PM3351-SW datasheet(17/268 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

performed by jamming (colliding with) incoming packets on the 100Mb port when the

port has no free receive buffers.

Spanning tree bridging capabilities

The ELAN 1x100 is capable of supporting the 802.1d spanning tree protocol, allowing it

to interoperate with IEEE-standard transparent bridges. The spanning tree protocol is

supported by the on-chip Switch Processor unit, and does not require an external CPU

for implementation, as the actual agent may be supported on the Switch Processor on

one of the PM3350 chips.

Management and monitoring support

The ELAN 1x100 (PM3351) maintains and collects RMON port and host statistics for all

learned MAC addresses at wire rates. These statistics may be retrieved either in-band

(via SNMP agent) or out-of-band (via the expansion bus). When multiple ELAN 1x100

and ELAN 8x10 chips are present in a system, they may be configured to

intercommunicate and create a distributed MIB in a transparent manner.1

Status codes may be displayed on a set of LEDs (Light Emitting Diodes) during self-test

and operation at the system implementer's discretion. These status codes are output to

a register mapped into the ELAN 1x100 memory data bus at a specific address

location. Device failure during self-test, or specific operating conditions, may be

displayed using front-panel LEDs connected to the register.

An optional on-chip watchdog timer is provided by the ERST* output of the ELAN

1x100. The ERST* output of the device can be tied directly to the RST* input to provide

an optional system-wide watchdog reset. This facility permits the ELAN 1x100 to force

an automatic system restart whenever a fatal error is encountered during operation.

Autoconfiguration via Local PROM/EEPROM

The ELAN 1x100 automatically self-configures upon power-up using user-defined

parameters supplied in an external EPROM or EEPROM. The EPROM/EEPROM may

be connected to the memory bus and mapped to any address range; the ELAN 1x100

will automatically locate the EPROM or EEPROM and load the configuration

parameters from it. The ELAN 1x100 also contains hardware that enables it to write to

standard 3.3-volt EEPROM devices, thus permitting configuration information to be

changed dynamically.

1 The ELAN 8x10, if present in the system, can directly implement an optional on-chip SNMP agent on top

of an integral TCP/UDP/IP protocol stack, supporting SNMP and the RFC1493 bridge MIB, and supplying

SNMP access to the statistics gathered by the ELAN 1x100 (as well as the other devices in the system).

Alternatively, the system vendor may elect to disable the SNMP agent and access all chip statistics and

configuration variables directly from the expansion port.

PM3351-SW Datasheet(PDF) 17 Page - PMC-Sierra, Inc

PM3351-SW Datasheet(HTML) 17 Page - PMC-Sierra, Inc

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