KS8993F-A1 Micrel Inc, KS8993F-A1 Datasheet - Page 39

• Manufacturer Part Number: KS8993F-A1
• Description: IC CONV MED 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8993F-A1

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• For Use With: KS8993F-EVAL - EVAL KIT EXPERIMENTAL KS8993F
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

KS8993F
Advanced VLAN features, such as “Ingress VLAN filtering” and “Discard Non PVID packets” are also supported by the
KS8993F. These features can be set on a per port basis, and are defined in register 18, bit 6 and 5, respectively for
port 1.
2.9.3 QoS Priority
This feature provides Quality of Service (QoS) for applications, such as VoIP and video conferencing. The KS8993F
per port transmit queue could be split into two priority queues: a high priority queue and a low priority queue. Bit 0 of
registers 16, 32 and 48 is used to enable split transmit queues for ports 1, 2 and 3, respectively. Optionally, the
Px_TXQ2 strap-in pins can be used to enable this feature. With split transmit queues, high priority packets will be
placed in the high priority queue and low priority packets will be placed in the low priority queue.
For split transmit queues, the KS8993F provides four priority schemes:
August 26, 2004
DA found in
Static MAC
Dynamic MAC Table?
Table?
Yes
Yes
Yes
Yes
No
No
FID+SA found in
Yes
No
Use FID flag?
Don’t care
Don’t care
0
1
1
1
Table 7: FID+DA look up in VLAN mode
Table 8: FID+SA look up in VLAN mode
Learn and add FID+SA to the Dynamic MAC Address Table
Update time stamp
FID match?
Don’t care
Don’t care
Don’t care
Yes
No
No
- 39 -
MAC Table?
Don’t care
Don’t care
Dynamic
found in
DA+FID
Yes
Yes
No
No
Action
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Send to the destination port defined in
the Dynamic MAC Address Table bits
[53:52]
Send to the destination port(s) defined
in the Static MAC Address Table
bits [50:48]
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Send to the destination port defined in
the Dynamic MAC Address Table bits
[53:52]
Send to the destination port(s) defined
in the Static MAC Address Table
bits [50:48]
Action
Revision 1.0
Micrel