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

out again to the 24 ports on egress, permitting a non-blocking

transmission of scheduled frames, with no multicast replication

bottlenecks.

Switch Element Scheduler (SES)

The Switch Element Scheduler (SES) manages the frame data in the

switch element datapath and communicates with the frame processor

and switch element datapath. It performs a time-sliced arbitration

algorithm to schedule frames streaming across the ingress crossbar. It

then represents the frame as a linked list of pointers that may exist

anywhere in the memory, allocating pointers on ingress, and freeing

pointers on transmission. (A pointer points to a group of four

segments, allowing a maximum of 4096 packets in the switch at one

time.) The SES queues out-of-band frame information that travels

along with the packet and comes from the frame processor, and it

queues the segment pointers. It manages multicast replication, as

pointers are forwarded from an RX queue to a TX queue. Frames

marked with errors, from either the EPL or the FP, are discarded if the

frame has not yet been transmitted. If the frame has been partially

transmitted, then it is forced to have a bad CRC. The frames are

scheduled for egress transmission according to a number of selectable

algorithms, including strict priority and weighted round robin. Frames

are associated with three queues: RX port, TX port, and shared

memory. The queue status is reported to the frame processor for its

use in congestion management decisions for pause and discard.

Management (MGMT)

The Management block (MGMT) contains slow interfaces to access and

configure the device. It allows the FM2112 to communicate with a host.

There is an internal management bus that matches the slow rate of the

management interface to all of the different high-speed blocks in the

device. The management block cannot get involved with the actual line

rate forwarding activity, but it otherwise has a high degree of visibility

into the device.

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