The formula you've provided for Cash Debt Coverage shows the relationship between cash flow from operations after accounting for dividends and total debt. The correct interpretation of this formula is:
This ratio shows the percent of debt that current cash flow can retire.
In essence, it indicates how well a company can cover its total debt obligations with the cash it generates from its operations, minus any dividends paid. A higher ratio generally suggests better financial health and the ability to repay debt with cash flow from operations.