The LMK3H2108 can be configured to start up on one of four OTP pages when any combination of GPIO_0, GPIO_1, and GPIO_2 are configured as OTP Page Selection (OTP_SEL) pins on each page. If no GPIO are configured as OTP_SEL pins, the device loads the default OTP page selected in the configuration, most commonly OTP Page 0. On each OTP page, the I²C interface is available.

The default configuration when using an LMK3H2108A00 device is eight 100MHz 100Ω LP-HCSL outputs. OTP Page 0 has no spread spectrum clocking (SSC) enabled, and each other OTP page uses spread spectrum:

• Page 0: No SSC
• Page 1: -0.1% downspread SSC
• Page 2: -0.3% down-spread SSC
• Page 3: -0.5% down-spread SSC

An LMK6H device is present on the board for optionally driving IN0 from a PCIe-compatible reference in buffer mode..