450NX datasheet(20/248 Pages) INTEL

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2-8

Intel

® 450NX PCIset

2. Signal Descriptions

RSP#

Response Parity Signal

AGTL+ I/O

Parity protection on RS[2:0]#.

TRDY#

Target Ready

AGTL+ I/O

Indicates that the target of the system transaction is able to enter the data

transfer phase.

2.3.2

Third-Party Agent / MIOC Interface

The following signals provide support for an additional non-processor, third-party agent

(TPA) on the system bus. Such agents may need priority access to the system bus itself, or may

need to intervene in transactions between the processors and the Intel® 450NX PCIset.

IOGNT#

I/O Grant

LVTTL I

The IOGNT# signal has two modes: Internal Arbitration Mode and External

Arbitration Mode, selected by a bit in the MIOC’s CONFIG register. In

Internal Arbitration Mode IOGNT# is an input from another bridge device

which is requesting ownership of the BPRI# signal. In external arbitration

mode, this bridge requests BPRI# ownership from an external bridge arbiter.

IOGNT#

should be asserted by the external arbiter when this MIOC has been

granted ownership of the BPRI# signal.

IOREQ#

I/O Request

LVTTL O

The IOREQ# signal has two modes: Internal Arbitration Mode and External

Arbitration Mode, selected by a bit in the MIOC’s CONFIG register.

Internal Arbitration Mode IOREQ# is the grant to another bridge device that

is making a request for ownership of the BPRI# signal. In external arbitration

mode this signal is asserted to request ownership of the BPRI# signal.

TPCTL[1:0]

Third Party Control

LVTTL I

These signals allow an agent participating in transactions between the Intel®

450NX PCIset and another bus agent as a “third-party” to control the

responses generated by the Intel 450NX PCIset.

2.4

PCI Interface

2.4.1

Primary Bus

There are two primary PCI buses per PXB, identified as the “a” bus and the “b” bus groups.

Each signal name includes a “p”, indicating the PCI bus port; p = A or B.

The MIOC will accept the request and provide the

normal response.

reserved

–

Retry

The MIOC will generate a RETRY response.

Defer

The MIOC will generate a DEFERRED response.

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