PM3350-SW datasheet(64/224 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

In a multiple-ELAN 8x10 system, a single ELAN 8x10 may be designated as a master

and possess a boot image in an EPROM or EEPROM. This ELAN 8x10 is then

responsible for initializing and configuring all the other ELAN 8x10s in the system via

the expansion port interface. This is facilitated by the RISCRUN configuration bit

supplied on the memory data buses of all of the ELAN 8x10s in the system. In this

application, the master ELAN 8x10 should have its RISCRUN bit pulled HIGH during

reset, and all of the other slaves should have the corresponding bits pulled LOW,

ensuring that they enter standby mode The master ELAN 8x10 can then configure

itself, download boot information to the RAM interfaced to the remaining ELAN 8x10s,

and finally enable all of the slave ELAN 8x10s to start running. The slave devices can

then initialize themselves using the downloaded information.

Configuration Parameters

This section describes the various configuration parameters that can be adjusted by the

system implementer to create a boot image for various system types and options. The

configuration parameters are primarily located in a header file that is read as part of the

bootstrap image creation process.

This section is TBD.

Stand-Alone System Boot

This section describes how a stand-alone ELAN 8x10 system (i.e., one containing only

one device, or one where every ELAN 8x10 device possesses its own EPROM/

EEPROM that provides a boot image) initializes itself.

This section is TBD.

Master/Slave System Boot

The boot-up process implemented in a master/slave ELAN 8x10 system, consisting of a

single master ELAN 8x10 device and one or more slave devices, is described here. In

such a system, only the master device possesses an EPROM or EEPROM containing

the primary boot image; the slaves receive their boot images in the form of downloads

by the master device to predetermined areas of slave device external RAM.

This section is TBD

Host-Controlled System Boot

In a host-controlled system, it is expected that all of the ELAN 8x10 devices are

configured as slaves, i.e., they do not possess EPROMs or EEPROMs containing boot

images that permit them to self-configure at power-up. Instead, they enter a halt state

after system reset and wait for the host (i.e., system master processor) to download the

required boot image and enable them to begin executing it.

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