FBFM2112F897CSLJLS View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

FBFM2112F897CSLJLS

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip

Intel 

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip Data Sheet

1.4

— 802.1D (2004)

— 802.1Q (2003)

— 802.1p

— 802.1s

— 802.1w

— 802.1X

Definitions

The following are terms that are relevant for the FM2112, and which

are used throughout this document to describe the features, functions,

configuration, and use of the FM2112.

Interface

Generic term referring to a single logical implementation

containing a transmit and receive data path. The FM2112

contains several interface types (XAUI, JTAG, CPU, LED, etc.).

Port

Refer to the definition of “Interface” above. Used

interchangeably with “interface”, although used more frequently

to identify a specific physical implementation - rather than a

generic logical implementation. As examples of how both are

used: “The FM2112 contains 24 10G Ethernet interfaces”; “Make

sure the port is enabled before sending data”.

XAUI

Ten-Gigabit Attachment Unit Interface, defined by the IEEE as

an interface extender for XGMII (the ten-Gigabit Media

Independent Interface).

CX4

Used generically in this document to refer to the ten-Gigabit

copper interface extensions made to XAUI (and defined by IEEE

as 10GBase-CX4) to support copper “CX4” cables. The interface

is intended to connect servers or switches over short distances

- up to 15 meters.

CSR (Register)

Control Status Register used for configuration, status reporting,

and debug.

Nexus

Intel's Terabit fully-connected non-blocking crossbar; Nexus is

used to make the Terabit non-blocking shared memory switch

element.

Queue

Conceptually, a temporary packet storage element in the shared

memory (a.k.a., FIFO). In the FM2112, each frame has multiple

queue associations in the memory, and those associations are

used for congestion management and scheduling.

Cut Through

A switching mode or architecture where the switch can begin

transmitting the packet as soon as the destination port is

known, without waiting for the end of the frame to arrive.

Store-and-Forward

A switching mode or architecture where the packet is first copied

to memory (stored) in its entirety before being delivered

(forwarded) to the destination port. This mode is typically used

to forward between ports of different speeds or to ensure frames

with bad CRC are discarded immediately.

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