NS16550A - UART

Files (ADFs) These files each have an I D number that associates each ADF with the matching adapter card I D number The ADF contains specific information used by the operator during system configuration such as the adapter card name the system resources the adapter can use and help information It in

• regardless of the data bus width One of these is a centralized arbitration controller that allows up to 16 devices to contend for the 8 available DMA channels These devices compete based on an assigned priority level for the DMA resource A ‘‘fairness’’ option allows lower priority devices to compete successfully for a DMA channel even though higher priority devices may require a transfer If the fairness option is enabled each device that has received DMA service must wait until all other devices.