PCI9060 datasheet(43/192 Pages) ETC

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SECTION 3

PCI 9080

FUNCTIONAL DESCRIPTION

©PLX Technology, Inc., 1997

Page 34

Version 1.02

3.8 VENDOR AND DEVICE ID

REGISTERS

Three Vendor and Device ID registers are supported:

•

(LOC:00h), which contains the normal Device and

Vendor IDs. This register can be loaded from the

serial EEPROM or from local processors.

•

(LOC:2Ch), which contains the Subsystem and

Subvendor IDs. This register can be loaded from the

serial EEPROM or from local processors.

•

(LOC:F0h), which contains the hardcoded PLX

Vendor and Device IDs.

3.9 DOORBELL REGISTERS

There are two 32 bit doorbell interrupt/status registers in

the PCI 9080. One is assigned to the PCI bus interface

and the other is assigned to the local bus interface.

The local processor can generate a PCI bus interrupt by

writing any number other than all zeroes to the PCI to

Local Doorbell Register (refer to Table 4-56).

A PCI host can generate a local bus interrupt by writing

any number other than all zeroes to the Local to PCI

Doorbell Register (refer to Table 4-57).

3.10 MAILBOX REGISTERS

There are eight 32 bit mailbox registers in the PCI 9080

that can be written to and read from both buses. These

registers can be used to pass command and status

information directly between local and PCI bus devices.

A local interrupt can be generated, if enabled, when the

PCI host writes to one of the first four mailbox registers.

3.11 USER INPUT AND OUTPUT

PCI 9080 supports user input and output pins, USERI

(pin 31) and USERO (pin 27), respectively. User output

data can be logged by writing to bit 16 of (LOC:ECh).

User input data can be read from bit 17. (Refer to Table

4-59.)

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