In court papers today Trump's lawyers asked the judge to "stay the judgement" while Trump appeals the case.
Stay the judgment means you don't pay the penalty. However, this usually means putting up what's known as an undertaking for the amount of the judgment and that money is held in escrow while you appeal.
Trump is asking the judge to put up a partial amount of the judgment, because otherwise Trump would suffer an.irreparable harm. They are asking to put up a bond of 100 million instead of the full judgment as the undertaking. Trump's lawyers say to put up the full amount. Trump would need to sell property.
Irreparable Harm Inheres to Appellants from Any Forced Sale of Properties In the absence of a stay on the terms herein outlined, properties would likely need to be sold to raise capital under exigent circumstances, and there would be no way to recover any property sold following a successful appeal and no means to recover the resulting financial losses
https://www.cbsnews.com/news/trump-fraud-appeal-bond-new-york/
Yes he testified that he has $400 million cash
That article has new news in it. Trump has to put up the full amount, but can seek a loan to raise the amount he doesn't have.
To answer your question the same article says
so maybe $400 million wouldn't have been enough.
Also he might need some cash to cover his other expenses. He still has loans to tune of a couple hundred million he needs to keep servicing.
So we will see what happens now that this judge halted the ban on loans