Altera DQ (ALTDQ) Instrukcja Użytkownika Pobierz pdf (Strona 10)

Page 10 Getting Started

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

Page 6 of the ALTDQS parameter editor is the Output Enable Registers page. Table 5

on page 10 describes options available on page 6 of the ALTDQS megafunction.

Table 5. Output Enable Registers Settings

Option Description

Supported Devices

Cyclone II

Cyclone III, Cyclone IV GX

Stratix, Stratix GX,

Stratix II, Stratix II GX, Arria GX, HardCopy II

What effect should the ‘dqs_areset’

port have on output enable registers?

Use the

dqs_areset

port to asynchronously

Preset or Clear the output-enable registers. If set

to None, the port is not instantiated and you have

the option to specify the power-up state of output

enable registers.

Yes Yes Yes Yes

What effect should the ‘dqs_sreset’ port

have on output enable registers? (1)

Use the

dqs_areset

port to synchronously

Preset or Clear output enable registers. If set to

None, the

dqs_areset

port is not instantiated.

(2)

Yes Yes Yes Yes

How should the output enable registers

power-up? (1)

If None is selected for the What effect should the

‘dqs_areset’ port have on output enable

registers?option, use this option to specify

power-up condition of output-enable registers.

Yes Yes Yes Yes

Hold output drive at high impedance for

an extra half-clock cycle when output

enable goes high

Delays DQS write mode by half a clock cycle. The

DQS transitions from Z to 0, providing a cleaner

start to sequence than a Z to 1 transition.

Yes Yes Yes Yes

Use clock enable for the output enable

Creates the

outclkena

port (if not implemented

for output enable register). Use as a clock-enable

for output enable register.

Yes Yes Yes Yes

Notes to Table 5:

(1) Cyclone II devices do not support this feature. Option is disabled when Cyclone II device family is selected.

(2) This option is not available for Stratix II devices if the Allow DQS to be disabled during read post-amble option has been selected on a previous

page of the MegaWizard Plug-In Manager (refer to Table 3 on page 7).

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 30 31

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