How much money required for intraday for 1 lot bank nifty?

how much money required for intraday for 1 lot bank nifty?

I know that we can use leverage calculator but it shows 90k, can we buy or sell with 29k as given below.

Span
Rs: 60,419

Exposure margin
Rs: 29,933

Total margin ?
Rs: 90,352

https://zerodha.com/margin-calculator/Futures/