adm6999g Infineon Technologies Corporation, adm6999g Datasheet - Page 42
adm6999g
Manufacturer Part Number
adm6999g
Description
8 Port 10/100 Mb/s + Gigabit Single Chip Ethernet Switch Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.ADM6999G.pdf
(88 pages)
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Ethernet Packet from Layer 2
Preamble/SFD
–
•
ADM6999G/GX will check packet byte 12 &13. If byte[12:13] = 8100h then this packet is a VLAN packet.
Tag Protocol TD 8100
Byte 12~13
Byte 14~15: Tag Control Information TCI
Bit[15:13]: User Priority 7~0
Bit 12: Canonical Format Indicator (CFI)
Bit[11~0]: VLAN ID. The ADM6999G/GX will use bit[3:0] as VLAN group.
•
ADM6999G/GX checks byte 12 &13 if this value is 0800h then ADM6999G/GX knows this is a TOS priority packet.
Type 0800
Byte 12~13
IP header define
Byte 14
Byte 15: Service type
Data Sheet
VLAN Packet
TOS IP Packet
Bit[7:0]: IP protocol version number & header length
Bit[7~5]: IP Priority (Precedence) from 7~0
Bit 4: No Delay (D)
Bit 3: High Throughput
Bit 2: High Reliability (R)
Bit[1:0]: Reserved
Destination
(6 bytes)
Byte 0~5
Tag Control Information
TCI
Byte14~15
Source (6 bytes) Packet length
Byte 6~11
42
(2 bytes)
Byte 12~13
LEN Length
Byte 16~17
IP Header
Byte 14~15
Data
(46-1500 bytes)
Byte 14
Routing Information
Byte 18
Rev 1.31, 2005-11-25
ADM6999G/GX
CRC (4 bytes)
–
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