EASY 6996M CPU Infineon Technologies, EASY 6996M CPU Datasheet - Page 64

• 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

3.2
In ADM6996M/MX, there are 3 different configurations (Normal PHY, MAC type MII and PCS type MII, CFG0) for
Port4. If Port4 is configured in normal PHY mode, then it is identical to Port0~Port3 and Port4’s MII signals are
ignored. If Port4 is configured in MAC type MII mode, it can be used for the HomePNA application and embedded
single PHY will not be used. In ADM6996M/MX, the most popular is to configure Port4 as the PCS type MII for the
router’s WAN port application. Users can see
are three different configurations (MAC type MII mode, GPSI mode and RMII, P5_BUSMD0) for connecting to
CPU’s MII/GPSI or RMII interface.
Here we dipicted two general router applications of ADM6996M/MX, one is connected to CPU with single MII and
another is connected to CPU with dual MII. In
packets will go through the same MII port. Because the CPU need to send out the packets with the registered MAC
ID to the WAN port, and this MAC ID may also come in from the LAN ports. We know the switch learning scheme
can’t permit the packets with same MAC ID input from different ports. In the ADM6996M/MX design, we use the
MAC clone and VLAN group to solve this problem. From
implementation.
Figure 6
Implementation of WAN/LAN applications on Samurai
ADM6996M/MX implements WAN/LAN application by ADM6996M/MX Special TAG functions.
Special Tag is inserted after the Ethernet SA field to allow the CPU to tell the switch how to handle the packets it
sends or to know the source port when the CPU receives a packet.
Table 43
Pream-
ble
8B
Data Sheet
DA SA Special
6B
Port4 and Port5 MII Connection
ADM6996M/MX to CPU with single MII Connection
Special Tag
6B Byte 0
TAG 0
Special
TAG 1
Byte 1
MAC
PHY
Special
TAG 2
Byte 2
P0
P0
Figure 6
MAC
PHY
P1
P1
CPU with single MII
Special
TAG 3
Byte 3
Figure
LAN Ports
6 Port Switch Core
MAC
PHY
64
P2
P2
6, we can see either LAN to WAN or WAN to LAN, the
and
MAC
MAC
MII
MII
P5
Special
TAG 4
Byte 4
Figure 9
Figure
MAC
PHY
P3
P3
Special
TAG 5
Byte 5
for more clear picture. For the Port5, there
9, users can have more details for this
WAN Port
MAC
PHY
P4
P4
VLAN
Tag
4B
SNAP Type/
6B
Revision 1.4, 2006-03-24
Function Description
Length
2B
Samurai-6M/MX
ADM6996M/MX
Data CRC
4B