PM3350-SW datasheet(86/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

RXBcastFrames:

32-bit count of frames received on this MAC port which were broadcast.

RXBcastOctets:

32-bit count of bytes in frames received on this MAC port which were

broadcast.

RXFloodFrames:

32-bit count of frames received on this MAC port which were flooded.

RXFloodOctets:

32-bit count of bytes in frames received on this MAC port which were flooded.

RXMcastFrames:

32-bit count of frames received on this MAC port which were multicast.

RXMcastOctets:

32-bit count of bytes in frames received on this MAC port which were

multicast.

The counters maintained within the port descriptor counter structures correspond to

those required by the RMON and SNMP MIBs.

The port descriptor counter structures occupy the memory locations described in the

address map previously given, with the port descriptor counter structure for physical

port 0 occupying the lowest address, and so on. As the port descriptor counter

structures are not cached, they may be read at any time via PCI bus accesses.

Expansion Port Descriptor Tables

A set of data structures, collectively referred to as the

Expansion Port Descriptor Table,

is associated with the PCI expansion port. The Expansion Port Descriptor Table

consists of eight 16-byte

expansion port descriptors, each representing one of the (at

most) eight ELAN 8x10 (or compatible) devices in the system, along with an associated

set of eight

frame transfer queues that contain frames pending to be transferred to the

particular device. As noted, a single expansion port descriptor and the corresponding

frame transfer queue is assigned to each device present on the PCI bus; as there can

be at most seven external devices (i.e., excluding the device being considered), only

seven of the eight expansion port descriptors are used, and the eighth descriptor is left

untouched.

Note that the use of the expansion port descriptors is not limited to communicating with

ELAN 8x10 devices. Any device that implements the same transfer protocol can be

interfaced to the ELAN 8x10 PCI bus interface and assigned an expansion port

descriptor (with the associated frame transfer queue), and the ELAN 8x10 device will

transfer frames to this device without any special considerations.

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