dm9332 Davicom Semiconductor, Inc., dm9332 Datasheet - Page 46

• Manufacturer Part Number: dm9332
• Description: 10/100mbps Ethernet Fiber/twisted Pair Single Chip Media Converter
• Manufacturer: Davicom Semiconductor, Inc.

2 in the end.
broadcast/multicast packets are not monitored (see
bit 4 of register 65h). It’s useful to avoid unnecessary
bandwidth.
default, up to 16 groups. Each port has a default VID
called PVID (Port VID, see register 6Fh). The
DM9332 used LSB 4-bytes of PVID as index and
mapped to register B0h~BFh, to define the VLAN
groups.
ports into three groups. Port 0 and port 1 in group A,
port 1 and port 2 in group B, finally, port 2 and port 0
in group C. In this case, the setting as below:
VLAN groups, as specified in bit 1 of register 53h. It’s
obvious that the tagged packets can be assigned to
several different VLANs which are determined
according to the VID inside the VLAN Tag. Therefore,
the operation is similar to port-based VLAN. The
DM9332 used LSB 4-bytes VID of received packet
with VLAN tag and VLAN Group Mapping Register
(B0h~BFh) to configure the VLAN partition. If the
destination port of received packet is not same VLAN
group with received port, it will be discarded.
46
(4).Exception
The DM9332 has an optional setting that
The DM9332 supports port-based VLAN as
For instance, we intend to partition DM9332’s
The DM9332 also supports 16 802.1Q-based
9.2.13 VLAN Support
9.2.13.1 Port-Based VLAN
9.2.13.3 Tag/Untag
Dest.
Dest.
Src.
Src.
0x8100
2 bytes
TPID
Length/Type
10/100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
TCI
Priority
3 bits
Length / Type
1 bits
CFI
VLAN uses an extra tag to identify the VLAN
membership
switch/router. A tagged frame is four bytes longer
than an untagged frame and contains two bytes of
TPID (Tag Protocol Identifier) and two bytes of TCI
(Tag Control Information).
port by bit 7 of register 6Dh in 802.1Q-based VLAN
mode. The operation of Tag and Un-tag can explain
as below conditions:
Un-tag port.
without modification.
port.
packet and recalculate CRC before sending it out.
port.
(1). Set PVID of Port 0 to 0x01h.
(2). Set PVID of Port 1 to 0x02h.
(3). Set PVID of Port 2 to 0x03h.
(4). Set register B1h to 0x06h.
(5). Set register B2h to 0x05h.
(6). Set register B3h to 0x03h.
Regarding IEEE 802.1Q standard, Tag-based
User can define each port as Tag port or Un-tag
(1). Receive untagged packet and forward to
Received packet will forward to destination port
(2). Receive tagged packet and forward to Un-tag
(3). Receive untagged packet and forward to Tag
9.2.13.2 802.1Q-Based VLAN
VID
12 bits
The DM9332 will remove the tag from the
Data
of
a
Data
frame
across
DM9332
Standard frame
Preliminary datasheet
Tagged frame
DM9332-15-DS-P01
VLAN-aware
August 26, 2009