Altera RAM-Based Shift Register Instrukcja Użytkownika Pobierz pdf (Strona 23)

Chapter 3: Specifications 3–3

Ports and Parameters for the ALTSHIFT_TAPS Megafunction

May 2013 Altera Corporation RAM-Based Shift Register (ALTSHIFT_TAPS) Megafunction User Guide

Table 3–3 shows the ALTSHIFT_TAPS megafunction parameters.

Table 3–3. Shift Register (RAM-based) MegaWizard Plug_In Parameters

Name Type Required Description

NUMBER_OF_TAPS

Integer Yes Specifies the number of regularly spaced taps along the shift register.

TAP_DISTANCE

Integer Yes

Specifies the distance between the regularly spaced taps in clock cycles.

This number translates to the number of RAM words that will be used.

TAP_DISTANCE

must be at least 3.

WIDTH

Integer Yes Specifies the width of the input pattern.

POWER_UP_STATE

String No

Specifies the shift register contents at power-up. Values are

CLEARED

and

DONT_CARE

. If omitted, the default is

CLEARED

Value Description

CLEARED

Zero content. For Stratix and

Stratix II device families, you must

use M512 or M4K RAM blocks.

DONT_CARE

Unknown contents. M-RAM blocks

can be used with this setting.

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