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Altera Corporation 2–19
April 2007 Designing with Low-Level Primitives User Guide
Primitive Reference
ALT_IOBUF_DIFF
This primitive allows you to name and connect positive and negative pins
when a differential I/O standard is used for a bidirectional pin. You can
assign I/O standard, location, drive strength (current strength), slew rate,
and termination assignments, enable bus hold circuitry, and enable weak
pull-up resistor on the bidir pins. An attempt to set any other parameter
will result in an error.
Table 2–8 lists the ports and parameters of the ALT_IOBUF_DIFF
primitive, and their respective descriptions and possible values.
Table 2–8. ALT_IOBUF_DIFF Ports and Parameters (Part 1 of 2)
Port/Parameter Description/Value
Input Port
i
Connect this port to the logic in the design that generates the output signal.
oe
Connect this port to the tri-state output enable logic.
Output Ports
o
Connect this port to the logic in the design that receives the input signal.
Bidirectional Port
io
This port represents the positive pin of a differential I/O standard.
Connect this port to the device’s
bidir pin or an entity bidir port. There
must be no logic between the
io port and the chip bidir port.
iobar
This port represents the negative pin of a differential I/O standard.
Connect this port to the device’s
bidir pin, or an entity bidir port. There
must be no logic between the
iobar port and the chip bidir port.
Parameter Name
io_standard
Any legal differential I/O standard value.
current_strength Any legal value of the current_strength_new QSF assignment.
location
Any legal pin location for the current device.
slew_rate
Any legal slew rate value for the current device. This value must be a positive
integer (including 0).
enable_bus_hold The ability to enable bus-hold circuitry. Current legal values are “on” and “off”.
weak_pull_up_resistor The ability to enable the weak pull-up resistor. Current legal values are “on” and
“
off”.
- User Guide 1
- UG-83105-3.0 2
- Contents 3
- About this User Guide 5
- Typographic 6
- Conventions 6
- 1. Low-Level Primitive 7
- Low-Level 8
- Primitive 8
- Examples 8
- Altera Corporation 1–3 9
- 1–4 Altera Corporation 10
- Low-Level Primitive Examples 10
- Altera Corporation 1–5 11
- Low-Level Primitive Design 11
- Using I/Os 12
- I/O Attributes 13
- Using the DFFEAS Primitive 15
- 1–10 Altera Corporation 16
- Altera Corporation 1–11 17
- 1–12 Altera Corporation 18
- Altera Corporation 1–13 19
- 1–14 Altera Corporation 20
- Altera Corporation 1–15 21
- 1–16 Altera Corporation 22
- 2. Primitive Reference 23
- ALT_OUTBUF 25
- Altera Corporation 2–5 27
- Primitive Reference 27
- ALT_OUTBUF_TRI 28
- ALT_IOBUF 30
- ALT_INBUF_DIFF 33
- 2–12 Altera Corporation 34
- Primitives 34
- ALT_OUTBUF_DIFF 35
- ALT_OUTBUF_TRI_DIFF 36
- 2–16 Altera Corporation 38
- Altera Corporation 2–17 39
- 2–18 Altera Corporation 40
- ALT_IOBUF_DIFF 41
- Altera Corporation 2–21 43
- ALT_BIDIR_DIFF 44
- 2–24 Altera Corporation 46
- ALT_BIDIR_BUF 47
- Altera Corporation 2–27 49
- CARRY and CARRY_SUM 51
- CASCADE 52
- LUT_INPUT 53
- LUT_OUTPUT 54
- Synthesis 55
- Attributes 55
- 2–34 Altera Corporation 56
- Synthesis Attributes 56
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