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- Numeric_std abstract "Numeric std numeric_std is a library package defined for VHDLThis package provides arithmetic functions for vectors. Overrides of std_logic_vector are defined for signed and unsigned arithmetic.This package defines numeric types and arithmetic functions for use with synthesis tools. Two numeric types are defined: UNSIGNED (represents UNSIGNED number in vector form) and SIGNED (represents a SIGNED number in vector form). The base element type is type STD_LOGIC. The leftmost bit is treated as the most significant bit. Signed vectors are represented in two's complement form. This package contains overloaded arithmetic operators on the SIGNED and UNSIGNED types. The package also contains useful type conversions functions.It is typically included at the top of a design unit: library ieee; use ieee.std_logic_1164.all; -- standard unresolved logic UX01ZWLH- use ieee.numeric_std.all; -- for the signed, unsigned types and arithmetic opsThe alternative numeric package ieee.std_logic_arith should not be used for new designsThis package does not provide overrides for mixing signed and unsigned functions.This package includes definitions for the following (not all of which are synthesizable):sign changing operators abs -arithmetic operators + - * / rem modNote: the second argument of /, rem, or mod must be nonzero. comparison operators > < <= >= = /=shift and rotate functions SHIFT_LEFT SHIFT_RIGHT ROTATE_LEFT ROTATE_RIGHT sll srl rol rorresize function RESIZE(v,n)Note: when increasing the size of a signed vector the leftmost bits are filled with the sign bit, while truncation retains the sign bit along with the (n-1) rightmost bits. For an unsigned vector, a size increase fills the leftmost bits with zero, while truncation retains n rightmost bits.conversion functions TO_INTEGER TO_UNSIGNED TO_SIGNEDNote: The latter two functions each require a second argument specifying the length of the resulting vector. logical operators not and or nand nor xor xnormatch function STD_MATCHNote: compares argument vectors element by element, but treats any bit with the value '-' as matching any other STD_ULOGIC value. Returns false if any argument bit is 'U', 'X', 'W', or 'Z'. special translation function TO_01Note: 'H' is translated to '1' and 'L' is translated to '0'; this function takes an optional second argument XMAP, which can be any of the std_logic values, but defaults to '0'. Any value besides 01LH in the input argument results in all bits being set to XMAP, with a warning issued.".
- Numeric_std wikiPageID "22385246".
- Numeric_std wikiPageRevisionID "528006354".
- Numeric_std hasPhotoCollection Numeric_std.
- Numeric_std subject Category:Hardware_description_languages.
- Numeric_std type Abstraction100002137.
- Numeric_std type Communication100033020.
- Numeric_std type HardwareDescriptionLanguages.
- Numeric_std type Language106282651.
- Numeric_std comment "Numeric std numeric_std is a library package defined for VHDLThis package provides arithmetic functions for vectors. Overrides of std_logic_vector are defined for signed and unsigned arithmetic.This package defines numeric types and arithmetic functions for use with synthesis tools. Two numeric types are defined: UNSIGNED (represents UNSIGNED number in vector form) and SIGNED (represents a SIGNED number in vector form). The base element type is type STD_LOGIC.".
- Numeric_std label "Numeric std".
- Numeric_std sameAs m.05szg97.
- Numeric_std sameAs Q7069648.
- Numeric_std sameAs Q7069648.
- Numeric_std sameAs Numeric_std.
- Numeric_std wasDerivedFrom Numeric_std?oldid=528006354.
- Numeric_std isPrimaryTopicOf Numeric_std.