MDS213 Datasheet, PDF (95/120 Pages) Zarlink Semiconductor Inc – 12-Port 10/100Mbps + 1Gbps Ethernet Switch

MDS213
Data Sheet
Address:h5DC
• THKM6
Address:h5E0
Trunking Forwarding Port Mask 6
Forwarding Port mask for hash key 6
• THKM7
Address:h5E4
Trunking Forwarding Port Mask 7
Forwarding Port mask for hash key 7
Access: Non-Zero-Wait-State,Direct Access,Write/Read
31
12 11
0
TK_MSK
Bit [11:0] TK_MSKPort trunk mask for trunking hash key
Bit [31:12] Reserved
CPU sets up this table as follows:
1. Set all bits not in Trunk Groups to 1
2. Set all bits in the Trunk Group to 0
3. Pick one forwarding port per trunk group and turn the corresponding bit to 1 (Each Hash Key may have different
forwarding ports, the rule to pick forwarding ports is up to the CPU).
Usage: These masks are used to prevent flooded or multicast packets from being transmitted out with more than
one port on a trunk. The Trunking Hash Key is used to select the proper mask (for load distribution). The mask
value will be set up to mask off all but one port within each trunk group.
18.2.11.4 IPMCAS - IP Multicast MAC Address Signature
Usage: For following four registers IPMCAS0, IPMCAS1, IPMCMSK0 and IPMCMSK1, are used to distinguish
between IP multicast traffic and regular multicast. The MAC for IP multicast are h"01:00:5e:00:00:00" to h"
01:00:5e:7f:ff:ff" And the MASK for IPMC is: h"ff:ff:ff:80:00:00".
The 6-byte of IP multicast MAC Address is stored in two 32-bit registers
• IPMCAS0
Address:h5E8
IP Multicast MAC Address Byte [3:0]
• IPMCAS1
Address:h5EC
IP Multicast MAC Address Byte [5:4]
Access: Non-Zero-Wait-State,Direct Access,Write/Read
31
IPMCAS0
MAC 3
24 23
MAC 2
16 15
IPMCAS1
11
87
MAC 1
MAC 5
0
MAC 0
MAC 4
• These two registers define the MAC address signature of IP multicast.
• Default = h" 01:00:5e:7f:ff:ff"
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