DM9008F Просмотр технического описания (PDF) - Davicom Semiconductor, Inc.

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DM9008F

ISA/Plug & Play Super Ethernet Contoller

Davicom Semiconductor, Inc. 

APPENDIX B

Plug and Play Function Descriptions

DM9008 Configuration Modes

DM9008 is power-on in jumperless mode.

DM9008's resource configuration information, such as I/O

base address, BROM memory base address, interrupt request

line, etc., are stored in the CONFIGA-D registers, as well as in

the PnP logical device configuration registers. Their power-up

default values may come from the contents of 9346 in PnP and

DM jumperless modes. Their values can be modified by

software via the logical device configuration registers in DM

Jumpless and PnP modes. The update values will also be

recorded to the CONFIGA-D registers. This new configuration

is only valid temporarily, and will be lost after an active PC

Hardware Reset. Permanent changes to the configuration

must be done by either changing the jumper state or the

DM9008

ISA/Plug & Play Super Ethernet Contoller

contents of 9346. Note that the BROM size cannot be modified

temporarily.

The Plug and Play logic can work in both configuration modes

if using a DM, instead of the PnP, Initiation Key. In other words,

the DM Initiation Key is supported in all configuration modes,

whereas the PnP Initiation key is only supported in PnP mode.

By using the DM Initiation Key, the software can put DM9008 in

the PnP Config state and access the logical device

configuration registers even if DM9008 is in Jumpless mode.

The differences between the 2 configuration modes are shown

in the following table.

Configuration Mode

DM Jumperless

Plug and Play

Resource of Power-up Value

9346

9346

Supported Initiation Key

DM Initiation Key

DM and PnP Initiation Key

Final

63

Version: DM9008-DS-F02

November 30, 2000

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