Feed the output of a Clock into a Gain of 1/2. Feed the touput of that gain into a Trigonmetric Function block, select the cos option. Feed the output of that into a Gain of -2. Feed the output of that into a Bias block, set the parameter to 2.
Or use the fact that
cos(t/2) == sin(t/2 + pi/2)
Amplitude = -2
Frequency = 1/2
Phase = pi/2
Bias = 2
