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LogiBLOX Guide
Chapter 3: Understanding Attributes

Data Values

Some module attributes are assigned numeric values. Data values consist of the arithmetic base, or radix, followed by the numeric data value in the specified base. LogiBLOX only allows bases 2, 4, 8, 10, and 16. The default base is decimal and does not need to be specified. The following formats are allowed.

base#value#
decimal_value

For example, the decimal value 17 can be expressed as follows.


Binary
2#10001#

Base 4
4#101#

Octal
8#21#

Decimal
17 or 10#17#

Hexadecimal
16#11#

The following attributes require a numeric data value.

When a constant value (C Value) is specified, the precision of the value might be less than the precision of the bus; if so, it will be sign-extended on the left (toward the MSB). If the value is greater than the precision of the bus, the higher order bits are ignored. In this case, a warning is also printed.

The following table shows the valid characters for several radices.

Table 3_1 Valid Characters Using Various Base Values

Base Type
Base
Valid Data Value Characters
Binary
2
0 1 - _
Base 4
4
0 1 2 3 - _
Octal
8
0 1 2 3 4 5 6 7 - _
Decimal
10
0 1 2 3 4 5 6 7 8 9 - _
Hexadecimal
16
0 1 2 3 4 5 6 7 8 9 - _
A B C D E F a b c d e f