參數(shù)資料
型號(hào)： KSZ8995XA
廠商： MICREL INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： Integrated 5-Port 10/100 QoS Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PQFP128
封裝： LEAD FREE, PLASTIC, QFP-128
文件頁數(shù)： 26/51頁
文件大小： 305K
代理商： KSZ8995XA
KS8995XA
The KS8995XA can classify tagged packets using the 802.1p tag-based priority. In this prioritization scheme, the user can
enable the 802.1p classification on a per port basis in bit 5 of registers 0x10, 0x20, 0x30, 0x40 and 0x50 for ports 1, 2, 3, 4,
and 5, respectively. Then the user specifies the 802.1p base priority in register 0x02, bits [6-4]. When a tagged packet is
received, the KS8995XA examines the 3 bit 802.1p priority field shown in Figure 8. These 3 bits are compared against the base
priority. The prioritization policy is as follows:
Micrel, Inc.
M9999-051305
26
May 2005
Comparison
802.1p Priority
≥
Base Priority
802.1p Priority < Base Priority
Priority
High
Low
Table 4. 802.1p Priority
Preamble
DA
SA
TCI
8
6
6
4
Length
LLC
Data
CRC
2
46-1500
4
1
Tagged Packet Type
(8100 for Ethernet)
802.1p
C
VLAN ID
Bytes
Bits
16
3
12
Figure 8. 802.3 Tagged Packet
V
0x4
IP
Siz
ader
e
4
6
4
Preamble
DA
SA
Tag
8
6
6
Type
Data
CRC
2
46-1500
4
Bytes
Bits
er.
DiffServ
Res.
2
He
4
2
Figure 9. IPv4 Packet
In order to support QoS from end-to-end in a network, the KS8995XA can also classify packets based on the IPv4 DiffServ
field shown in Figure 9.
The DiffServ field consists of 6 bits, which can be used to specify 64 code points. The KS8995XA provides 64 bits (DSCP[63:0])
in 8 registers (0x60 to 0x67), in which the user specifies the priority of each of the 64 code points. The DiffServ classification
is enabled on a per port basis in bit 6 of registers 0x10, 0x20, 0x30, 0x40 and 0x50 for ports 1, 2, 3, 4, and 5, respectively. If
the DiffServ classification is enabled on a port, the KS8995XA will decode the IPv4 DiffServ field and look at the user defined
code point bit to determine if the packet is high priority or low priority. If the code point is a ‘1’, the packet is high priority. If the
code point is ‘0’, the packet is low priority.
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