LAN9311-NU Standard Microsystems (SMSC), LAN9311-NU Datasheet - Page 81
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LAN9311-NU
Manufacturer Part Number
LAN9311-NU
Description
TWO PORT 10/100 MANAGED ETHERNET SWITCH
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN9311-NU.pdf
(460 pages)
Specifications of LAN9311-NU
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Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9311/LAN9311i
6.5.7
6.6
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:
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:
The switch fabric is capable of generating multiple maskable interrupts from the buffer manager, switch
engine, and MACs. These interrupts are detailed in
page
Switch Fabric Interrupts
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)
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)
51.
DATASHEET
81
Section 5.2.2, "Switch Fabric Interrupts," on
Revision 1.7 (06-29-10)
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