Table 17-6: Threshold Registers Bit Field Name Description RD_LPR_THRSLD Read LPR threshold. RD_HPR_THRSLD Read HPR threshold. WR_THRSLD Write threshold. When the DDRC CAM levels reaches their threshold, the QoS controller applies the following throttling rules. Table 17-7: Throttling Rules Rule Description Read channel throttle rules If ((slots available in read LPR CAM £ read LPR threshold) && PORTn_LPR_CTRL == 1), then assert pa_rmark to DDRC for all best effort ports. If ((slots available in read HPR CAM £ read HPR threshold) && PORTn_HPR_CTRL == 1),then assert pa_rmark to DDRC for all low-latency ports Write channel throttle rule If ((slots available in write CAM £ write CAM threshold) && PORTn_WR_CTRL == 1),then assert pa_wmask to DDRC for all best-effort ports.