GTS Transceiver PHY User Guide

ID 817660
Date 7/08/2024
Public
Document Table of Contents

3.3.9. Analog Parameter Options

You can use the transceiver analog parameter settings to tune the analog functions in the GTS PMAs while designing high-speed serial protocol solutions. You can use this feature to compensate for signal losses for high data rate communications.

You can choose to set the transceiver Analog TX and Analog RX parameters in the Analog Parameters tab of the GTS PMA/FEC Direct PHY Intel FPGA IP GUI. You can also set the HSSI_PARAMETER in the .qsf file for a specific lane that you have configured within the GTS PMA/FEC Direct PHY Intel FPGA IP GUI instance. Setting these parameters via the .qsf file has precedence over the analog parameter settings in the IP GUI. Refer to Configurable Quartus® Prime Software Settings for more information.

Figure 49. Analog Parameter Options in Parameter Editor
Table 30.  GTS PMA Transmitter Analog Settings
Parameter Values Description
Spread Spectrum 32 DISABLE/ENABLE Specifies whether TX PLL reference clock is spread spectrum. Default value is DISABLE.
Note: Spread spectrum is not supported when you use the fast PLL mode of the TX PLL. The operating range of the VCO for the fast PLL mode is 13.5 GHz to 16.0 GHz. Data rates in this range and those represented by division factors of 2, 4, 8, and 16 are all excluded from enabling spread spectrum.
Enable TX P&N Invert
Note: This feature is preliminarily in the current Quartus® Prime Pro Edition software release.
DISABLE/ENABLE Invert TX serial outputs P and N pins. Default value is DISABLE 34.
TX EQ Post Tap 1, 1.0 step size 0 to 19 TX equalization control for Post Tap 1. Default value is 5 33.
TX EQ Main Tap, 1.0 step size 0 to 55 TX equalization control for Main Tap. Default value is 52 33.
TX EQ Pre Tap 1, 1.0 step size 0 to 15 TX equalization control for Pre Tap 1. Default value is 0.
TX EQ Pre Tap 2, 1.0 step size 0 to 7 TX equalization control for Pre Tap 2. Default value is 0.
Table 31.  GTS PMA Receiver Analog Settings
Parameter Values Description
RX Adaptation mode auto/manual Specifies the type of RX adaptation mode.

Auto Adaptation — Firmware based adaptation mode.

Manual Adaptation — Firmware based adaptation is disabled. You must configure and control the RX Analog parameters such as RX EQ VGA Gain, RX EQ High Frequency Boost and RX EQ DFE Data Tap 1 to tune the RX links in Analog Parameters tab of the IP GUI or in .qsf assignment file.

You can change the RX Adaptation mode to manual if you are running at a lower data rate. However, if you are running at a low data rate but the link is lossy, you may need to use the auto adaptation mode. Default value is auto.

Enable RX P&N Invert
Note: This feature is preliminarily in the current Quartus® Prime Pro Edition software release.
DISABLE/ENABLE Invert RX serial input P and N pins. Default value is DISABLE 34.

RX External Coupling Mode

AC/DC Specifies the type of external on-board coupling mode. Default value is AC.
Selects value of RX termination mode GROUNDED/DIFFERENTIAL Specifies the RX PMA buffer termination mode.

GROUNDED mode is used for AC coupled link.

DIFFERENTIAL mode is used for DC coupled link. 34

Default value is GROUNDED.
Selects value of RX onchip termination R_1(85 omhs)

R_2(100 omhs)

Selects RX on-chip termination resistor value. Default value is R_2(100 omhs).
RX EQ VGA Gain 0 to 63 Select the RX Equalization VGA Gain setting. This option is only available if you configure the RX Adaptation mode to manual. This setting is not available when RX adaptation mode is set to auto. Default value is 0.
RX EQ High Frequency Boost 0 to 63 Select the RX Equalization High Frequency Boost setting. This option is only available if you configure the RX Adaptation mode to manual. This setting is not available when RX adaptation mode is set to auto. Default value is 0.
RX EQ DFE Tap1 0 to 63 Select the RX Equalization DFE Tap1 setting. This option is only available if you configure the RX Adaptation mode to manual. This setting is not available when RX adaptation mode is set to auto. Default value is 0.
32 The Spread Spectrum clocking mode is enabled by default when you select the Display Port protocol in the PMA Configuration Rules setting.
33 This is the default value but you can change this value in the Analog Parameter GUI or the HSSI_PARAMETER in the .qsf file.
34 Preliminary setting pending hardware verification.