Altera Nios II C2H Compiler Instrukcja Użytkownika Pobierz pdf (Strona 51)

Altera Corporation 9.1 3–11

November 2009 Nios II C2H Compiler User Guide

C-to-Hardware Mapping Reference

Figure 3–7. switch Logic

Subfunction Calls

A subfunction is a C function called from within an accelerated function.

The C2H Compiler translates subfunctions to hardware using the same

mapping rules as for the top-level function. The resulting HDL module

for the accelerated subfunction becomes a submodule of the top-level

function, as illustrated in Figure 3–8 on page 3–12.

The C2H Compiler translates the top-level function and all subfunctions

to a single hardware accelerator. The C2H Compiler creates only one

instance of the subfunction hardware logic, regardless of how many times

the subfunction is called within the top-level function. If the calling

function calls the subfunction multiple times, the subfunction logic

becomes a shared resource. However, the subfunction is a private

resource exclusive to the calling function. In other words, if multiple

separate, accelerated functions call a common subfunction, the

C2H Compiler creates separate instances of the subfunction logic.

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Altera Nios II C2H Compiler Instrukcja Użytkownika Strona 51