Intel® Stratix® 10 Device Family Pin Connection Guidelines

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ID 683028
Date 6/25/2022
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Intel® Stratix® 10 P-Tile Transceiver Pins

Note: Intel recommends that you create an Intel® Quartus® Prime design, enter your device I/O assignments, and compile the design. The Intel® Quartus® Prime software will check your pin connections according to I/O assignment and placement rules. The rules differ from one device to another based on device density, package, I/O assignments, voltage assignments, and other factors that are not fully described in this document or the device handbook.
Table 21.   Intel® Stratix® 10 P-Tile Transceiver Pins
Pin Name Pin Functions Pin Description Connection Guidelines
IO_AUX_RREF[10, 11, 12, 20, 21, 22]_P Input Reference resistor for P-tile transceivers.

Connect each IO_AUX_RREF pin to a 2.8KΩ resistor (±1%) to GND.

In the PCB layout, the trace from this pin to the resistor needs to be routed such that it avoids any aggressor signals.

If this tile is unused, you must connect the 2.8KΩ resistor between this pin and GND.

U[10, 11, 12, 20, 21, 22]_P_IO_RESREF_0 Input Transceiver reference resistor connection for PMA circuitry to provide termination for calibration.

Connect each pin to 169Ω (±1%, 100 ppm/C) precision resistor to GND if the UltraPath Interconnect (UPI)/ PCIe* is 85Ω impedance.

Place this resistor very close to the IO_RESREF pin. Avoid routing any noisy signals next to this reference resistor or its traces. Tie resistor to GND plane through a via placed very close to the reference resistor.

External reference resistor parasitic capacitance load must be less than 6.5pF.

I_PIN_PERST_N[10, 11, 12, 20, 21, 22]_P Input PCI Express* ( PCIe* ) Platform reset pin.

In a PCI Express* ( PCIe* ) adapter card implementation, connect the PCIe* nPERST signal from the PCIe* edge connector to each P-tile transceiver bank I_PIN_PERST_N input.

Use a level translator to fan out and change the 3.3V open-drain nPERST signal from the PCIe* connector to the 1.8V I_PIN_PERST_N input of each P-tile transceiver that is used on the board.

Provide a 1.8V pull-up resistor to the I_PIN_PERST_N input as the nPERST signal from the PCIe* connector is an open-drain signal. You must pull up the 3.3V PCIe* nPERST signal on the adapter card.

For the UltraPath Interconnect (UPI) mode, contact Intel® for guidance.

If the tile is unused, tie to GND.

GXP[L, R][10, 11, 12][A, B, C]_TX_CH[0:19][p,n] Output

Differential-based transmitter pins, specific to P-tile transceivers on the left (L) side and right (R) side of the device.

These pins support NRZ encoding up to 16Gbps.

Connection guidelines for the PCIe* and UltraPath Interconnect (UPI) modes are as follow:

  • PCIe* mode—TX pins must be AC coupled. Capacitor values range from 176nF to 256nF per PCIe* Gen 4 specification.
  • UPI mode—TX pins must be DC coupled.

When these pins are not used, they can be floating.

GXP[L, R][10, 11, 12][A, B, C]_RX_CH[0:19][p,n] Input

Differential-based receiver pins, specific to P-tile transceivers on the left (L) side and right (R) side of the device.

These pins support NRZ encoding up to 16Gbps.

When these pins are not used, they must be tied via a 1kΩ pull-down resistor to GND.
REFCLK_GXP[L, R][10, 11, 12][A, B, C]_CH[0, 2][p,n] Input Standard PCIe* HCSL reference clock input pins, specific to P-tile transceivers on the left (L) side and right (R) side of the device.

For the HCSL I/O standard, it only supports DC coupling. In the PCIe* configuration, DC-coupling is allowed on the REFCLK if the selected REFCLK I/O standard is the HCSL I/O standard.

Connect each unused REFCLK_GXP pin to GND plane directly on its own via. Do not share vias when connecting to GND.

You must connect a 100MHz reference clock to both reference clock inputs for x16 and 4x4 modes. These reference clocks must be derived from the same clock source. A fan-out buffer can be used but must meet a ±300ppm requirement. For 2x8 modes, you can connect both reference clock inputs to the same clock source or connect to two independent clock sources.

If the P-tile is completely unused, tie both REFCLK inputs to GND.

Unused reference clock pins must be tied to 1kΩ pull-down resistor to GND.

S_STRAP[10,11,12,20,21,22]_P Input Internal strap pins.

For PCIe* only system, connect to GND.

For UltraPath Interconnect (UPI) applications, connect the strap pins as follows:

  • For a two socket (2S) Intel® Xeon® system, connect to GND.
  • For a four socket (4S) Intel® Xeon® system, pull up through a 10kΩ resistor to VCCCLK_GXP (1.8V).

For the UltraPath Interconnect (UPI) mode, contact Intel® for guidance.

NODE_ID[0,1][10,11,12,20,21,22]_P Input Internal node ID pins.

For PCIe* only system, connect both ID pins to GND.

For UltraPath Interconnect (UPI) applications, connect these ID pins to the corresponding CPU ID of the UPI interface.

  • NODE_ID0 connects to CPU0.
  • NODE_ID1 connects to CPU1.

If the tile is unused, tie to GND.

For the UltraPath Interconnect (UPI) mode, contact Intel® for guidance.

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