Altera DQ (ALTDQ) Manual do Utilizador descarregar pdf (Página 30)

Page 30 Ports and Parameters

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

DLL_USE_UPNDNINCLKENA

String No

Specifies whether to use the

dll_upndninclkena

port as a clock

enable for DLL counter. The values are

TRUE

FALSE

. If omitted,

the default value is

FALSE

. If the

DLL_USE_UPNDNINCLKENA

parameter is set to

TRUE

, the

DLL_USE_UPNDNINCLKENA

parameter overrides DLL control of the clock enable for DLL

counter. (1)

DQS_CTRL_LATCHES_

ENABLE

String No

Enables or disables latches for DQS delay buffer control signals.

The values are

TRUE

FALSE

. If omitted, default is

TRUE

. If the

DLL_DELAYCTRL_MODE

parameter is set to

NONE

, the

DQS_CTRL_LATCHES_ENABLE

parameter cannot be set to

TRUE

(1)

DQS_DELAY_CHAIN_

LENGTH

Integer No

Specifies number of delay buffers used in DQS delay chain. The

values are

, or

. If omitted, the default value is

. (1)

DQS_EDGE_DETECT_

ENABLE

String No

Specifies whether edge detection prevents updates to DQS delay

buffer control latches during a DQS transition. The values are

TRUE

FALSE

. If omitted, default is

FALSE

. If

DQS_CTRL_LATCHES_ENABLE

parameter is set to

FALSE

DQS_EDGE_DETECT_ENABLE

parameter cannot be set to

TRUE

. (1)

DQS_USE_DEDICATED_

DELAYCTRLIN

String No

Specifies whether the DLL directly feeds the DQS delay buffer

control signals. The values are

TRUE

FALSE

. If omitted, default

FALSE

. If the

DLL_DELAYCTRL_MODE

parameter is set to

NONE

the

DQS_USE_DEDICATED_DELAYCTRLIN

parameter cannot be set

TRUE

. If the

DQS_CTRL_LATCHES_ENABLE

parameter is set to

TRUE

, the

DQS_USE_DEDICATED_DELAYCTRLIN

parameter cannot

be set to

FALSE

. (1)

DQSN_MODE

String No

Specifies whether to use the

dqsb_padio

port. The values are

NONE

INPUT

OUTPUT

, or

BIDIR

. If omitted, default is

NONE

. If the

DQS_CTRL_LATCHES_ENABLE

parameter is set to

TRUE

, the

DQS_USE_DEDICATED_DELAYCTRLIN

parameter cannot be set to

FALSE

. (1)

GATED_DQS

String No

Specifies whether to AND DQS output with a register clocked by

delayed

DQS

signal. The values are

TRUE

FALSE

. If omitted,

default is

FALSE

. The

GATED_DQS

parameter can only be used

when the

DQSN_MODE

parameter is set to

NONE

OUTPUT

. (2)

DELAY_CHAIN_MODE

String No

Specifies delay chain mode. (1) There are two modes:

■ DLL Feedback Loop Counter used to control the DQS/nDQS

delay chains

■ No DLL used

DQS_DELAY_CHAIN_

SETTING

Integer No

Specifies value of delay chain. The legal values range from

through

. The

DQS_DELAY_CHAIN_SETTING

parameter is

ignored if the

HAS_DQS_DELAY_REQUIREMENT

parameter is

specified to

TRUE

. (3)

DQS_DELAY_REQUIREMENT

String No

Specifies delay requirement value. This parameter is available only

if the

HAS_DQS_DELAY_REQUIREMENT

parameter is specified to

TRUE

HAS_DQS_DELAY_

REQUIREMENT

String No

Specifies whether to use a delay requirement. The values are

TRUE

FALSE

. If omitted, the default value is

FALSE

Table 19. ALTDQS Megafunction Parameters (Part 3 of 4)

Parameter Type Required Description

1 2 ... 25 26 27 28 29 30 31

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