Altera GPIO - Manual (Page 3)

Name Values Description
Data width 1 to 128 Specifies the data width.
Use legacy top-level port names Turn on, Turn off Reverts to ports used in Arria V, Cyclone V, and
Stratix V devices. For example,
dout
becomes
dataout_h
and
dataout_l
and
din
becomes
datain_h
and
datain_l
.
Buffer
Use differential buffer
Turn on, Turn off Allows the use of differential buffer.
Use pseudo-differential buffer Turn on, Turn off Allows the use of pseudo-differential buffer. This
option is only available when you enable the Use
differential buffer option.
Use bus-hold circuitry Turn on, Turn off Allows the use of bus-hold circuitry.
Use open-drain output Turn on, Turn off Allows the use of open-drain output.
Enable output enable port Turn on, Turn off Allows the use of OE input. This option is
available only when you set the Data Direction
option to output.
When you set the Data Direction option to
input and bidir, this option is disabled.
Enable seriestermination/
paralleltermination ports Turn on, Turn off Allows the use of the
seriestermination
/
paralleltermination
ports of the output
buffer.
Registers
Register mode
none, Simple
register, DDIO
This setting specifies the register mode for the
Altera GPIO IP core. The values for this
parameter are:
• none—specifies a simple wire connection
from/to the buffer.
• Simple register—specifies that the DDIO is
used as a simple register in single data-rate
mode (SDR). The Fitter may pack this register
in the I/O.
• DDIO— specifies that the IP core uses the
DDIO.
Enable synchronous clear / preset
port
None, Clear, Preset Specifies how to implement synchronous reset
port.
Enable asynchronous clear /
preset port
None, Clear, Preset Specifies how to implement asynchronous reset
port.
Enable clock enable port Specifies whether the DDIO will have the clock
enable port exposed.
Half Rate Logic Turn on, Turn off Allows the Altera GPIO IP core to use half rate
logic (half-rate DDIO).
ug-altera_gpio
2014.08.18
Parameter Settings 3
Altera GPIO IP Core User Guide Altera Corporation
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