KS8995MA-EVAL Micrel Inc, KS8995MA-EVAL Datasheet - Page 34

• Manufacturer Part Number: KS8995MA-EVAL
• Description: BOARD EVAL EXPERIMENT KS8995MA
• Manufacturer: Micrel Inc

Specifications of KS8995MA-EVAL

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 576-1018

Semptember 2008
Port Mirroring Support
KS8995MA/FQ 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
KS8995MA/FQ supports 16 active VLANs out of 4096 possible VLANs specified in IEEE 802.1q. KS8995MA/FQ
provides a 16-entry VLAN table, which converts VID (12 bits) to FID (4 bits) 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.
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
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
DA found in
example, 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 KS8995MA/FQ will forward the packet to
both port 4 and port 5. KS8995MA/FQ 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 KS8995MA/FQ will forward the
packet to both ports 1 and 5.
be 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 KS8995MA/FQ
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 KS8995MA/FQ will forward the packet to both port 2 and
port 5.
Yes
Yes
Yes
Yes
No
No
Don’t care
Don’t care
USE FID
Flag?
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
Yes
Yes
No
No
34
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].
M9999-091508