DM8603EP DAVICOM [Davicom Semiconductor, Inc.], DM8603EP Datasheet - Page 73

• Manufacturer Part Number: DM8603EP
• Description: 10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
• Manufacturer: DAVICOM [Davicom Semiconductor, Inc.]

9.2.10 Broadcast Storm Filtering
lower bandwidth availability.
multicast. This feature can be set through REG 08h/09h/0Ah.12h.
setting is no broadcast storm protecting.
9.2.11 Bandwidth Control
bandwidth rate can be controlled separately, the other is combined together, this function can be set through
REG 08h/09h/0Ah.12h.[14]. The bandwidth control is disabled by default.
08h/09h/0Ah.15h.
9.2.12 Port Monitoring Support
Preliminary datasheet
DM8603-12-DS-P01
November 8, 2010
The DM8603 has an option to limit the traffic of broadcast or multicast packets, to protect the switch from
There are two types of broadcast storm control, one is throttling broadcast packet only, the other includes
The broadcast storm threshold can be programmed by EEPROM or REG 08h/09h/0Ah.15h, the default
The DM8603 supports two types of bandwidth control for each port. One is the ingress and egress
To separate and combined bandwidth control mode, the threshold rate is defined in REG
The behavior of bandwidth control as below:
The DM8603 supports “Port Monitoring” function on per port base, detail as below:
(1). For the ingress control, if flow control function is enabled, Pause or Jam packet will be transmitted.
(2). For the egress control, the egress port will not transmit any packets. On the other hand, the ingress
(3). In combined mode, if the sum of ingress and egress bandwidth over threshold, the bandwidth will
(1). Sniffer Port and Monitor Port
(2). Receive monitor
(3). Transmit monitor
(4). Exception
The ingress packets will be dropped if flow control is disabled.
bandwidth of source port will be throttled that prevent packets from forwarding.
be throttled.
There is only one port can be selected as “sniffer port” by REG 10h.13h, multiple ports can be set
as “receive monitor port” or “transmit monitor port” in REG 08h/09h/0Ah.12h.
All packets received on the “receive monitor port” are send a copy to “sniffer port”. For example,
port 0 is set as “receive monitor port” and port 2 is selected as a “sniffer port”. If a packet is
received form port 0 and predestined to port 1 after forwarding decision, the DM8603 will forward it
to port 1 and port 2 in the end.
All packets transmitted on the “transmit monitor port” are send a copy to “sniffer port”. For example,
port 1 is set as “transmit monitor port” and port 2 is selected as “sniffer port”. If a packet is received
from port 0 and predestined to port 1 after forwarding decision, the DM8603 will forward it to port 1
and port 2 in the end.
The DM8603 has an optional setting that broadcast/multicast packets are not monitored (see REG
08h/09h/0Ah.12h.[11]). It’s useful to avoid unnecessary bandwidth.
10/100 Mbps 3-port Ethernet Switch Controller with MII / RMII Interface
DM8603
73