PM3351-SW datasheet(97/268 Pages) PMC

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PM3351 ELAN 1X100

DATA SHEET

PMC-970113

ISSUE 3

SINGLE PORT FAST ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

RXFloodOctets:

32-bit count of octets in valid flood frames received on this port.

RxMcstFrames:

32-bit count of valid multicast frames received on this port (i.e., the 48-bit

destination addresses of the counted frames are IEEE 802.3

Group/Functional addresses, but not the broadcast address of all-ones).

RXMcastOctets:

32-bit count of octets in valid multicast frames received on this port.

The counters maintained within the port descriptor counter structure correspond to

those required by the RMON and SNMP MIBs.

The port descriptor counter structure occupies the memory locations described in the

address map previously given. As the port descriptor counter structure is not cached, it

may be read at any time via PCI bus accesses.

Expansion Port Descriptor Table

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 1x100 devices (or compatible devices, such as the ELAN 8x10) in the

system. The expansion port descriptor table is used in conjunction with the transfer

rings by the switching firmware to transfer frames and messages to other devices within

the system.

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 ELAN 1x100 itself), only seven of the eight

expansion port descriptors are used, and the eighth descriptor is left untouched. Each

expansion port descriptor is hence effectively assigned to a logical device, with indices

ranging from 0 through 7. The expansion port descriptor structures are mapped into the

memory locations as given in the foregoing address map, with the structure

corresponding to logical device index zero being mapped into the lowest memory

address, and so on.

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

ELAN 1x100 devices. Any device that implements the same transfer protocol can be

interfaced to the ELAN 1x100 PCI bus interface and assigned an expansion port

descriptor (with the associated frame transfer queue), and the ELAN 1x100 device will

transfer frames to this device without any special considerations. A detailed description

of the frame transfer protocol, and the use of the expansion port descriptor and transfer

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