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17–12
Table 17–20. Supported If Statement Block Operators
Chapter 17: Gate & Control Library
Operator
>
<
()
Greater Than
Less Than
Parentheses
Operation
When writing expressions in an If Statement block, ensure that the operators are
always operating on the same types. That is, bus signals compare with and operate
with bus signals; and booleans (the 'true' or 'false' result of such operations) only
compare with and operate with booleans. In other words, the types must be the same
on either side of an operator.
Treat an If statement expression, 0 and 1, as signals rather than as booleans,
otherwise you receive an error at HDL generation of the following form:
Can't determine definition of operator "<mixed operator>" -- found 0
possible definitions
If you receive this error, carefully check the expressions specified in the If Statement
blocks.
The following examples of bad syntax give errors:
■
■
(a>b)&c , where a , b and c are all input values to the If Statement.
Here (a>b) returns a boolean ('true' or 'false') and is AND ed with signal c . This
operation is ill defined and results in the following error:
Can't determine definition of operator ""&"" -- found 0 possible
definitions
((a>b)~0)
Again (a>b) returns a boolean ('true' or 'false'). 0 is treated as a signal not a
boolean, so the hardware generation fails with an error:
Can't determine definition of operator ""/="" -- found 0 possible
definitions"
where /= is the hardware translation of the 'not equal to' operator. Here the ~0
incorrectly means 'not false', and is unnecessary. The correct syntax for this
expression is just (a>b) .
Table 17–21 shows the If Statement block parameters.
Table 17–21. If Statement Block Parameters
Name
Number of Inputs
IF Expression
Value
2–10
User Defined
Description
Specify the number of inputs to the If Statement .
Specify the if condition with any of the following operators: &, |, $, =, ~, >, <,
or (), the variables a, b, c, d, e, f, g, h, i, or j, and the single digit numerals 0,
1.
Signed Integer,
Data Bus Type
[number of bits].[]
DSP Builder Handbook
Signed Fractional,
Unsigned Integer
Single Bit, Inferred
>= 0
(Parameterizable)
Specify the bus number format that you want to use. The selected type must
be capable of expressing 0 and 1 exactly.
Specify the number of bits to the left of the binary point.
November 2013 Altera Corporation
Volume 2: DSP Builder Standard Blockset
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