maybe you need glasses 
the comment says:
1uus = 512/499.2 micro seconds … this gives 1.0256 micro seconds, and when you convert this to device time units (in DW1000 clock units), you have 1.0256e-6/15.65e-12 = 65536
maybe you need glasses
the comment says:
1uus = 512/499.2 micro seconds … this gives 1.0256 micro seconds, and when you convert this to device time units (in DW1000 clock units), you have 1.0256e-6/15.65e-12 = 65536