The TI TSW1405 and TSW1406 both utilize the ECP3-35 to interface to their converters. The TSW1405 is for evaluating TI ADCs. The TSW1406 is to evaluate TI DACs. Lattice supports the HDL as a reference design so a customer can use this code in their own design.
Below is a photo of the TSW1405 and a TI ADC board plugged into it.