Altera I/O Buffer (ALTIOBUF) IP Core Bedienungsanleitung PDF herunterladen (Seite 18)

Table 8: ALTIOBUF (As Input Buffer) Parameters

This table lists the parameters for the ALTIOBUF IP core (as input buffer).

Name Required Type Description

ENABLE_BUS_HOLD No String Specifies whether the bus hold circuitry is

enabled. Values are TRUE and FALSE. When

set to TRUE, bus hold circuitry is enabled

and the previous value, instead of high

impedance, is assigned to the output port

when there is no valid input. If omitted, the

default is FALSE.

Currently, ENABLE_BUS_HOLD and USE_

DIFFERENTIAL_MODE cannot be used

simultaneously.

USE_DIFFERENTIAL_MODE No String Specifies whether the input buffer is

differential. Values are TRUE and FALSE.

When set to TRUE, the output is the

difference between the datain and datain_

b ports. If omitted, the default is FALSE.

Currently, ENABLE_BUS_HOLD and USE_

DIFFERENTIAL_MODE cannot be used

simultaneously.

USE_IN_DYNAMIC_DELAY_CHAIN No String Specifies whether the input buffer incorpo‐

rates the user-driven dynamic delay chain

in the IP core, specifically, IO_CONFIG and

an input delay cell. Values are TRUE and

FALSE. If omitted, the default is FALSE.

NUMBER_OF_CHANNELS Yes Integer Specifies the number of I/O buffers that

must be instantiated. Value must be greater

than or equal to 1. A value of 1 indicates

that the buffer is a 1-bit port and accommo‐

dates wires; a value greater than 1 indicates

that the port can be connected to a bus of

width NUMBER_OF_CHANNELS.

USE_DYNAMIC_TERMINATION_

CONTROL

No String Specifies dynamic termination control.

Values are True and False. If omitted, the

default is False.

ALTIOBUF Signals and Parameters: As Output Buffer

UG-01024

2014.12.15

Altera Corporation

I/O Buffer (ALTIOBUF) IP Core User Guide

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