SPRUJ64 September 2022
The clock buffer of part number LMK1C1103PWR is used to drive the 25-MHz clock to the Ethernet PHYs. LMK1C1103PWR is a 1:3 LVCMOS clock buffer, which takes a 25-MHz crystal/LVCMOS reference input and provides three 25-MHz LVCMOS clock outputs. The source for the clock buffer will be either the CLKOUT0 pin from the SoC or a 25-MHz oscillator (ECS-2520MV-250-CN-TR); the selection can be made using a set of resistors. By default, the oscillator is used as input to the clock buffer in AM64x SKEVM. Output Y2 and Y3 of the clock buffer LMK1C1103PWR are used as a reference clock input for two Gigabit Ethernet PHYs in SKEVM.