PCIe 4.0 Receiver Link-Equalization Testing (Part II)

Figure 1: Working out the optimal combination of Tx emphasis
presets and receiver CTLE settings

As may be apparent from our previous post on PCIe 4.0 receiver link-equalization testing, this part of the PCIe 4.0 compliance tests is somewhat involved. When we left off last time, we were in the midst of receiver calibration, looking to ensure that the test-signal eye is as closed as possible without violating the specification limits.