LMKDB11xx and LMKDB12xx devices input buffer stage supports four different configurations:

• DC coupled HCSL inputs.
• DC coupled LVDS input signal with external 100Ω termination resistor.
• AC coupled inputs with internal self-bias. See AC-Coupled or DC-Coupled Clock Inputs for more details.
• Internal 50Ω to ground terminations. See Internal Termination for Clock Inputs for more details.

All the devices with two inputs have individual AC coupling and input termination option. To configure each input, refer to register map for configuration bits.

Figure 8-3 HCSL Input Interface (PCIe Standard)

Figure 8-5 External AC-Coupled Input

Figure 8-4 LVDS Input Interface

Figure 8-6 Receiver Internal Terminations