2.2.11. PLL Mode

E-Tile Transceiver PHY User Guide

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Date 4/01/2024

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2.2.11. PLL Mode

PLL mode is a configuration of the E-tile transceiver Native PHY IP core that configures the E-tile transceiver as a PLL. It is used for external EMIB clocking configurations (see the use case in Four 25 Gbps PMA Direct Channel (with FEC) within a Single FEC Block ). It does not support dynamic reconfiguring between PLL and other Transceiver Configuration Rules.

After a transceiver channel is used in PLL mode, it cannot be used for a usual transceiver operation. You have to connect the output of the Native PHY IP core in PLL mode to the respective transceiver input.

Figure 42. E-Tile Native PHY IP PLL Mode

Table 34. E-Tile Native PHY IP PLL Mode Options
Parameter	Value	Description
Number of reference clock inputs	1, 2, 3, 4, 5	Specifies the desired number of reference clocks. The Native PHY IP core presents up to five clock inputs.
Initial TX reference clock input selection	Based on the number of reference clock input	Specifies the initially selected PLL reference clock input. This indicates the starting clock input selection used for this configuration when dynamically switching between multiple TX reference clock inputs.
PLL output clock frequency	100 - 1000 MHz	Specifies the PLL output frequency in units of MHz.
PLL output 2 clock frequency	Output from the PLL. `pll_clkout2` frequency = 0.5 * `pll_clkout1` frequency	Specifies the PLL output frequency for output 2 in units of MHz.
PLL reference clock frequency	Refer to the Device Data Sheet.	Selects the reference clock frequency for the PLL.

PLL output clock (pll_clkout) and PLL output 2 clock (pll_clkout2) are asynchronous (no phase relationship) to each other and to any other clock output from the Native PHY IP. You need to take the required precautions to do any data transfers between the two clocks.

Table 35. E-Tile Native PHY IP PLL Ports
Port Name	Direction	Clock Domain	Width	Description
`pll_refclk0` `pll_refclk1` `pll_refclk2` `pll_refclk3` `pll_refclk4`	Input	N/A	1 bit for each channel	Reference clock for the PLL.
`pll_locked`	Output	`reconfig_clk`	1 bit for each channel	Locked status signal of the PLL. When you use the PLL channel as a clock source to the transceiver channel through external EMIB clocking: Wait until `pll_locked` from the PLL channel is asserted before deasserting the transceiver channel reset after device configuration. If `pll_locked` from the PLL channel is deasserted at any time, hold the respective transceiver channels in reset until `pll_locked` is reasserted.
`tx_serial_data`	Output	N/A	1 bit for each channel	The `tx_serial_data` port is only used to assign the location of the PLL channel. It is not an active port for transmitting data.¹⁰
`pll_clkout1` `pll_clkout2`	Output	N/A	1 bit for each channel	Output from the PLL. `pll_clkout2` frequency = 0.5 * `pll_clkout1` frequency

¹⁰ If you are targeting a channel that is not bonded out on a device package (for example, a PTP channel), you can leave tx_serial_data unconnected and make the location assignment to the HSSIXCVR component of the channel. For example:

set_location_assignment HSSIXCVR_4T9A18 -to <path>|xcvr_native_s10_etile_0|g_xcvr_native_insts[0].ct3_xcvr_native_inst|inst_ct3_xcvr_channel|inst_ct3_hssi_xcvr

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E-Tile Transceiver PHY User Guide

2.2.11. PLL Mode