3.1.3.2. fPLL IP Core

Arria® 10 Transceiver PHY User Guide

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Date 4/01/2024

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3.1.3.2. fPLL IP Core

Table 234. fPLL IP Core Configuration Options, Parameters, and Settings
Parameters	Range	Description
fPLL Mode	Core Cascade Source Transceiver	Specifies the fPLL mode of operation. Select Core to use fPLL as a general purpose PLL to drive the FPGA core clock network. Select Cascade Source to connect an fPLL to another PLL as a cascading source. Select Transceiver to use an fPLL as a transmit PLL for the transceiver block.
Protocol Mode	Basic PCIe* Gen1 PCIe Gen2 SDI_direct SATA TX	Governs the internal setting rules for the VCO. This parameter is not a preset. You must set all parameters for your protocol.
Enable fractional mode	On/Off	Enables the fractional frequency mode. This enables the PLL to output frequencies which are not integral multiples of the input reference clock.
Enable manual counter configuration	On/Off	Selecting this option allows you to manually specify M, N, C and L counter values.
Enable clklow and fref ports ⁵⁵	On/Off	Enables fref and clklow clock ports for external lock detector. In Transceiver mode when "enable fractional mode" and "SDI_direct" prot_mode are selected, pll_locked port is not available and user can create external lock detector using fref and clklow clock ports.
Desired Reference clock frequency	Refer to the GUI	Specifies the desired PLL input reference clock frequency.
Actual reference clock frequency	Read-only	Displays the actual PLL input reference clock frequency.
Number of PLL reference clocks	1 to 5	Specify the number of input reference clocks for the fPLL.
Selected reference clock source	0 to 4	Specifies the initially selected reference clock input to the fPLL.
Bandwidth	Low Medium High	Specifies the VCO bandwidth. Higher bandwidth reduces PLL lock time, at the expense of decreased jitter rejection.
Operation mode	Direct Feedback compensation bonding	Specifies the feedback operation mode for the fPLL.
Multiply factor (M-counter)	8 to 127 (integer mode) 11 to 123 (fractional mode)	Specifies the multiply factor (M-counter).
Divide factor (N-counter)	1 to 31	Specifies the divide factor (N-counter).
Divide factor (L-counter)	1, 2, 4, 8	Specifies the divide factor (L-counter).
Divide factor (K-counter)	User defined	Specifies the divide factor (K-counter).
PLL output frequency	Read-only	Displays the target output frequency for the PLL.
PLL Datarate	Read-only	Displays the PLL datarate.

Table 235. fPLL—Master Clock Generation Block Parameters and Settings
Parameters	Range	Description
Include Master Clock Generation Block	On/Off	When enabled, includes a master CGB as a part of the fPLL IP core. The PLL output drives the master CGB. This is used for x6/xN bonded and non-bonded modes.
Clock division factor	1, 2, 4, 8	Divides the master CGB clock input before generating bonding clocks.
Enable x6/xN non-bonded high-speed clock output port	On/Off	Enables the master CGB serial clock output port used for x6/xN non-bonded modes.
Enable PCIe clock switch interface	On/Off	Enables the control signals used for PCIe clock switch circuitry.
MCGB input clock frequency	Read only	Displays the master CGB’s required input clock frequency. You cannot set this parameter.
MCGB output data rate	Read only	Displays the master CGB’s output data rate. You cannot set this parameter. This value is calculated based on MCGB input clock frequency and MCGB clock division factor.
Enable bonding clock output ports	On/Off	Enables the `tx_bonding_clocks` output ports of the Master CGB used for channel bonding. You must enable this parameter for bonded designs.
Enable feedback compensation bonding	On/Off	Enables the feedback output path of the master CGB used for feedback compensation bonding. When enabled, the feedback connections are automatically handled by the PLL IP.
PMA interface width	8, 10, 16, 20, 32, 40, 64	Specifies the PMA-PCS interface width. Match this value with the PMA interface width selected for the Native PHY IP core. You must select a proper value for generating bonding clocks for the Native PHY IP core.

Table 236. fPLL—Dynamic Reconfiguration Parameters and Settings
Parameter	Range	Description
Enable dynamic reconfiguration	On/Off	Enables the PLL reconfiguration interface. Enables the simulation models and adds more ports for reconfiguration.
Enable Native PHY Debug Master Endpoint	On/Off	When you turn this option ON, the transceiver PLL IP core includes an embedded Native PHY Debug Master Endpoint (NPDME) that connects internally to the Avalon® memory-mapped interface slave interface for dynamic reconfiguration. The NPDME can access the reconfiguration space of the transceiver. It can perform certain test and debug functions via JTAG using the System Console. Refer to the Reconfiguration Interface and Dynamic Reconfiguration chapter for more details.
Separate reconfig_waitrequest from the status of AVMM arbitration with PreSICE	On/Off	When enabled, the `reconfig_waitrequest` does not indicate the status of Avalon® memory-mapped interface arbitration with PreSICE. The Avalon® memory-mapped interface arbitration status is reflected in a soft status register bit. (Only available if "Enable control and status registers feature" is enabled).
Enable capability registers	On/Off	Enables capability registers that provide high-level information about the fPLL's configuration.
Set user-defined IP identifier		Sets a user-defined numeric identifier that can be read from the `user_identifier` offset when the capability registers are enabled.
Enable control and status registers	On/Off	Enables soft registers for reading status signals and writing control signals on the PLL interface through the embedded debug logic.
Configuration file prefix		Enter the prefix name for the configuration files to be generated.
Generate SystemVerilog package file	On/Off	Generates a SystemVerilog package file containing all relevant parameters used by the PLL.
Generate C header file	On/Off	Generates a C header file containing all relevant parameters used by the PLL.
Generate MIF (Memory Initialize File)	On/Off	Generates a MIF file that contains the current configuration. Use this option for reconfiguration purposes in order to switch between different PLL configurations.

Table 237. Clock Switchover (between Dynamic Reconfiguration and General Options)
Clock Switchover Parameter	Range	Description
Create a second input clock pllrefclk1	On/Off	Turn on this parameter to have a backup clock attached to your fPLL that can switch with your original reference clock
Second Reference Clock Frequency	User Defined	Specifies the second reference clock frequency for fPLL
Switchover Mode	Automatic Switchover Manual Switchover Automatic Switchover with Manual Override	Specifies how Input frequency switchover is handled. Automatic Switchover uses built in circuitry to detect if one of your input clocks has stopped toggling and switch to the other. Manual Switchover creates an `EXTSWITCH` signal which can be used to manually switch the clock by asserting high for at least 3 cycles. Automatic Switchover with Manual Override acts as Automatic Switchover until the `EXTSWITCH` goes high, in which case it switches and ignores any automatic switches as long as `EXTSWITCH` stays high.
Switchover Delays	0 to 7	Adds a specific amount of cycle delay to the Switchover Process.
Create an active_clk signal to indicate the input clock in use	On/Off	This parameter creates an output that indicates which input clock is currently in use by the PLL. Low indicates `refclk`, High indicates refclk1.
Create a clkbad signal for each of the input clocks	On/Off	This parameter creates two `clkbad` outputs, one for each input clock. Low indicates the `CLK` is working, High indicates the `CLK` is not working.

Table 238. fPLL - Generation Options
Parameter	Direction	Description
Generates parameter documentation file	On/Off	Generates a .csv file that contains descriptions of all the fPLL parameters and values.

Table 239. fPLL IP Core Ports
Port	Direction	Clock Domain	Description
pll_powerdown	input	Asynchronous	Resets the PLL when asserted high. Needs to be connected to a dynamically controlled signal (the Transceiver PHY Reset Controller pll_powerdown output if using this Intel FPGA IP).
pll_refclk0	input	N/A	Reference clock input port 0. There are five reference clock input ports. The number of reference clock ports available depends on the Number of PLL reference clocks parameter.
pll_refclk1	input	N/A	Reference clock input port 1.
pll_refclk2	input	N/A	Reference clock input port 2.
pll_refclk3	input	N/A	Reference clock input port 3.
pll_refclk4	input	N/A	Reference clock input port 4.
tx_serial_clk	output	N/A	High speed serial clock output port for GX channels. Represents the x1 clock network.
pll_locked	output	Asynchronous	Active high status signal which indicates if PLL is locked.
hssi_pll_cascade_clk	output	N/A	fPLL cascade clock output port
pll_pcie_clk	output	N/A	Used for PCIe.
reconfig_clk0	input	N/A	Optional Avalon® interface clock. Used for PLL reconfiguration.
reconfig_reset0	input	reconfig_clk0	Used to reset the Avalon® interface. Asynchronous to assertion and synchronous to deassertion.
reconfig_write0	input	reconfig_clk0	Active high write enable signal.
reconfig_read0	input	reconfig_clk0	Active high read enable signal.
reconfig_address0[9:0]	input	reconfig_clk0	10-bit address bus used to specify address to be accessed for both read and write operations.
reconfig_writedata0[31:0]	input	reconfig_clk0	32-bit data bus. Carries the write data to the specified address.
reconfig_readdata0[31:0]	output	reconfig_clk0	32-bit data bus. Carries the read data from the specified address.
reconfig_waitrequest0	output	reconfig_clk0	Indicates when the Avalon® interface signal is busy. When asserted, all inputs must be held constant.
pll_cal_busy	output	Asynchronous	Status signal which is asserted high when PLL calibration is in progress. Perform logical OR with this signal and the `tx_cal_busy` port on the reset controller IP.
mcgb_rst	input	Asynchronous	Master CGB reset control. Deassert this reset at the same time as `pll_powerdown` .
tx_bonding_clocks[5:0]	output	N/A	Optional 6-bit bus which carries the low speed parallel clock outputs from the Master CGB. Used for channel bonding, and represents the x6/xN clock network.
mcgb_serial_clk	output	N/A	High speed serial clock output for x6/xN non-bonded configurations.
pcie_sw[1:0]	input	Asynchronous	2-bit rate switch control input used for PCIe protocol implementation.
pcie_sw_done[1:0]	output	Asynchronous	2-bit rate switch status output used for PCIe protocol implementation.
`fpll_to_fpll_cascade_clk`	output	N/A	fPLL to fPLL cascade output port (only in Core mode)
`active_clk`	output	N/A	Creates an output signal that indicates the input clock being used by the PLL. A logic Low on this signal indicates `refclk0` is being used and a logic High indicates `refclk1` is being used (only in Core mode with Clock Switchover enabled)
outclk0	output	N/A	Core output clock 0. (only in Core mode)
ext_lock_detect_clklow ⁵⁶	output	N/A	Clklow output for external lock detection. It can be exposed by selecting the Enable clklow and fref port.
ext_lock_detect_fref ⁵⁶	output	N/A	Fref output for external lock detection It can be exposed by selecting the Enable clklow and fref port.

⁵⁵ The fPLL fref and clklow signals should only be used with the Intel® external soft lock detection logic.

⁵⁶ The fPLL fref and clklow signals should only be used with the Intel® external soft lock detection logic.

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Arria® 10 Transceiver PHY User Guide

3.1.3.2. fPLL IP Core