KSZ8995XA Micrel Inc, KSZ8995XA Datasheet - Page 27
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KSZ8995XA
Manufacturer Part Number
KSZ8995XA
Description
IC SWITCH 10/100 5PORT 128PQFP
Manufacturer
Micrel Inc
Specifications of KSZ8995XA
Applications
*
Mounting Type
Surface Mount
Package / Case
128-MQFP, 128-PQFP
Number Of Primary Switch Ports
5
Internal Memory Buffer Size
64
Operating Supply Voltage (typ)
1.8/2.5/3.3V
Fiber Support
Yes
Integrated Led Drivers
Yes
Phy/transceiver Interface
MII/SNI
Power Supply Type
Analog/Digital
Package Type
PQFP
Data Rate (typ)
10/100Mbps
Vlan Support
Yes
Operating Temperature (max)
70C
Operating Temperature (min)
0C
Pin Count
128
Mounting
Surface Mount
Jtag Support
No
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
576-1642 - BOARD EVALUATION FOR KSZ8995XA
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Other names
576-1042
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
KSZ8995XA
Manufacturer:
MICREL
Quantity:
1 334
Company:
Part Number:
KSZ8995XA
Manufacturer:
MICREL30
Quantity:
348
Part Number:
KSZ8995XA
Manufacturer:
MICREL
Quantity:
20 000
September 2008
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 6. These 3 bits
are compared against the base priority. The prioritization policy is as follows:
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 7.
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.
Bytes
Bytes
Preamble
Preamble
8
8
Comparison
802.1p Priority ≥Base Priority
802.1p Priority < Base Priority
Bits
Ta gged Packet Type
6
(8100 fo r Ethernet)
6
DA
DA
Bits
16
SA
Figure 6. 802.3 Tagged Packet
SA
6
6
Table 4. 802.1p Priority
Figure 7. IPv4 Packet
IP
0x 4
802.1 p
V
4
er.
Ta g
TCI
4
3
4
Length
1
Type
2
2
27
He
Siz
ader
4
LLC
VLAN I D
6
2
e
12
DiffServ
Priority
2
Da ta
High
Low
46-1500
46-1500
Data
Res.
CRC
CRC
4
4
M9999-091508