Altera Nios II C2H Compiler Manuale Utente Scaricare il pdf (Pagina 42)

3–2 9.1 Altera Corporation

Nios II C2H Compiler User Guide November 2009

One-to-One C-to-Hardware Mapping

Table 3–1 lists the equivalent hardware structures resulting from this

function.

Assignments

A C assignment operator stores the value of an expression to a variable.

As a general rule, every assignment operator in the C code, such as =,

translates to a registered signal in hardware. The value of an assignment's

expression is calculated in one clock cycle. Figure 3–1 shows the

hardware that results from the following statement:

int sum = x + y;

Figure 3–1. Hardware Resulting from Assignment

Table 3–1. Hardware Structure for Arithmetic and Logical Operators

Line C Element Hardware Structure

while (len > 0) { while

Finite state machine with

nominal control logic. Refer to

section “Iteration Statements” on

page 3–5.

32-bit comparator

result += *a++ * *b++; +=

64-bit adder

* (pointer)

Avalon-MM master port to read

data (two total for

*a++ and

*b++). Refer to section

“Indirection Operator (Pointer

Dereference)” on page 3–16.

32-bit up-counter (two total for

*a++ and *b++)

* (multiply)

32x32=64-bit multiplier

len--; --

32-bit down-counter

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 137 138

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Altera Nios II C2H Compiler Manuale Utente Pagina 42