IXP45X datasheet(68/148 Pages) INTEL

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August 2006

Intel® IXP45X and Intel® IXP46X Product Line of Network Processors Datasheet

Document Number: 306261-004US

EX_REQ_N[3:1]

VI/H*

Signals used by external masters to gain access to the bus. An external master asserts this signal to

the internal arbiter to request access to use the expansion bus signals.

* When configured in external arbiter mode of operation, an internal pull-up will be enabled, thus

the pins will be driven to VCC

Should be pulled high through a 10-KΩ resistor when not being utilized in the system.

EX_REQ_GNT_N

When the IXP45X/IXP46X network processors are functioning as the Expansion bus arbiter, this

signal will serve as the request input from an external master. If there is an external arbiter used for

expansion bus accesses, this signal will serve as the expansion bus grant input from the external

arbiter.

Should be pulled high through a 10-KΩ resistor when not being utilized in the system.

EX_GNT_N[3:1]

b’111

Signals used by the arbiter to inform external masters that the master is now granted access to use

the bus. In response to an EX_REQ_N being asserted by an external master, the arbiter will output

the corresponding EX_GNT_N signal to inform the external master that the expansion bus is clear

for that master to utilize.

EX_GNT_REQ_N

When the IXP45X/IXP46X network processors are functioning as the Expansion bus arbiter, this

signal will serve as the grant output for an external master asserting the corresponding request. If

there is an external arbiter used for expansion bus accesses, this signal will serve as the expansion

bus request output signal to the external arbiter.

EX_SLAVE_CS_N

The expansion bus chip select input is used to determine when an external master is attempting to

access the IXP45X/IXP46X network processors’ expansion bus interface and internal memory map

of the processors.

Should be pulled high through a 10-KΩ resistor when not being utilized in the system.

EX_BURST

For inbound transfers, this signal is used to signify that a burst operation is being requested to

occur.

Should be pulled high through a 10-KΩ resistor when not being utilized in the system.

EX_WAIT_N

VO/H

Expansion bus IXP45X/IXP46X network processors wait. EX_WAIT_N is driven by the processors

when EX_SLAVE_CS_N is asserted. After the de-assertion of EX_SLAVE_CS_N, the IXP45X/IXP46X

network processors will stop driving this signal. A pull-up in the PAD IO is enabled all the time to

prevent this bus from floating or transitioning to VSS. This signal is used to hold off an external

master when the expansion interface cannot be accessed immediately. Most commonly seen when a

read access of the interface is occurring and the data has not been returned from the internal

peripheral unit to the expansion interface.

Table 16.

Expansion Bus Interface (Sheet 3 of 3)

Name

Power

Reset†

Normal

After

Reset

Until

Software

Enables

Possible

Configur

ations

After

Software

Enables

Type†

Description

Note:

This table discusses all features supported on the Intel® IXP45X and Intel® IXP46X Product Line of Network Processors. For details on feature support listed by processor,

see Table 1 on page 13.

†

For a legend of the Type codes, see Table 8 on page 43.

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