What is the structure of Musk/Twitter debt financing? Is there a relationship between Musk's net worth via Tesla (margi collateral) and how much cash he has to

What is the structure of Musk/Twitter debt financing? Is there a relationship between Musk's net worth via Tesla (margi collateral) and how much cash he has to provide to finance debt? Does he need to raise personal cash if Twitter's cash flow is too low?