FBFM2112F897CSLJLS View Datasheet(PDF) - Intel
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FBFM2112F897CSLJLS Datasheet PDF : 169 Pages
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Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip Data Sheet
3.5.1.5
3.5.1.6
Table 10. LCI_TX_LEN
Name
Bit
Switch Mode
31
Packet Length
RSVD
15:0
31:16
Description
Type
x0 – Lookup mode – The switch uses the
RW
resources of the packet processor to forward
the packet, behaving as an ordinary port,
and subject to all policy checks of an ordinary
port.
x1 – Directed mode - The Dmask of
LCI_TX_DMASK is used to specify the output
port. The switch does not learn or check
source addresses in this mode. A frame
forwarded in this mode should never be
discarded as a reason of policy. Though it is
ok to discard this frame for congestion
management.
Length of the packet to be transmitted.
RW
Includes length of CRC even if the switch is
adding the CRC.
Reserved. Set to 0.
RV
Default
0
0
0
Table 11. LCI_TX_DMASK
Name
Dmask
RSVD
Bit
Description
24:1
Destination bit mask of the packet to be
transmitted. If any bit of the DMASK is set,
then the frame is forwarded in directed
mode. If the DMASK=0 then the frame is
forwarded in lookup mode.
31:25; 0 Reserved. Set to 0.
Type
RW
RV
Default
0
0
Switching Modes
Frames may be transmitted in either of two modes
Directed Mode
• The frame is sent to the output ports without any applied policies.
— No VLAN, security, spanning tree, or trigger checks.
— This is a physical port, there is no canonical port resolution.
— The switch may discard these frames for congestion management
• Source addresses are not learned.
• The LCI may overwrite the CRC field with a correct CRC.
• There is no VLAN tagging or stripping
Lookup Mode
• Frame is transmitted as an ordinary packet. The CPU is indistinguishable from any
other station on the network.
• The LCI may overwrite the CRC field with a correct CRC.
Data Integrity
The LCI has CRC generation capability. This is purely a convenience for
the CPU.
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