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LAN9210 Datasheet(PDF) 81 Page - SMSC Corporation |
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LAN9210 Datasheet(HTML) 81 Page - SMSC Corporation |
81 / 146 page High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface Datasheet SMSC LAN9312 81 Revision 1.2 (04-08-08) DATASHEET 6.5.7 Counters A counter is maintained per port that contains the number of packets dropped due to buffer space limits and ingress rate limit discarding (Red and random Yellow dropping). These counters are accessible via the following registers: Buffer Manager Port 0 Drop Count Register (BM_DRP_CNT_SRC_MII) Buffer Manager Port 1 Drop Count Register (BM_DRP_CNT_SRC_1) Buffer Manager Port 2 Drop Count Register (BM_DRP_CNT_SRC_2) A counter is maintained per port that contains the number of packets dropped due solely to ingress rate limit discarding (Red and random Yellow dropping). This count value can be subtracted from the drop counter, as described above, to obtain the drop counts due solely to buffer space limits. The ingress rate drop counters are accessible via the following registers: Buffer Manager Port 0 Ingress Rate Drop Count Register (BM_RATE_DRP_CNT_SRC_MII) Buffer Manager Port 1 Ingress Rate Drop Count Register (BM_RATE_DRP_CNT_SRC_1) Buffer Manager Port 2 Ingress Rate Drop Count Register (BM_RATE_DRP_CNT_SRC_2) 6.6 Switch Fabric Interrupts The switch fabric is capable of generating multiple maskable interrupts from the buffer manager, switch engine, and MACs. These interrupts are detailed in Section 5.2.2, "Switch Fabric Interrupts," on page 51. |
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