LAN9313-NZW SMSC, LAN9313-NZW Datasheet - Page 76

• Manufacturer Part Number: LAN9313-NZW
• Description: Ethernet ICs Three Port 10/100 Ethernet Switch
• Manufacturer: SMSC
• Type: Three Port Managed Ethernet Switchr

Specifications of LAN9313-NZW

• Ethernet Connection Type: 10 Base-T, 100 Base-TX
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Switches
• Number Of Transceivers: 1
• Standard Supported: 802.3, 802.3u
• Data Rate: 10 Mbps, 100 Mbps
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 0 V
• Supply Current (max): 155 mA, 270 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.7 (06-29-10)
6.4.7
6.4.8
Broadcast Throttle Level
Broadcast Storm Control
In addition to ingress rate limiting, the LAN9313/LAN9313i supports hardware broadcast storm control
on a per port basis. This feature is enabled via the
(SWE_BCST_THROT). The allowed rate per port is specified as the number of bytes multiplied by 64
allowed to be received every 1.72 mS interval. Packets that exceed this limit are dropped. Typical
values are listed in
of not limiting the rate.
In addition to the rate limit, the
specifies the maximum number of buffers that can be used by broadcasts, multicasts, and unknown
unicasts.
IPv4 IGMP Support
The LAN9313/LAN9313i provides Internet Group Management Protocol (IGMP) hardware support
using two mechanisms: IGMP monitoring and Multicast Pruning.
On ingress, if IGMP packet monitoring is enabled in the
Register
IGMP monitoring port (typically set to the port to which the host CPU is connected). IGMP packets are
identified as IPv4 packets with a protocol of 2. Both Ethernet and IEEE 802.3 frame formats are
supported as are VLAN tagged packets.
Once the IGMP packets are received by the host CPU, the host software can decide which port or
ports need to be members of the multicast group. This group is then added to the ALR table as detailed
in
IGMP packet if necessary.
Normally, packets are never transmitted back to the receiving port. For IGMP monitoring, this may
optionally be enabled via the
(SWE_GLOBAL_INGRSS_CFG). This function would be used if the monitoring port wished to
participate in the IGMP group without the need to perform special handling in the transmit portion of
the driver software.
Section 6.4.1.3, "Multicast Pruning," on page
252
168
134
(SWE_GLOBAL_INGRSS_CFG), IGMP multicast packets are trapped and redirected to the
67
34
17
8
4
3
2
1
Table
Table 6.4 Typical Broadcast Rate Settings
6.4. When a port is receiving at 10Mbps, any setting above 34 has the effect
Buffer Manager Broadcast Buffer Level Register (BM_BCST_LVL)
DATASHEET
Switch Engine Global Ingress Configuration Register
76
66. The host software should also forward the original
Switch Engine Broadcast Throttling Register
Switch Engine Global Ingress Configuration
Three Port 10/100 Managed Ethernet Switch with MII
Bandwidth
900 Kbps
600 Kbps
300 Kbps
2.4 Mbps
1.2 Mbps
75 Mbps
50 Mbps
40 Mbps
20 Mbps
10 Mbps
5 Mbps
SMSC LAN9313/LAN9313i
Datasheet