What is wrong with my Simulink model for random road profile?

I am trying to generate Random Road Profile Garde-C as per ISO-2631 using shaping filter equation:

d/dt (Z_R (t))= -∝VZ_R (t)+ w(t)

where w(t) is a white noise process with the spectral density 2αVσ^2 .

here,

V= vehicle speed

α = 0.127

σ = standard deviation

The Table and Simulink Model used for Generating Road profile is shown below in the figure.

What value I have to use in random Number Block to produce White Noise? For Garde-C profile input parameter for Random Number block are taken as "Mean =0" , "Variance = 0.000064" and "Seed =0" . But the profile is not coming as expected.

Am I selecting the right parameters for Random Number Block?