SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
When operating in normal mode, lower priority frames are dropped before higher priority frames. The intention is to give preference to higher priority frames. Priority 3 is the highest priority and is allowed to fill the FIFO. Priority 2 will drop packets if the packet is going to take space in the last 2k available. Priority 1 will drop packets if the packet is going to take space in the last 4k available. Priority 0 will drop packets if the packet is going to take space in the last 6k available. If fewer than 4 priorities are to be implemented then the priorities should be mapped such that the highest priorities are used. For example, if two priorities are going to be used then all packets should be mapped to priorities 3 and 2 and priorities 1 and 0 should be unused. Priority escalation may be used in normal priority mode if desired. Normal priority mode is configured as described below: