GTM is configured using the GTM IP wizard within IP integrator block design of the IP catalog as shown in the following figure:
Figure 1. Configuring GTM for report_Power
All major parameters required for Report Power estimation can be set using UNISIM properties. The UNISIM properties are as follows:
- This is the GTM signal modulation scheme and is used to select NRZ and PAM4 signaling.
- This is the GTM channel line rate for given modulation scheme. For PAM4, the values range from 19.6 Gb/s to 58 Gb/s and for NRZ GTM linerate range is from 9.8 Gb/s to 29 Gb/s.
- This is the hardened RS-FEC usage. If this parameter is set to BYPASS, GTM bypasses the hardened FEC block. To use FEC, set this parameter to KP4.
- This is the GTM interface width and this property is added for future use. As of now, the interface width is derived from MODULATION_MODE.
- This is the equalization mode. The value of this parameter should be less than or equal to 10 dB for Low Power mode and greater 10 dB for High Performance mode.
- This is the amplitude of TX driver's differential swing and the valid values are 250, 275, 300, …, 1000, and1025.
The GTM Debug mode is determined by the attribute
is the ACJTAG_EN bit for each channel and is used to determine whether ACJTAG is active
Note: When the FEC_MODE parameter is set to KP4, GTM cannot bypass the hardened FEC block when PAM4 signaling is used. You should ensure that the FEC_MODE parameter is set to KP4 using PAM4.
The following figure is an example of report Power output for GTM.
Figure 2. Report Power Output for GTM