Other Parts Discussed in Thread: AM5746
Dear Technical Support Team,
CRS / CRS_DV has internal pullup(50kΩ) for bootstrap pin.
"Table 8-8. Recommended 4-Level Strap Resistor Ratios" describes RH=6.2kΩ and RL=1.96kΩ for mode3.
This pin is connected to PR2_MII0_CRS AM5746 and it has internal pullup or pulldown.
Could you tell me how to calculate considering the internal resistance of AM5746?
AM5746 Datasheet
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(6) Minimum PU = 900 Ω, maximum PU = 3.090 kΩ and minimum PD = 14.25 kΩ, maximum PD = 24.8 kΩ. For more information, see chapter 7 of the USB2.0 specification, in particular section Signaling / Device Speed Identification.
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Best Regards,
ttd