It can be seen that SN75LVCP601 datasheet has parameters of differential impedance (min 85Ω max 122 Ω, typ 100 Ω) and single-ended impedance (min 40 Ω).
My question is that SATA is a differential signal and must be designed according to differential impedance. What is the significance of single-ended impedance? Under what circumstances will this single-ended impedance be used? Or in the design of differential lines, it is necessary to meet the requirements that the differential impedance is 100 and the single-ended impedance of each line is greater than 40 Ω?