Altera I/O Buffer (ALTIOBUF) IP Core - Manual (Page 18)

Table 8: ALTIOBUF (As Input Buffer) Parameters
This table lists the parameters for the ALTIOBUF IP core (as input buffer).
Name Required Type Description
ENABLE_BUS_HOLD
No String Specifies whether the bus hold circuitry is
enabled. Values are
TRUE
and
FALSE
. When
set to
TRUE
, bus hold circuitry is enabled
and the previous value, instead of high
impedance, is assigned to the output port
when there is no valid input. If omitted, the
default is
FALSE
.
Currently,
ENABLE_BUS_HOLD
and
USE_
DIFFERENTIAL_MODE
cannot be used
simultaneously.
USE_DIFFERENTIAL_MODE
No String Specifies whether the input buffer is
differential. Values are
TRUE
and
FALSE
.
When set to
TRUE
, the output is the
difference between the
datain
and
datain_
b
ports. If omitted, the default is
FALSE
.
Currently,
ENABLE_BUS_HOLD
and
USE_
DIFFERENTIAL_MODE
cannot be used
simultaneously.
USE_IN_DYNAMIC_DELAY_CHAIN
No String Specifies whether the input buffer incorpo‐
rates the user-driven dynamic delay chain
in the IP core, specifically,
IO_CONFIG
and
an input delay cell. Values are
TRUE
and
FALSE
. If omitted, the default is
FALSE.
NUMBER_OF_CHANNELS
Yes Integer Specifies the number of I/O buffers that
must be instantiated. Value must be greater
than or equal to 1. A value of 1 indicates
that the buffer is a 1-bit port and accommo‐
dates wires; a value greater than 1 indicates
that the port can be connected to a bus of
width
NUMBER_OF_CHANNELS
.
USE_DYNAMIC_TERMINATION_
CONTROL
No String Specifies dynamic termination control.
Values are
True
and
False
. If omitted, the
default is
False.
ALTIOBUF Signals and Parameters: As Output Buffer
18 ALTIOBUF Signals and Parameters: As Output Buffer
UG-01024
2014.12.15
Altera Corporation I/O Buffer (ALTIOBUF) IP Core User Guide
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