EASY 6996M CPU Infineon Technologies, EASY 6996M CPU Datasheet - Page 55

• Manufacturer Part Number: EASY 6996M CPU
• Description: BOARD EVAL W/CPU ADM6996M
• Manufacturer: Infineon Technologies
• Series: Samurair

Specifications of EASY 6996M CPU

• Main Purpose: Interface, Ethernet
• Embedded: No
• Utilized Ic / Part: ADM6996M
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Other names: EASY6996MCPUIN

•
Table 37
DA
01005exxxxxx
Unused
(Len*4-20) bytes
Learning the Router Port
The switch listens to the following messages in order to detect router ports with IGMP snooping
•
Once a router port is detected, it is added to the port list of all GDAs in that VLAN.
[Hardware IGMP Snooping]
1. Enable Hardware IGMP Snooping, set EEPROM register 0C
2. Hardware IGMP Default Router
•
Note: The presence of the router port is configured by Query Interval (EEPROM register 3F
•
•
Note: The router port always exists even no IGMP query is received. The group membership is maintained by
Joining a Group with IGMP Snooping
Below are two joining scenarios.
Scenario A: Host A is the first host to join a group in the segment.
•
•
•
•
[Hardware IGMP Snooping]
Samurai supports 32 IGMP membership table. Samurai will maintain IGMP membership table according to
IGMPv1/v2 protocol. If 32 IGMP membership table is full, the later incoming IGMP packets will follow “Multicast
Port-map”.
User can use Address Table Control Register command and Address Table Status Register command to access
32 IGMP membership table.
Data Sheet
Group-specific Query a router can now send a group-specific query by sending a Membership Query to the
group GDA instead of sending it to 0.0.0.0
IGMP Membership query send to 01-00-5e-00-00-01
If EEPORM register 0C
If EEPORM register 0C
If EEPROM register 3F
Host A sends an unsolicited IGMP Membership report.
The switch intercepts the IGMP membership report that sent by the host that wanted to join the group.
The switch creates a multicast entry for that group and links it to the port on which it has received the report
and to all router ports.
The switch forwards the IGMP report on to all router ports. This is so that the router will also receive the IGMP
report and will update its multicast routing table accordingly.
length of time that must pass before the Router Port decides there is no longer another multicast router which
should be the querier.
Robust Variable (EEPROM register 3F
Default Router decides there are no members of a group on a network.
IPV4/IGMP/Group-Specific Query
SA
6 bytes
TP
8’h11
H
H
H
[5:0], Default Router Port-map
[0]=0, Samurai will learn the router port automatically.
[0]=1, Samurai will learn the router port according to the Default Router Port-map.
Type
16’h0800
Unused
3 bytes
Ver
4’h4
GA
4 bytes
H
[7:6]) defined as the amount of query that must pass before the
Len
4 bits
55
TOS
1 byte
H
[1]=1
Unused
7 bytes
Protocol
8’h02
Revision 1.4, 2006-03-24
Function Description
H
[15:8]) defined as the
Unused
6 bytes
Samurai-6M/MX
ADM6996M/MX
DIP
4 bytes