EASY 6996M CPU Infineon Technologies, EASY 6996M CPU Datasheet - Page 30

• 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

count. After 16 consecutive retransmit trials, the Samurai-6M/6MX (ADM6996M/MX) resets the collision counter.
Users can set the Back Off (see 0010
3.1.6
IPG is the idle time between any two successive packets from the same port. The value is 9.6 s for 10 Mbit/s
Ethernet and 960 ns for 100 Mbit/s fast Ethernet. For the receive end, Samurai-6M/6MX (ADM6996M/MX) is
designed to tolerate IPG gaps greater than 64 bits. For the transmit end, Samurai-6M/6MX (ADM6996M/MX) will
always transmit packets with the minimum IPG gap equal to 96 bits. If users want to shorten the transmission IPG
gap, users can enable the Short IPG function (see 000B
instruct its output MAC to transmit packets in average 92 bits IPG gap.
3.1.7
Samurai-6M/6MX (ADM6996M/MX) supports only one trunking port. If Port 3 and Port 4 Trunk (see 000B
function is enabled, Samurai-6M/6MX (ADM6996M/MX) will treat Port 3 and Port 4 as the same port to make the
bandwidth equal to 200M. When any of these two ports link fail, the Samurai-6M/6MX (ADM6996M/MX) will
automatically change the transmit path from the failed link port to linked one. Output port based load balancing is
implemented in Samurai-6M/6MX (ADM6996M/MX), without any users’ setting.
3.1.8
The Samurai-6M/6MX (ADM6996M/MX) will discard all illegal packets. These packets are
1. Undersized packets: The packets received with the length of less than 64 bytes are discarded
2. Oversized packets: The packets received with the length of more than “MAXPKTLEN” bytes are discarded.
3. CRC packets: The packets received with a wrong FCS value are discarded
4. Symbol error packets: The packets received with symbol error are discarded
5. Source violation packets: The packets received with a source violation could be discarded in some cases. See
6. VLAN violation packets: The frames received with a VLAN violation can be discarded in some cases. See
3.1.9
Samurai-6M/6MX (ADM6996M/MX) allows users to limit the traffic of the broadcast address (DA =
FFFFFFFFFFFF
packets(DA[40] = 1
Two threshold and storm enable bits (see 003B
are used to control the broadcast storm.
1. Time Scale. Samurai-6M/6MX (ADM6996M/MX) uses 50ms on a scale to meter the storm packets.
Parameter
All link ports are 100M
Not All link ports are 100M
2. Storm keeps on at least 1.6 seconds if any of the ports meet the rising threshold in the 4 consecutive 50 ms
intervals. In these 1.6 seconds, the ports meet the rising threshold and will start to discard the broadcast or
multicast packets until the 50 ms interval expires. Users could also disable Input Filter (see 000B
forward above packets to the un-congested port instead of discarding directly.
3. Storm finishes. After the 1.6-second storm period, Samurai-6M/6MX (ADM6996M/MX) will check the port that
makes the storm on. If all of these ports meet the falling threshold in the 2 consecutive 50 ms intervals and no
Data Sheet
See (0011
(Source
(VLAN
Violation) description
Violation) description.
Inter-Packet Gap (IPG)
Trunking Function
Illegal Frames
Broadcast Storm
H
, MPL) to see how to set the MAXPKTLEN value
H
) to prevent them from blocking the switch bandwidth. If users also want to limit the multicast
B
), they can set the Multicast Packet Counted into Storming Counter (see 0010
H
Rising Threshold
100M Threshold (See 003B
10M Threshold (See 003C
, BD) to disable this function.
H
and 003C
30
H
, TSIE). Then Samurai-6M/6MX (ADM6996M/MX) will
H
, STORM_EN, STORM_100_TH, STORM_10_TH)
H
H
)
)
Falling Threshold
1/2 100M Threshold
1/2 10M Threshold
Revision 1.4, 2006-03-24
Function Description
Samurai-6M/MX
ADM6996M/MX
H
H
, IF) function to
, MP) function.
H
, TE)