utils Package Reference

Package containing some utility functions, required for generalisation. More...

Package Body >> utils

Functions
natural	cycles_per_stage ( width: in natural stages: in natural uf: in natural )
	Function for computing the number of cycles for each pipeline stage.
integer	bits_to_encode ( x: in natural )
CONFIGURABLE_ROM	rom_content ( word: in natural cps: in natural uf: in natural stage: in natural pf: in natural 0 )
	Function to determine the content of the ROM of the \(K\) constants.

Libraries
ieee
	Standard library.

Use Clauses
std_logic_1164
	Standard 9-values logic library.
math_real
	Standard math library, required for the log2 function.

Types
CONFIGURABLE_ROM	array ( natural range <> ) of std_logic_vector
	Two-dimensional matrix type, for ROM content.

Detailed Description

Package containing some utility functions, required for generalisation.

Member Function Documentation

bits_to_encode()

integer bits_to_encode (   x in natural   )

Function

Utility function to determine how many bits are required to encode the provided argument

This function is used to determine the width of the counting value signals

cycles_per_stage()

natural cycles_per_stage (   width in natural ,   stages in natural ,   uf in natural   )

Function

Function for computing the number of cycles for each pipeline stage.

The number of cycles for each pipeline stages is a constant depending on the configuration parameters

rom_content()

CONFIGURABLE_ROM rom_content (   word in natural ,   cps in natural ,   uf in natural ,   stage in natural ,   pf in natural 0   )

Function

Function to determine the content of the ROM of the \(K\) constants.

The content of each ROM depends on the architectural patameters as well as on the pipeline stage of the specific ROM

Member Data Documentation

CONFIGURABLE_ROM

CONFIGURABLE_ROM array ( natural range <> ) of std_logic_vector

Type

Two-dimensional matrix type, for ROM content.

The ROM shape cannot be statically determined, on the other hand it must be computed according to the configuration parameters.

Warning

This definition, relying on a VHDL-2008 feature, makes the SHA-2 Workbench unsupported for simulation by Xilinx Vivado, due to the lack of support for its ISim simulator

ieee

ieee

Library

Standard library.

math_real

math_real

Package

Standard math library, required for the log2 function.

std_logic_1164

std_logic_1164

Package

Standard 9-values logic library.