KSZ8863RLL-EVAL Micrel Inc, KSZ8863RLL-EVAL Datasheet - Page 36

• Manufacturer Part Number: KSZ8863RLL-EVAL
• Description: BOARD EVALUATION FOR KSZ8863RLL
• Manufacturer: Micrel Inc

Specifications of KSZ8863RLL-EVAL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3868

Micrel, Inc.
IGMP Support
For Internet Group Management Protocol (IGMP) support in layer 2, the KSZ8863MLL/FLL/RLL provides two
components:
IGMP Snooping
The KSZ8863MLL/FLL/RLL traps IGMP packets and forwards them only to the processor (port 3). The IGMP packets are
identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4 and protocol
version number = 0x2.
Multicast Address Insertion in the Static MAC Table
Once the multicast address is programmed in the Static MAC Table, the multicast session is trimmed to the subscribed
ports, instead of broadcasting to all ports.
To enable IGMP support, set register 5 bit [6] to ‘1’. Also, Tail Tagging Mode needs to be enabled, so that the processor
knows which port the IGMP packet was received on. This is achieved by setting both register 3 bit [6] and register 48 bit
[2] to ‘1’.
Port Mirroring Support
KSZ8863MLL/FLL/RLL supports “Port Mirroring” comprehensively as:
Multiple ports can be selected as “receive sniff” or “transmit sniff”. In addition, any port can be selected as the “sniffer port”.
All these per port features can be selected through registers 17, 33 and 49 for ports 1, 2 and 3, respectively.
Rate Limiting Support
The KSZ8863MLL/FLL/RLL provides a fine resolution hardware rate limiting from 64Kbps to 99Mbps. The rate step is
64Kbps when the rate range is from 64Kbps to 960Kbps and 1Mbps for 1Mbps to 100Mbps(100BT) or to 10Mbps(10BT)
(refer to Data Rate Limit Table). The rate limit is independently on the “receive side” and on the “transmit side” on a per
port basis. For 10BASE-T, a rate setting above 10 Mbps means the rate is not limited. On the receive side, the data
receive rate for each priority at each port can be limited by setting up Ingress Rate Control Registers. On the transmit side,
the data transmit rate for each priority queue at each port can be limited by setting up Egress Rate Control Registers. The
size of each frame has options to include minimum IFG (Inter Frame Gap) or Preamble byte, in addition to the data field
(from packet DA to FCS).
For ingress rate limiting, KSZ8863MLL/FLL/RLL provides options to selectively choose frames from all types, multicast,
broadcast, and flooded unicast frames. The KSZ8863MLL/FLL/RLL counts the data rate from those selected type of
frames. Packets are dropped at the ingress port when the data rate exceeds the specified rate limit.
For egress rate limiting, the Leaky Bucket algorithm is applied to each output priority queue for shaping output traffic. Inter
frame gap is stretched on a per frame base to generate smooth, non-burst egress traffic. The throughput of each output
priority queue is limited by the egress rate specified.
If any egress queue receives more traffic than the specified egress rate throughput, packets may be accumulated in the
output queue and packet memory. After the memory of the queue or the port is used up, packet dropping or flow control
will be triggered. As a result of congestion, the actual egress rate may be dominated by flow control/dropping at the
ingress end, and may be therefore slightly less than the specified egress rate.
November 2009
“receive only” mirror on a port
All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to be “receive
sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2 after the
internal lookup. The KSZ8863MLL/FLL/RLL forwards the packet to both port 2 and port 3. The KSZ8863MLL/FLL/RLL
can optionally even forward “bad” received packets to the “sniffer port”.
“transmit only” mirror on a port
All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“transmit sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 2 is destined to port 1 after
the internal lookup. The KSZ8863MLL/FLL/RLL forwards the packet to both port 1 and port 3.
“receive and transmit” mirror on two ports
All the packets received on port A and transmitted on port B are mirrored on the sniffer port. To turn on the “AND”
feature, set register 5 bit [0] to ‘1’. For example, port 1 is programmed to be “receive sniff”, port 2 is programmed to be
“transmit sniff”, and port 3 is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2 after
the internal lookup. The KSZ8863MLL/FLL/RLL forwards the packet to both port 2 and port 3.
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KSZ8863MLL/FLL/RLL
M9999-110309-1.1