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Clock Interface Signals

Signal Name Direction Description

ck Input This clock feeds a packed register or DDIO in input and output

paths when half-rate DDIOs are not used. If the Altera GPIO IP

core is in bidirectional mode and if you turn off the Separate

Input/Output Clocks parameter, this is the unique clock for

input and output paths.

ck_fr

Input

These clocks feed full-rate and half-rate DDIO in both input and

output paths when half-rate DDIOs are used. If the Altera GPIO

IP core is in bidirectional mode and if you turn off the Separate

Input/Output Clocks parameter, the input and output paths use

these clocks.

ck_hr

ck_in

Input

These clocks feed a packed register or DDIO in the input and

output path of a bidirectional Altera GPIO when half-rate

DDIOs are not used, and separate clocks are requested by

turning on the Separate Input/Output Clocks parameter.

ck_out

ck_fr_in

Input

These clocks feed full-rate and half-rate DDIOs in the input and

output paths of a bidirectional Altera GPIO when half-rate

DDIOs are used, and separate clocks are requested by turning on

the Separate Input/Output Clocks parameter. For example, ck_

fr_out feeds the full-rate DDIO in the output path.

ck_fr_out

ck_hr_in

ck_hr_out

cke Input Clock enable.

Termination Interface Signals

Signal Name Direction Description

seriesterminationcontrol Input Input from the termination control block

(OCT) to the buffers. It sets the buffer series

impedance value.

parallelterminationcontrol Input Input from the termination control block

(OCT) to the buffers. It sets the buffer

parallel impedance value.

Reset Interface Signals

Signal Name Direction Description

sclr Input Synchronous clear.

aclr Input Asynchronous clear.

aset Input Asynchronous set.

sset Input Synchronous set.

Shared Signals

The input, output, and OE paths share the same clear and preset signals.

The output and OE path shares the same clock signals.

Clock Interface Signals

ug-altera_gpio

2014.08.18

Altera Corporation

Altera GPIO IP Core User Guide

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Altera GPIO Manuel d'utilisateur Page 12

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