Visible to Intel only — GUID: jhp1681146376811
Ixiasoft
Visible to Intel only — GUID: jhp1681146376811
Ixiasoft
1.5.2. R-Tile Transceiver Pins
Pin Name | Pin Functions | Pin Description | Connection Guidelines |
---|---|---|---|
IO_RCOMP_0_P_GXR | Input | External biasing resistor for R-Tile. | Connect a 150-Ω 1% resistor between the GXR_RCOMP_N_0 pin and GXR_RCOMP_P_0 pin of each R-Tile bank. RCOMP_P + RCOMP_N total trace routing (package and board) resistance is less than 0.500 Ω. In the PCB layout, do not route traces next to high speed clock/data aggressors. You are required to keep the maximum capacitance on RCOMP_P less than 5.0 pF. If this tile is unused, leave these pins floating. |
IO_RCOMP_0_N_GXR | |||
I_PIN_PERST_N_GXR | Input | PCI Express* ( PCIe* ) Platform reset pin. | In a PCIe* adapter card implementation, connect the PCIe* nPERST signal from the PCIe* edge connector to each R-Tile transceiver bank I_PIN_PERST_N input. Use a level translator to fan out and change the 3.3-V open- drain nPERST signal from the PCIe* connector to the 1.0-V I_PIN_PERST_N input of each R-Tile transceiver that is used on the board. Provide a 1.0-V 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 3.3-V PCIe* nPERST signal on the adapter card. If the tile is unused, tie to GND. In cases where two independent clock sources are used for 2x8 bifurcation mode, ensure that I_PIN_PERST_N is deasserted high after both reference clocks are stable. |
REFCLK_GXR[R,L][14A,14C,15A,15C]_CH[0,1]P | Input | Standard PCIe* High Speed Current Steering Logic (HCSL) reference clock input pins, specific to the R-Tile transceivers on the left (L) side or right (R) side of the device. For more information about the supported pins, refer to the device pin-out file. |
It supports HCSL I/O standard only, must be DC coupled. You must connect a 100-MHz ±100 ppm 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 ±100 ppm requirement for Gen 5. |
REFCLK_GXR[R,L] [14A,14C,15A,15C]_CH[0,1]N | For 2x8 modes, you can connect both reference clock inputs to the same clock source or connect to two independent clock sources. Leave these pins floating if unused. |
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GXR[R,L] [14A,14C,15A,15C]_RX_C H[0:15]P | Input | Transceiver receiver pins, specific to the R-Tile transceivers on the left (L) side or right (R) side of the device. For PCIe* Gen 5 mode, use the lower 16 bits [15:0]. These pins also support NRZ encoding up to 32 Gbps. For more information about the supported pins, refer to the device pin-out file. |
Leave these pins floating if unused. |
GXR[R,L] [14A,14C,15A,15C]_RX_C H[0:15]N | |||
GXR[R,L] [14A,14C,15A,15C]_TX_C H[0:15]P | Output | Transceiver transmitter pins, specific to the R-Tile transceivers on the left (L) side or right (R) side of the device. For PCIe* Gen 5 mode, use the lower 16 bits [15:0]. These pins also support NRZ encoding up to 32 Gbps. For more information about the supported pins, refer to the device pin-out file. |
Transmitter pins must be AC coupled. Leave these pins floating if unused. |
GXR[R,L] [14A,14C,15A,15C]_TX_C H[0:15]N |