- PIPE_PCLK: The PIPE interface is source-synchronous. A PIPE_PCLK clock is generated by the PCIe_PHY components, used to synchronize PCIe_SS PIPE port inputs, and reflected back as the PIPE_MCLK along with the PIPE outputs. The clock is turned on/off according to the power control port. All data movement from the PIPE interface to the PCIe_SS MAC layer is synchronous to this clock.
- txclk1: Some clock division is performed over the high frequency PCIE_PHY_DIV_GCLK signal before its derivative txclk1 clock is output from the PCIe1_PHY_TX.
- txclk2: Some clock division is performed over the high frequency PCIE_PHY_DIV_GCLK signal before its derivative txclk2 clock is output from the PCIe2_PHY_TX.
- rbclk1: The PCIe1_PHY_RX output rbclk1 is the clock recovered by the PCIe1_PHY_RX on base of the serial data, received over the RXP0 and RXN0 lines from the attached to the PCIe PHY external device. The rbclk1 clock supplies the PCS1 link parallel 10-bit data reception logic.
- rbclk2: The PCIe2_PHY_RX output rbclk2 is the clock recovered by the PCIe2_PHY_RX on base of the serial data, received over the RXP1 and RXN1 lines from the attached to the PCIe PHY external device. The rbclk2 clock supplies the PCS1 or PCS2 link parallel 10-bit data reception logic.
The PIPE_PCLK clock which drives the PIPE logic is sourced by the on-chip PCIe_PHY. The PIPE interface is source-synchronous (that is, the clock is received from the PHY), used to synchronize PCIe_SS1 and PSIe_SS2 PIPE inputs, and reflected back along with the PIPE outputs as the PIPE_MCLK. The PIPE_PCLK clock is turned on/off according to the PCIe_PHY power control port. For more details, see Section 26.4.4.3.3, PCIe PHY Power Management.