Altera DQ (ALTDQ) Manual do Utilizador descarregar pdf (Página 26)

Page 26 Ports and Parameters

DQ (ALTDQ) and DQS (ALTDQS) Megafunctions November 2010 Altera Corporation

Table 13 shows the output ports for the ALTDQ megafunction.

Table 14 shows the bidirectional ports for the ALTDQ megafunction.

Table 15 shows the parameters for the ALTDQ megafunction.

Table 13. ALTDQ Megafunction Output Ports

Port Name Required Description

dataout_h[]

Yes

Data sampled from the

padio

port at the rising edge of the

inclock

signal.

Output port

[NUMBER_OF_DQ - 1..0]

wide.

dataout_l[]

Yes

Data sampled from the

padio

port at the rising edge of the

inclock

signal.

Output port

[NUMBER_OF_DQ - 1..0]

wide.

Table 14. ALTDQ Megafunction Bidirectional Ports

Port Name Required Description

padio[]

Yes

Bidirectional double-data rate (DDR) port that should directly feed a bidirectional

pin in the top-level design. The size of the bidirectional port is dependent on the

NUMBER_OF_DQ

parameter.

Table 15. ALTDQ Megafunction Parameters

Parameter Type Required Description

DDIOINCLK_INPUT

String No

Specifies whether to feed the

ddioinclk

ports. The values are

DQSB_BUS

NEGATED_INCLK

. If omitted, the default value is

NEGATED_INCLK

. You can use the

DQSB_BUS

value with Stratix II

devices only.

EXTEND_OE_DISABLE

String No

Specifies whether to use the second

TRUE

FALSE

. If omitted, the default value is

FALSE

INVERT_INPUT_CLOCKS

String No

Specifies whether to invert the input clocks. The

INVERT_INPUT_CLOCKS

parameter should be used with DDR

memory. When the input clock is inverted, the first bit of data is

captured on a rising-edge clock; when the input clock in not

inverted, the first bit of data is captured on a falling-edge clock.

NUMBER_OF_DQ

Integer Yes Specifies the number of DQ pins.

OE_REG

String No

Specifies whether to register the

port. The values are

REGISTERED

UNREGISTERED

POWER_UP_HIGH

String No

Specifies the power-up condition of the I/O registers. The values

are

OFF

. If omitted, the default value is

OFF

LPM_HINT

String No

Allows you to specify Altera-specific parameters in VHDL Design

Files (.vhd). The default is

UNUSED

LPM_TYPE

String No

Identifies the library of parameterized modules (LPM) entity name

in VHDL Design Files.

INTENDED_DEVICE_FAMILY

String No

This parameter is used for modeling and behavioral simulation

purposes. Create the ALTDQ megafunction with the MegaWizard

Plug-in Manager to calculate the value for this parameter.

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