Altera ALTPLL (Phase-Locked Loop) IP Core Instrukcja Użytkownika Pobierz pdf (Strona 60)

DescriptionTypeParameter

Specifies whether the fbmimicbidir port is used. Values

are ON or OFF. If omitted, the default is OFF.

For Stratix III and Stratix IV device families, with the

OPERATION_MODE parameter set to ZERO_DELAY_BUFFER,

and the USING_FBMIMICBIDIR_PORT parameter is set to

OFF, you must perform the following steps:

1. Instantiate an ALT_IOBUF IP core.

2. Connect the fbout and fbin ports to the o and i ports

of the ALT_IOBUF instantiation, respectively.

3. Connect the bidirectional port of the ALT_IOBUF

instantiation to a bidirectional pin, and set the oe port

of the ALT_IOBUF instantiation to 1.

If the OPERATION_MODE parameter is set to ZERO_DELAY_

BUFFER, and the USING_FBMIMICBIDIR_PORT parameter is

set to ON, connect the fbmimicbidir port to a bidirectional

pin. This pin must be placed on the positive feedback

dedicated output pin of the PLL.

StringUSING_FBMIMICBIDIR_PORT

Specifies the scaling factor, in half-clock cycles, for which

the clock output ports must be locked before the locked

pin goes high.

IntegerVALID_LOCK_MULTIPLIER

Specifies the center value for the VCO pin. Use for

simulation purposes only.

IntegerVCO_CENTER

Specifies the integer division factor for the VCO pin. If

omitted, the default is 0. If VCO_FREQUENCY_CONTROL is set

to MANUAL_PHASE, specify the VCO frequency as a phase

shift step value; that is, one-eighth of the VCO period.

IntegerVCO_DIVIDE_BY

Specifies the integer division factor for the VCO pin. If

omitted, the default is 0. If VCO_FREQUENCY_CONTROL is set

to MANUAL_PHASE, specify the VCO frequency as a phase

shift step value; that is, one-eighth of the VCO period.

Specifies the frequency control value for the VCO pin.

Values are AUTO, MANUAL_FREQUENCY, and MANUAL_PHASE.

If omitted, the default is AUTO.

• AUTO—VCO_MULTIPLY_BY and VCO_DIVIDE_BY values

are ignored and VCO frequency is set automatically.

• MANUAL_FREQUENCY—Specifies the VCO frequency as

a multiple of the input frequency.

• MANUAL_PHASE—Specifies the VCO frequency as a phase

shift step value.

StringVCO_FREQUENCY_CONTROL

Specifies the maximum value for the VCO pin. Use for

simulation purposes only.

IntegerVCO_MAX

ALTPLL (Phase-Locked Loop) IP Core User Guide

Altera Corporation

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ALTPLL Parameters

2014.08.18

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