1.4 V PCML | Receive bus |
B66 | PCIE_EP_TX_P12 | CN1 | 1.4 V PCML | Receive bus |
B70 | PCIE_EP_TX_P13 | CP4 | 1.4 V PCML | Receive bus |
B74 | PCIE_EP_TX_P14 | CU1 | 1.4 V PCML | Receive bus |
B78 | PCIE_EP_TX_P15 | CV4 | 1.4 V PCML | Receive bus |
A17 | PCIE_EP_RX_N0 | AL5 | 1.4 V PCML | Transmit bus |
A22 | PCIE_EP_RX_N1 | AM8 | 1.4 V PCML | Transmit bus |
A26 | PCIE_EP_RX_N2 | AR5 | 1.4 V PCML | Transmit bus |
A30 | PCIE_EP_RX_N3 | AT8 | 1.4 V PCML | Transmit bus |
A36 | PCIE_EP_RX_N4 | AW5 | 1.4 V PCML | Transmit bus |
A40 | PCIE_EP_RX_N5 | AY8 | 1.4 V PCML | Transmit bus |
A44 | PCIE_EP_RX_N6 | BC5 | 1.4 V PCML | Transmit bus |
A48 | PCIE_EP_RX_N7 | BG5 | 1.4 V PCML | Transmit bus |
A53 | PCIE_EP_RX_N8 | BL5 | 1.4 V PCML | Transmit bus |
A57 | PCIE_EP_RX_N9 | BR5 | 1.4 V PCML | Transmit bus |
A61 | PCIE_EP_RX_N10 | BW5 | 1.4 V PCML | Transmit bus |
A65 | PCIE_EP_RX_N11 | CC5 | 1.4 V PCML | Transmit bus |
A69 | PCIE_EP_RX_N12 | CG5 | 1.4 V PCML | Transmit bus |
A73 | PCIE_EP_RX_N13 | CL5 | 1.4 V PCML | Transmit bus |
A77 | PCIE_EP_RX_N14 | CM8 | 1.4 V PCML | Transmit bus |
A81 | PCIE_EP_RX_N15 | CT8 | 1.4 V PCML | Transmit bus |
A16 | PCIE_EP_RX_P0 | AK4 | 1.4 V PCML | Transmit bus |
A21 | PCIE_EP_RX_P1 | AN7 | 1.4 V PCML | Transmit bus |
A25 | PCIE_EP_RX_P2 | AP4 | 1.4 V PCML | Transmit bus |
A29 | PCIE_EP_RX_P3 | AU7 | 1.4 V PCML | Transmit bus |
A35 | PCIE_EP_RX_P4 | AV4 | 1.4 V PCML | Transmit bus |
A39 | PCIE_EP_RX_P5 | BA7 | 1.4 V PCML | Transmit bus |
A43 | PCIE_EP_RX_P6 | BB4 | 1.4 V PCML | Transmit bus |
A47 | PCIE_EP_RX_P7 | BF4 | 1.4 V PCML | Transmit bus |
A52 | PCIE_EP_RX_P8 | BK4 | 1.4 V PCML | Transmit bus |
A56 | PCIE_EP_RX_P9 | BP4 | 1.4 V PCML | Transmit bus |
A60 | PCIE_EP_RX_P10 | BV4 | 1.4 V PCML | Transmit bus |
A64 | PCIE_EP_RX_p11 | CB4 | 1.4 V PCML | Transmit bus |
A68 | PCIE_EP_RX_P12 | CF4 | 1.4 V PCML | Transmit bus |
A72 | PCIE_EP_RX_P13 | CK4 | 1.4 V PCML | Transmit bus |
A76 | PCIE_EP_RX_P14 | CN7 | 1.4 V PCML | Transmit bus |
A80 | PCIE_EP_RX_P15 | CU7 | 1.4 V PCML | Transmit bus |
B11 | PCIE_3V3_EP_WAKE | — | 3.3V | Wake Signal |
B12 | PCIE_3V3_EP_CLKREQn | — | 3.3V | Clock Request |