PM3350-SW datasheet(46/224 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

16 MB boundary and that the ELAN 8x10 operating firmware parameters are set

consistently with the selected base address.

Device Internal Blocks

The ELAN 8x10 consists of the following major components: a Switch Processor, eight

MAC interfaces, a DMA Controller, a memory controller and a PCI expansion port. In

addition, it also implements a watchdog reset circuit and some auxiliary functions.

Switch Processor

The Switch Processor is a 50 MHz proprietary RISC processor that executes the

firmware required for carrying out all the packet switching and device control functions

of the ELAN 8x10. It is specifically designed to support LAN protocols at high speeds in

a closed embedded system environment. The Switch Processor contains various

hardware features that permit it to carry out all of its functions at maximum efficiency,

and is tightly coupled to the rest of the ELAN 8x10 device logic

The Switch Processor interfaces to the rest of the ELAN 8x10 device via several

dedicated hardware ports:

It uses a special control register access bus to read or write any of up to 96 16-

bit control registers that are implemented by the internal hardware units; these

registers are used to set configuration parameters in various ELAN 8x10 units,

read the unit status, set various operating parameters (such as address

pointers), and perform device self-test.

It implements a set of thirteen level-sensitive hardware interrupts that are

connected to various blocks within the ELAN 8x10; these interrupts are the

primary task dispatching entity for the base switching code. Assertion of an

interrupt line causes the corresponding interrupt service routine (ISR) to begin

executing, and execution normally proceeds until the ISR has finished servicing

the unit that required attention.

A set of 32 general-purpose outputs and 15 general-purpose inputs are

provided. These are connected to various low-level control and status signals

presented by various ELAN 8x10 internal logic blocks. The general-purpose

inputs and outputs considerably speed up the testing of the state of the logic

blocks and also the control of their functions, as multiple tests on inputs or

multiple modifications of outputs can be performed in a single instruction.

A set of 16 coprocessor condition tests are implemented by the Switch

Processor. These inputs are used to signal high-level device conditions

generated by various ELAN 8x10 functional units to the Switch Processor

firmware.

PM3350-SW Datasheet(PDF) 46 Page - PMC-Sierra, Inc

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