參數資料
型號: KS8995XA
廠商: Micrel Inc
文件頁數: 19/51頁
文件大?。?/td> 0K
描述: IC SWITCH 10/100 5PORT 128PQFP
標準包裝: 66
系列: *
類型: *
應用: *
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應商設備封裝: 128-PQFP(14x20)
包裝: 散裝
配用: 576-1604-ND - EVAL KIT EXPERIMENTAL KS8995XA
KS8995XA
Micrel, Inc.
M9999-051305
26
May 2005
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:
Comparison
Priority
802.1p Priority ≥ Base Priority
High
802.1p Priority < Base Priority
Low
Table 4. 802.1p Priority
Preamble
DA
SA
TCI
86
6
4
Length
LLC
Data
CRC
246-1500
4
1
Tagged Packet Type
(8100 for Ethernet)
802.1p
CFI
VLAN ID
Bytes
Bits
16
3
12
Figure 8. 802.3 Tagged Packet
V
IP
Siz
ader
46
4
Preamble
DA
SA
Tag
86
6
Type
Data
CRC
246-1500
4
Bytes
Bits
er.
0x4
DiffServ
Res.
2
He
e
42
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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