IXP45X datasheet(74/148 Pages) INTEL

74 / 148 page

Package Information

August 2006

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

Document Number: 306261-004US

JTG_TDO

VO/Z

VO / Z

TRI

Output data for the IEEE 1149.1 JTAG interface.

JTG_TRST_N

VI/H

Used to reset the IEEE 1149.1 JTAG interface.

Important:

The JTG_TRST_N signal must be asserted (driven low) during power-up, otherwise the TAP controller

will not be initialized properly and the processor may be locked.

When the JTAG interface is not being used, the signal must be pulled low using a 10-KΩ resistor.

JTG_TCK

Used as the clock for the IEEE 1149.1 JTAG interface.

Table 24.

System Interface (Sheet 1 of 2)

Name

Power

Reset†

Normal

After

Reset

Until

Software

Enables

Possible

Configur

ations

After

Software

Enables

Type†

Description

BYPASS_CLK

Used for test purposes only.

Must be pulled high using a 10-KΩ resistor for normal operation.

SCANTESTMODE_N

VI/H

VI / H

Used for test purposes only.

Must be pulled high using a 10-KΩ resistor for normal operation.

RESET_IN_N

VI/H

VI / H

Used as a reset input to the device when PWRON_RESET_N is in an inactive state and once

power up conditions are met. Power up conditions include the following:

— Power supplies reaching a safe stable condition and

— The PLL achieving a locked state

PWRON_RESET_N

VI/H

V I/ H

VI / H

Signal used at power up to reset all internal logic to a known state after the PLL has achieved a

locked state. The PWRON_RESET_N signal is a 3.3-V signal.

HIGHZ_N

VI / H

Used for test purposes only.

Must be pulled high using a 10-KΩ resistor for normal operation.

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.

Table 23.

JTAG Interface (Sheet 2 of 2)

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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