ADDER X-SC Uživatelský manuál stáhnout pdf (Strana 16)

16 CHAPTER 1. INTRODUCTION TO THE ALLIANCE TOOLS

named mux in and that we want the output pattern ﬁle generated by the simulation to be named mux out

(Note that no extension is used with either of the ﬁle names used in the command line tools of Alliance). As

noted in this output the behavioral ﬁle is compiled, ASIMUT searches for the input pattern ﬁle, links the ﬁles

and executes them at the intervals indicated in the input pattern ﬁle. The design ﬂow up to this point using

ASIMUT is shown in Figure 1.4.

Figure 1.4: Simulating the b e havioral design ﬁle using ASIMUT.

We can again open and display the output ﬁle mux out.pat with xpat. This time the output signal q also

displays as shown in Figure 1.5. This signal has b ee n derived from the behavioral description of the circuit and

the values assigned to c, a and b. We can check that the multiplexer circuit behaves as expected passing b to

output q when c is 0 and a when c is 1. It is possible also to indicate in the input pattern ﬁle if the last values

Figure 1.5: The mux out.pat shown by xpat.

in the simulation must be saved to use them as initial values of the circuit in subsequent simulations. In this

case we just add one line with save; before end; of the input pattern ﬁle. Let’s try this using a modiﬁed copy

of our previous input pattern ﬁle (only the last three lines of muxs in.pat are shown).

<+1 ns> : 10 110 ?*;

<+1 ns> c_a_b : 10 111 ?*;

<+1 ns> : 10 111 ?*;

save;

end;

When using this input pattern ﬁle the output of the simulation will be the same, but this time an additional

ﬁle named with the same input pattern ﬁle name and extension .sav will be generated. Using this .sav ﬁle we

can set the initial conditions of a circuit before running the simulation with any other input pattern ﬁle.

The options in ASIMUT are shown in Table 1.1. The .ext extension is the extension speciﬁed by the

environment variable VH

DLYSFX. We can check its value as follows.

% env | grep VH

VH_MAXERR=10

VH_BEHSFX=vbe

VH_PATSFX=pat

VH_DLYSFX=dly

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 86 87

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