Package: NUMERIC_STD_UNSIGNED
- File: numeric_std_unsigned.vhdl
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| CopyRightNotice | STRING | "Copyright 2008 IEEE. All rights reserved." |
Functions
- find_leftmost (ARG : STD_ULOGIC_VECTOR;
Y : STD_ULOGIC) return INTEGER
Description
Result subtype: STD_ULOGIC_VECTOR(R'LENGTH-1 downto 0)
Result: Computes "L mod R" where R is an UNSIGNED vector and L
is a non-negative INTEGER.
If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
Id: A.39
- find_rightmost (ARG : STD_ULOGIC_VECTOR;
Y : STD_ULOGIC) return INTEGER
Description
Result subtype: INTEGER
Result: Finds the leftmost occurrence of the value of Y in ARG.
Returns the index of the occurrence if it exists, or -1 otherwise.
Id: A.41
- MINIMUM (L,
R : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: BOOLEAN
Result: Computes "L /= R" where L is an UNSIGNED vector and
R is a non-negative INTEGER.
Id: C.37
- MINIMUM (L : NATURAL;
R : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR
Result: Returns the lesser of two UNSIGNED vectors that may be
of different lengths.
Id: C.39
- MINIMUM (L : STD_ULOGIC_VECTOR;
R : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR
Result: Returns the lesser of a nonnegative INTEGER, L, and
an UNSIGNED vector, R.
Id: C.41
- MAXIMUM (L,
R : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR
Result: Returns the lesser of an UNSIGNED vector, L, and
a nonnegative INTEGER, R.
Id: C.43
- MAXIMUM (L : NATURAL;
R : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR
Result: Returns the greater of two UNSIGNED vectors that may be
of different lengths.
Id: C.45
- MAXIMUM (L : STD_ULOGIC_VECTOR;
R : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR
Result: Returns the greater of a nonnegative INTEGER, L, and
an UNSIGNED vector, R.
Id: C.47
- SHIFT_LEFT (ARG : STD_ULOGIC_VECTOR;
COUNT : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC
Result: Computes "L /= R" where L is an UNSIGNED vector and
R is a nonnegative INTEGER.
Shift and Rotate Functions
Id: S.1
- SHIFT_RIGHT (ARG : STD_ULOGIC_VECTOR;
COUNT : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR(ARG'LENGTH-1 downto 0)
Result: Performs a shift-left on an UNSIGNED vector COUNT times.
The vacated positions are filled with '0'.
The COUNT leftmost elements are lost.
Id: S.2
- ROTATE_LEFT (ARG : STD_ULOGIC_VECTOR;
COUNT : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
Result: Performs a shift-right on an UNSIGNED vector COUNT times.
The vacated positions are filled with '0'.
The COUNT rightmost elements are lost.
Id: S.5
- ROTATE_RIGHT (ARG : STD_ULOGIC_VECTOR;
COUNT : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR(ARG'LENGTH-1 downto 0)
Result: Performs a rotate-left of an UNSIGNED vector COUNT times.
Id: S.6
- RESIZE (ARG : STD_ULOGIC_VECTOR;
NEW_SIZE : NATURAL) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR(ARG'LENGTH-1 downto 0)
Result: SHIFT_RIGHT(ARG, COUNT)
RESIZE Functions
Id: R.2
- RESIZE (ARG,
SIZE_RES : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR(NEW_SIZE-1 downto 0)
Result: Resizes the UNSIGNED vector ARG to the specified size.
To create a larger vector, the new [leftmost] bit positions
are filled with '0'. When truncating, the leftmost bits
are dropped.
- TO_INTEGER (ARG : STD_ULOGIC_VECTOR) return NATURAL
Description
Result subtype: STD_ULOGIC_VECTOR (SIZE_RES'length-1 downto 0)
Conversion Functions
Id: D.1
- To_StdLogicVector (ARG,
SIZE : NATURAL) return STD_LOGIC_VECTOR
Description
Result subtype: NATURAL. Value cannot be negative since parameter is an
UNSIGNED vector.
Result: Converts the UNSIGNED vector to an INTEGER.
Id: D.3
- To_StdLogicVector (ARG : NATURAL;
SIZE_RES : STD_ULOGIC_VECTOR) return STD_LOGIC_VECTOR
Description
Result subtype: STD_LOGIC_VECTOR(SIZE-1 downto 0)
Result: Converts a non-negative INTEGER to an UNSIGNED vector with
the specified SIZE.
- To_StdULogicVector (ARG,
SIZE : NATURAL) return STD_ULOGIC_VECTOR
Description
Id: D.5
- To_StdULogicVector (ARG : NATURAL;
SIZE_RES : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR
Description
Result subtype: STD_ULOGIC_VECTOR(SIZE-1 downto 0)
Result: Converts a non-negative INTEGER to an UNSIGNED vector with
the specified SIZE.