PM3350-SW datasheet(152/224 Pages) PMC

152 / 224 page

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

150

Notes on PCI Configuration Register Bits:

1. Writing values into unused register bits has no effect. However, to ensure

software compatibility with future, feature-enhanced versions of the product,

unused register bits must be written with logic zero. Reading back unused bits

can produce either a logic one or a logic zero; hence unused register bits should

be masked off by software when read.

2. Except where noted, all configuration bits that can be written into can also be

read back. This allows the processor controlling the PM3350 to determine the

programming state of the block.

3. Writable PCI configuration register bits are cleared to logic zero upon reset

unless otherwise noted.

4. Writing into read-only PCI configuration register bit locations does not affect

PM3350 operation unless otherwise noted.

5. Certain register bits are reserved. These bits are associated with megacell

functions that are unused in this application. To ensure that the PM3350

operates as intended, reserved register bits must only be written with their

default values. Similarly, writing to reserved registers should be avoided.

PCI Configuration Registers

PCI configuration registers can only be accessed by the PCI host. For each register

description below, the hexadecimal register number indicates the PCI offset.

Bit

Type

Function

Default

Bit 31 to 16

DeviceID[15:0]

0x3351

Bit 15 to 0

VendorID[15:0]

0x11F8

VendorID[15:0]:

The VendorID[15:0] bits identifies the manufacturer of the device, and

contains the vendor ID assigned to PMC-Sierra by the PCI SIG.

DeviceID[15:0]:

The DeviceID[15:0] bits define the particular device, and is set to 0x3351

hexadecimal.

The DeviceID of both the PM3350 and the PM3351 are identical: 0x3351. To

distinguish between the two devices, a PCI memory read can be done to a

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