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DM9006 Datasheet(PDF) 64 Page - Davicom Semiconductor, Inc.

Part No. DM9006
Description  10/100 Mbps 2-port Ethernet Switch Controller with General Processor Interface
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Maker  DAVICOM [Davicom Semiconductor, Inc.]
Homepage  http://www.davicom.com.tw
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DM9006 Datasheet(HTML) 64 Page - Davicom Semiconductor, Inc.

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DM9006
2-port Switch with Processor Interface
64
Preliminary datasheet
DM9006-13-DS-P01
September 1, 2009
Power-on
Initialization
Blocking
State
Listening
State
Learning
State
Forwarding
State
Disabled
State
IPv6 Multicast packets.
The Hop Limit in IPv6 header is 1.
The Next Header in IPv6 header is 0x3A (ICMPv6) or
0x00 (and next header of hop-by-hop option header is
0x3A).
The Type in ICMP header is 0x82 (Multicast Listener
Query), 0x83 (Multicast Listener Report) or 0x84
(Multicast Listener Done).
9.2.20 Spanning Tree Protocol Support
The DM9016 supports Spanning Tree Protocol and
provides four types of port state, Forwarding, Disable,
Learning and Blocking/Listening, see the Port
Security & STP Register (Reg6CH.[1:0]). This
function
needs
the
cooperation
n with external CPU. The following figure is the port
state diagram of Spanning Tree Protocol.
(1). Disable State:
Setting:
Reg6CH[5:4] = 2’b01
Description:
The port will neither receive
nor transmit any packets. Learning is
disabled.
Software Action:
None.
(2). Blocking State:
Setting:
Reg6CH[5:4] = 2’b11
Description:
Only
the
BPDUs
or
overriding packet will be received and
transmitted. Leaning is disabled.
Software Action:
In order to establish
spanning tree, the receiving BPDUs will be
forward
to
processor
port
but
the
processor should not send BPDUs to the
port in this state.
(3). Listening State:
Setting:
Reg6CH[5:4] = 2’b11
Description:
Only
the
BPDUs
and
overriding packet will be received and
transmitted. Leaning is disabled.
Software Action:
The receiving BPDUs
will be forward to processor port and the
processor can send BPDUs to the port in
this state.
(4). Learning State:
Setting:
Reg6CH[5:4] = 2’b10
Description:
Only
the
BPDUs
and
overriding packet will be received and
transmitted. Leaning is enabled.
Software Action:
The receiving BPDUs
will be forward to processor port and the
processor can send BPDUs to the port in
this state.
(5). Forwarding State:
Setting:
Reg6CH[5:4] = 2’b00
Description:
The port participates in
frame relay, learning, and STA calculation.
Software Action:
The receiving BPDUs
will be forward to processor port and the
processor can send BPDUs to the port in
this state.


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