You want to continue to get 1g of protein per lb. of body weight.
As for the rest, I'm not sure. I'd think that you would want to consume maintenance level calories, since you don't need the excess calories for building muscle. However, since you're not working out, your maintenance level is much lower than it is during your HST cycle.
I too am in my SD, and I have opted to eat less than maintenance calories. I'm hoping that I can lose some fat while maintaining muscle. Basically, I'm trying to do a cutting SD instead of a cutting cycle. I don't know if this is a good idea or not. If I start to lose muscle, I'll increase the calories. Besides, I don't think that it would be too difficult to regain any lost muscle. So, is it OK to cut during SD?