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Altera® provides several VHDL packages for use with the Quartus® II software. All packages are located in subdirectories of the \quartus\libraries\vhdlnn directory, where nn is "87" or "93". These directories are created automatically during Quartus II installation. The following table lists Altera-provided Quartus II packages and the subdirectories in which they are located:
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If you use more than one of these packages in a single VHDL Design File (.vhd), you must use them in the order in which they are listed in this table. |
| File: | Package: | Library: | Contents: |
|---|---|---|---|
| maxplus2.vhd | maxplus2 |
altera | Altera primitives supported by VHDL. |
| megacore.vhd | megacore |
altera | Pretested megafunctions consisting of several different design files. |
| altera_mf_components.vhd | altera_mf_components |
altera_mf | Altera megafunctions supported by VHDL. |
| std1164.vhd std1164b.vhd |
std_logic_1164 |
ieee | Standard for describing interconnection data types for VHDL modeling, and the STD_LOGIC and STD_LOGIC_VECTOR types. |
| lpm_pack.vhd | lpm_components |
lpm | LPM megafunctions supported by VHDL. |
| arith.vhd arithb.vhd |
std_logic_arith |
ieee | SIGNED and UNSIGNED types, arithmetic and relational functions for use with SIGNED and UNSIGNED types, and the conversion functions CONV_INTEGER, CONV_SIGNED, CONV_UNSIGNED, and CONV_STD_LOGIC_VECTOR. |
| signed.vhd signedb.vhd |
std_logic_signed |
ieee | Functions that allow the Quartus II software to use STD_LOGIC_VECTOR types as if they are SIGNED types.
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| unsigned.vhd unsignedb.vhd |
std_logic_unsigned |
ieee | Functions that allow the Quartus II software to use STD_LOGIC_VECTOR types as if they are UNSIGNED types.
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| numeric_std.vhd | numeric_std |
ieee | Functions defined in IEEE Standard VHDL Synthesis Packages (IEEE Std 1076.3-1997). |
| numeric_bit.vhd | numeric_bit |
ieee | Functions defined in IEEE Standard VHDL Synthesis Packages (IEEE Std 1076.3-1997). |
Altera also provides the wysiwyg library and the std library. The wysiwyg library contains packages for use with tools from other EDA vendors. The std library contains the standard and textio packages that are defined in the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual. These libraries are located in the \quartus\libraries\vhdlnn\wysiwyg and
\quartus\libraries\vhdlnn\std directories, respectively, where nn is "87" or "93".
Also, because the Quartus II software automatically specifies the current project directory as the work library, the Compiler considers any packages it creates from a project's VHDL Design Files to be in the work library.
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