KSZ8842-16MVL TR Micrel, KSZ8842-16MVL TR Datasheet - Page 33

• Manufacturer Part Number: KSZ8842-16MVL TR
• Description: Ethernet ICs 2-Port Ethernet Switch/Repeater + Generic (8, 16-bit) bus interface(Lead Free)
• Manufacturer: Micrel

Specifications of KSZ8842-16MVL TR

• Rohs: yes
• Product: Ethernet Switches
• Package / Case: PQFP-128
• Mounting Style: SMD/SMT

Forwarding
The KSZ8842M forwards packets using the algorithm that is depicted in the following flowcharts. Figure 10 shows stage
one of the forwarding algorithm where the search engine looks up the VLAN ID, static table, and dynamic table for the
destination address, and comes up with “port to forward 1” (PTF1). PTF1 is then further modified by spanning tree, IGMP
snooping, port mirroring, and port VLAN processes to come up with “port to forward 2” (PTF2), as shown in Figure 11.
The packet is sent to PTF2.
Micrel, Inc.
October 2007
Figure 10. Destination Address Lookup Flow Chart in Stage One
Dynamic MAC Table
Search complete.
Static MAC Table
Search complete.
Get PTF1 from
Get PTF1 from
PTF1 = NULL
FOUND
FOUND
NO
33
Search complete.
Dynamic Table
Get PTF1 from
Search Static
VLAN table
VLAN ID
Search
valid?
Table
PTF1
Start
FOUND
FOUND
YES
NOT
NOT
- Search VLAN table
- Ingress VLAN filtering
- Discard NPVID check
This search is based on
DA or DA+FID
This search is based on
DA+FID
KSZ8842-16/32 MQL/MVL/MVLI/MBL
M9999-102207-1.9