Visible to Intel only — GUID: nik1398984134499
Ixiasoft
Visible to Intel only — GUID: nik1398984134499
Ixiasoft
9.8. PHY for PCIe (PIPE) Clocks
Signal Name | Direction | Description |
---|---|---|
pll_ref_clk | Input | This is the 100 MHz input reference clock source for the PHY TX and RX PLL. You can optionally provide a 125 MHz input reference clock by setting the PLL reference clock frequency parameter to 125 MHz as described in PHY IP Core for PCI Express General Options. |
fixedclk | Input | A 100 MHz or 125 MHz clock used for the receiver detect circuitry. This clock can be derived from pll_ref_clk. |
pipe_pclk | Output | Generated in the PMA and driven to the MAC PHY interface. All data and status signals are synchronous to pipe_pclk. This clock has the following frequencies:
|
The following table lists the pipe_pclk frequencies for all available PCS interface widths. Doubling the FPGA transceiver width haves the required frequency.
Capability | FPGA Transceiver Width | Gen1 | Gen2 | Gen3 |
---|---|---|---|---|
Gen1 only | 8 bits | 250 MHz | — | — |
16 bits | 125 MHz | — | — | |
Gen2 capable | 16 bits | 125 MHz | 250 MHz | — |
Gen3 capable | 32 bits | 62.5 MHz | 125 MHz | 250 MHz |