PRIXP425BD datasheet(41/112 Pages) INTEL

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Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Functional Signal Descriptions

Datasheet

Table 17.

System Interface

Name

Power

Reset†

Type†

Description

BYPASS_CLK

Used for test purposes only.

Must be pulled high for normal operation.

SCANTESTMODE_N

VI/PE

Used for test purposes only.

Must be pulled high for normal operation.

RESET_IN_N

Used as a reset input to the device after power up conditions have

been met. Power up conditions include the power supplies reaching

a safe stable condition and the PLL achieving a locked state and the

PWRON_RESET_N coming to an active state prior to the

RESET_IN_N coming to an active state.

PWRON_RESET_N

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

input is a 1.3-V tolerant only.

HIGHZ_N

VI/PE

Used for test purposes only.

Must be pulled high for normal operation.

PLL_LOCK

Signal used to inform external reset logic that the internal PLL has

achieved a locked state.

RCOMP

Signal used to control PCI drive strength characteristics. Drive

strength is varied on PCI address, data and control signals.

Pin requires a 34-

Ω +/- 1% tolerance resistor to ground. Refer to

Figure 12 on page 77

†

For a legend of the Type codes, see Table 4 on page 30.

Table 18.

Power Interface

Name

Type†

Description

VCC

1.3-V power supply input pins used for the internal logic.

VCCP

3.3-V power supply input pins used for the peripheral (I/O) logic.

VSS

Ground power supply input pins used for both the 3.3-V and the 1.3-V power supplies.

VCCOSCP

3.3-V power supply input pins used for the peripheral (I/O) logic of the analog

oscillator circuitry.

Require special power filtering circuitry. Refer to Figure 10 on page 76

VSSOSCP

Ground input pins used for the peripheral (I/O) logic of the analog oscillator circuitry.

Used in conjunction with the VCCOSCP pins.

Requires special power filtering circuitry. Refer to Figure 10 on page 76

VCCOSC

1.3-V power supply input pins used for the internal logic of the analog oscillator

circuitry.

Requires special power filtering circuitry. Refer to Figure 11 on page 76

VSSOSC

Ground power supply input pins used for the internal logic of the analog oscillator

circuitry. Used in conjunction with the VCCOSC pins.

Requires special power filtering circuitry. Refer to Figure 11 on page 76

VCCPLL1

1.3-V power supply input pins used for the internal logic of the analog phase lock-loop

circuitry.

Requires special power filtering circuitry. Refer to Figure 8 on page 75

VCCPLL2

1.3-V power supply input pins used for the internal logic of the analog phase lock-loop

circuitry.

Requires special power filtering circuitry. Refer to Figure 9 on page 75

† For a legend of the

Type codes, see Table 4 on page 30.

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