SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Table 26-49 represents module pins and their corresponding signal names at the device level, and also specifies their links to functions.
Module Pin Name | Device-Level Signal Name | I/O(1) | Description | Pin Reset Value(2) |
---|---|---|---|---|
TXP0 | pcie_txp0 | O | TXP output of the PCIe Port 0 PHY differential transmission line | 0 |
TXN0 | pcie_txn0 | O | TXN output of the PCIe Port 0 PHY differential transmission line | 0 |
RXP0 | pcie_rxp0 | I | RXP input of the PCIe Port 0 PHY differential reception line | HiZ |
RXN0 | pcie_rxn0 | I | RXN input of the PCIe Port 0 PHY differential reception line | HiZ |
TXP1 | pcie_txp1 | O | TXP output of the PCIe Port 1 PHY differential transmission line | 0 |
TXN1 | pcie_txn1 | O | TXN output of the PCIe Port 1 PHY differential transmission line | 0 |
RXP1 | pcie_rxp1 | I | RXP input of the PCIe Port 1 PHY differential reception line | HiZ |
RXN1 | pcie_rxn1 | I | RXN input of the PCIe Port 1 PHY differential reception line | HiZ |
LJCB_CLKP | ljcb_clkp | I/O | Differential input/output of reference clock buffer (positive) | HiZ |
LJCB_CLKN | ljcb_clkn | I/O | Differential input/output of reference clock buffer (negative) | HiZ |
To swap polarity of the PHY_TX serializer outputs - TXP and TXN such that, TXP becomes the negative and TXN becomes the positive terminal, user software has to assert bit PCIEPHYTX_FUNC_CONFIG_REG[31] MEM_INVPAIR to 0b1.
To swap polarity of the PHY_RX de-serializer inputs - RXP and RXN, such that, RXP becomes the negative and RXN becomes the positive terminal, user software has to:
For more information on the necessary SCP register access configuration refer to Section 26.4.6, PCIe PHY Subsystem Register Manual and Section 26.4.5, PCIePHY Subsystem Low-Level Programming Model.
Figure 26-16 shows module pin signals mapping to PCIe PHY signals visible at the device pad level.
The path from module pin to device pad(s) is defined at the device I/O logic level. The I/O logic maps the module signals to the different pads of the device and can be programmed in the control module registers. For more information, see Pad Configuration Registers and Control Module Register Manual in Control Module.