KSZ8995M A4 Micrel Inc, KSZ8995M A4 Datasheet - Page 31

• Manufacturer Part Number: KSZ8995M A4
• Manufacturer: Micrel Inc

Specifications of KSZ8995M A4

• 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 Supply Voltage (max): 1.9/2.6/3.6V
• Operating Supply Voltage (min): 1.7/2.4/3V
• Operating Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Compliant

Port Mirroring Support
KS8995M supports “port mirror” comprehensively as:
Multiple ports can be selected to be “rx sniffed” or “tx sniffed.” And any port can be selected to be the “sniffer port.” All these
per port features can be selected through Register 17.
VLAN Support
KS8995M supports 16 active VLANs out of 4096 possible VLANs specified in IEEE 802.1q. KS8995M provides a 16-entry
VLAN table, which converts VID (12 bits) to FID (4bits) for address look-up. If a non-tagged or null-VID-tagged packet is
received, the ingress port VID is used for look-up. In the VLAN mode, the look-up process starts with VLAN table look-up to
determine whether the VID is valid. If the VID is not valid, the packet will be dropped and its address will not be learned. If
the VID is valid, FID is retrieved for further look-up. FID+DA is used to determine the destination port. FID+SA is used for
learning purposes.
June 2009
KS8995M
Static MAC table
1. “Receive Only” mirror on a port. All the packets received on the port will be mirrored on the sniffer port. For example,
2. “Transmit Only” mirror on a port. All the packets transmitted on the port will be mirrored on the sniffer port. For
3. “Receive and Transmit” mirror on two ports. All the packets received on port A AND transmitted on port B will be
DA found in
port 1 is programmed to be “rx sniff,” and port 5 is programmed to be the “sniffer port.” A packet, received on port
1, is destined to port 4 after the internal look-up. The KS8995M will forward the packet to both port 4 and port 5.
KS8995M can optionally forward even “bad” received packets to port 5.
example, port 1 is programmed to be “tx sniff,” and port 5 is programmed to be the “sniffer port.” A packet, received
on any of the ports, is destined to port 1 after the internal look-up. The KS8995M will forward the packet to both port
1 and port 5.
mirrored on the sniffer port. To turn on the “AND” feature, set register 5 bit 0 to 1. For example, port 1 is programmed
to be “rx sniff,” port 2 is programmed to be “transmit sniff” and port 5 is programmed to be the “sniffer port.” A packet,
received on port 1, is destined to port 4 after the internal look-up. The KS8995M will forward the packet to port 4 only,
since it does not meet the “AND” condition. A packet, received on port 1, is destined to port 2 after the internal look-
up. The KS8995M will forward the packet to both port 2 and port 5.
Yes
Yes
Yes
Yes
No
No
USE FID Flag?
Don’t care
Don’t care
0
1
1
1
Table 7. FID+DA Look-Up in the VLAN Mode
FID Match?
Don’t care
Don’t care
Don’t care
Yes
No
No
Dynamic MAC table
DA+FID found in
Don’t care
Don’t care
31
Yes
Yes
No
No
Action
Broadcast to the membership ports defined in the
VLAN table bit [20:16]
Send to the destination port defined in the
dynamic MAC table bit [54:52]
Send to the destination port(s) defined in the
static MAC table bit [52:48]
Broadcast to the membership ports defined in
the VLAN table bit [20:16]
Send to the destination port defined in the
dynamic MAC table bit [54:52]
Send to the destination port(s) defined in the
static MAC table bit [52:48]
M9999-062309
Micrel, Inc.