PM3350-SW View Datasheet(PDF) - PMC-Sierra
Part Name
Description
MFG CO.
'PM3350-SW' PDF : 224 Pages View PDF
ELAN 8X10
DATA SHEET
PMC-970109
ISSUE 3
PM3350 ELAN 8 X10
8 PORT ETHERNET SWITCH
FUNCTIONAL DESCRIPTION
Overview
This section will provide an overview of the PM3350 ELAN 8x10 system and internal
components, the device initialization and configuration process, the structures built and
used by the device to perform its functions, and a brief description of how packets are
switched by the device.
System Components
In order to describe the functions and operation of the ELAN 8x10 device, it is first
necessary to discuss the operating environment that is intended to be built around it. A
typical simple switching system utilizing the ELAN 8x10 device consists of:
1. The ELAN 8x10 device itself.
2. A set of DRAM devices that provide the operating memory for the ELAN 8x10,
mapped to the lowest bank of the ELAN 8x10 address space (i.e., addresses
starting at 0x000000 hex). The amount of DRAM provided is a system-
dependent parameter; the minimum amount required is 1 MB of RAM.
3. An EPROM containing the bootstrap image for the ELAN 8x10, i.e., the
operating firmware, operating parameters, and system initialization code; this
EPROM is mapped into the second lowest bank of the ELAN 8x10 memory
address space, i.e., the 4 MB address range starting at address 0x400000 hex.
The size of the EPROM is highly dependent on the operating configuration of
the ELAN 8x10, with the minimum requirement being 32 kB.
4. External transceiver devices that implement the PHY layer functions required for
10BaseT Ethernet.
5. An LED register, connected to a bank of eight LEDs, that may be used to report
status information for diagnostic purposes if required. The LED register is
mapped into the third bank of ELAN 8x10 memory address space, starting at
0x800000 hex.
6. A system voltage monitor or other means of asserting a system reset for a
specified time after the power supply voltage has stabilized, plus, if necessary, a
pushbutton switch for forcing a system reset after power-up.
7. A set of pull-up and pull-down resistors that are connected to the ELAN 8x10
data bus in order to drive device configuration information on to the data bus
during system reset.
Note that the above system description assumes, for simplicity, a single ELAN 8x10
device in the system. Multiple devices may be interconnected via the PCI expansion
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY
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