dm9302 Davicom Semiconductor, Inc., dm9302 Datasheet - Page 52

• Manufacturer Part Number: dm9302
• Description: 10/100mbps Ethernet Fiber/twisted Pair Media Converter With Local Bus
• Manufacturer: Davicom Semiconductor, Inc.

Strict
Queuing (WRR) based on their priority and queue
weight. Queues with larger weights get more service
than smaller. This mechanism can get highly efficient
bandwidth and smooth the traffic. Strict Priority
Queuing (SPQ) based on priority only. The Packet on
the highest priority queue is transmitted first. The next
highest-priority queue is work until last queue empties,
and so on. This feature can be set in bit 5 of register
6Dh.
default. Each port has a 2-bit priority value as index
for splitting ingress packets to the corresponding
transmit queue. This value can be set in bit 0 and 1 of
register 6Dh.
52
9.2.14.1 Port-Based Priority
9.2.14.2 802.1p-Based Priority
Port based priority is the simplest scheme and as
802.1p priority can be disabled by bit 2 of register
Priority
Queuing.
Weighted
10/100Mbps Ethernet Fiber/Twisted Pair Media Converter with Local bus
Round-Robin
6Dh, it is enabled by default.
received packet with 802.1p VLAN tag, and maps this
field against VLAN Priority Map Registers (D0h~D1h)
to determine which transmit queue is designated. The
VLAN Priority Map is programmable.
6-bit of the ToS field in standard IPv4 header, and
maps this field against ToS Priority Map Registers
(C0h~CFh) to determine which transmit queue is
designated. The ToS Priority Map is programmable
too. In addition, User can only refer to most
significant 3-bit of the ToS field optionally, see bit 7 of
register 53h.
9.2.14.3 DiffServ-Based Priority
The DM9302 extracts 3-bit priority field from
DiffServ based priority uses the most significant
DM9302
Preliminary datasheet
DM9302-15-DS-P01
July 30, 2009