DM9013 datasheet(57/75 Pages) DAVICOM

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DM9013

3-port switch with Processor Interface

Preliminary datasheet

DM9013-15-DS-P03

April 9, 2009

(4).Exception

The DM9013 has an optional setting that

broadcast/multicast packets are not monitored (see

bit 4 of register 65h). It’s useful to avoid unnecessary

bandwidth.

9.2.13 VLAN Support

9.2.13.1 Port-Based VLAN

The DM9013 supports port-based VLAN as

default, up to 16 groups. Each port has a default VID

called PVID (Port VID, see register 6Fh). The

DM9013 used LSB 4-bytes of PVID as index and

mapped to register B0h~BFh, to define the VLAN

groups.

For instance, we intend to partition DM9013’s

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 3

in group C. In this case, the setting as below:

(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 PVID of Port 3 to 0x04h.

(5). Set register B1h to 0x02h.

(6). Set register B2h to 0x05h.

(7). Set register B3h to 0x0Ah.

(8). Set register B4h to 0x04h.

9.2.13.2 802.1Q-Based VLAN

Regarding IEEE 802.1Q standard, Tag-based

VLAN uses an extra tag to identify the VLAN

membership

frame

across

VLAN-aware

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).

Dest.

Src.

Length/Type

Data

Dest.

Src.

TPID

Data

TCI

Length / Type

Priority

CFI

VID

Standard frame

Tagged frame

0x8100

2 bytes

3 bits

1 bits

12 bits

VLAN_9013.vsd

The DM9013 also supports 16 802.1Q-based

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

DM9013 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.

9.2.13.3 Tag/Untag

User can define each port as Tag port or Un-tag

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:

(1). Receive untagged packet and forward to

Un-tag port.

Received packet will forward to destination port

without modification.

(2). Receive tagged packet and forward to Un-tag

port.

The DM9013 will remove the tag from the

packet and recalculate CRC before sending it out.

DM9013 Datasheet(PDF) 57 Page - Davicom Semiconductor, Inc.

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