Changes for page ESO to VHDL Testbench

Last modified by Richard Kreissig on 2023/09/14 11:12
<
From version < 4.1 >
edited by gjo
on 2013/07/04 12:07
To version < 6.1 >
edited by gjo
on 2013/07/04 15:07
>
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -2,15 +2,15 @@
2 2  
3 3  ----
4 4  
5 -The testbench is a VHDL file wich is used by ISE Simulator to test a VHDL component.
5 +The testbench is a VHDL file which is used by ISE Simulator to test a VHDL component.
6 6  
7 7  ISE is a programming an simulation tool to develop XILINX FPGAs. This work suite include a programminng workspace, a compiler, simulator (ISIM) and much more.
8 8  
9 -When you program a new component, aou also want to test its behavior. But you always have an FPGA, so you can use a simulator. So that the simulator knows what input signals to simulate you need a so called tesbench.
9 +When you program a new component, you also want to test its behavior. But you do not always have an FPGA, so you could use a simulator. For that the simulator knows what input signals to simulate you need a so called tesbench.
10 10  
11 -A testbench lists the component you want to test e.g. abo. (You have written a vhdl file which behaves like ABO and this component is also called abo). And it instantiate this componant as a Unit Under Test (UUT). This component (uut) will be tested with the input and outputs you have specified later in a test process.
11 +A testbench lists the component you want to test e.g. abo. (You have written a vhdl file which behaves like ABO and this component is also called abo). It instantiate this componant as a Unit Under Test (UUT). This component (uut) will be tested with the input and outputs you have specified in a test process.
12 12  
13 -At first a testbench code example from ABO for better understanding.
13 +At first a testbench code example from ABO is shown for better understanding.
14 14  
15 15  {{code linenumbers="true"}}
16 16  --/*****************************************************************************/
... ... @@ -66,7 +66,6 @@
66 66  constant tick_period : time := 100 ns;
67 67  
68 68  BEGIN
69 -
70 70   uut: abo PORT MAP(
71 71   tick => tick,
72 72   reset => reset,
... ... @@ -80,7 +80,6 @@
80 80   B_out => B_out
81 81   );
82 82  
83 -
84 84   tick_process: process
85 85   begin
86 86   tick <= '0';
... ... @@ -89,7 +89,6 @@
89 89   wait for tick_period/2;
90 90   end process;
91 91  
92 -
93 93   -- Stimulus process
94 94   stim_proc: process
95 95   begin
... ... @@ -97,7 +97,6 @@
97 97  
98 98   --sim Process
99 99  
100 -
101 101   --NEW TRACE
102 102   reset <= '1';
103 103   wait for tick_period;
... ... @@ -215,12 +215,12 @@
215 215  Line 55: instantiation of uut
216 216  
217 217  (% style="margin-left: 30.0px;" %)
218 -Here ABO is instantiated
214 +Here is ABO instantiated
219 219  
220 220  Line 69: tick process
221 221  
222 222  (% style="margin-left: 30.0px;" %)
223 -The tick process simulates the tick. This signal is a kind of clock signal. Its cycle duration is set in variable tick_period.
219 +The tick process simulates the tick. This signal is a kind of a clock signal. Its cycle duration is set in variable tick_period.
224 224  
225 225  Line 79: the simulation process
226 226  
... ... @@ -232,9 +232,9 @@
232 232  
233 233  ----
234 234  
235 -Therefor the core ESO contains no information about input and output signals the proper SCL model is needed to generate the testbench.
231 +Therefore the core ESO contains no information about input and output signals the proper SCL model is needed to generate the testbench.
236 236  
237 -The variable declaration must fit to the used variables in the ESO file, logically.
233 +The variable declaration must conform to the used variables in the ESO file, logically.
238 238  
239 239  |=(((
240 240  SCL Model
... ... @@ -330,11 +330,11 @@
330 330  SCL file is not realy correct, will be corrected as soon as possible
331 331  {{/note}}
332 332  
333 -The lines 23 to 66 (testbench file) are generated from SCL model file. The model tells the transformation which input and output the abo component must have and the type of these variables (signals in VHDL). So the SCl file is loaded and the needed code is generated.
329 +The lines 23 to 66 (testbench file) were generated from the SCL model file. The model tells the transformation which input and output the abo component must have and the type of these variables (signals in VHDL). So the SCl file is needed for code generation.
334 334  
335 335  
336 336  
337 -The simulation process (starts at line 79) is generated using the core ESO file. How the simulation process is generated will be schown at the follwing example:
333 +The simulation process (starts at line 79) is generated using the core ESO file. How the simulation process is generated will be shown at the following example:
338 338  
339 339  |=(% colspan="1" %)(% colspan="1" %)
340 340  (((
... ... @@ -371,12 +371,8 @@
371 371  ;
372 372  {{/code}}
373 373  
374 -normally the core ESO is used, but
370 +normally the core ESO is used, but for better unterstanding we use the normal ESO trace
375 375  
376 - for better unterstanding we use the
377 -
378 - normal ESO trace
379 -
380 380  
381 381  )))|(% colspan="1" %)(% colspan="1" %)
382 382  (((
... ... @@ -403,12 +403,12 @@
403 403  
404 404  **Set inputs**
405 405  
406 -Line 2 and 3 in the testbench are setting the inpute. All (!) inputs must be set!
398 +Line 2 and 3 in the testbench are setting the inputs. All (!) inputs must be set!
407 407  
408 408  * Pure signal which are present are set to the according value, e.g. //A<=true;//
409 -* Valued signals which are present are set to thier according value e.g. //C_value <= false;// and set present //B<=true;//
410 -* ABSENT values (not listed in ESO files inputs) mus be set absent
411 -** pure singals (not listeg) e.g. K <= false
401 +* Valued signals which are present are set to their according value e.g. //C_value <= false;// and set present //B<=true;//
402 +* ABSENT values (not listed in ESO files inputs) must be set absent
403 +** pure singals (not listed) e.g. K <= false
412 412  ** valued signals e.g. //B <= false//, only the present value will be set, the valued signal is not touched
413 413  
414 414  **Wait for the tick to pass by**
... ... @@ -417,13 +417,13 @@
417 417  
418 418  **Test Outputs**
419 419  
420 -After the tick has passed by we must check if the hardware computes the correct outputs. This is done by assertions. Every (!) output must tested!
412 +After the tick has passed by we must check if the hardware computes the correct outputs. This is done by assertions. Every (!) output must be tested!
421 421  
422 -* Pure signals: Test the pure output signal according to the current ESO tick, if listed, e.g. //assert( D = true )//. If it is not specified in the trace test for absence,
423 -* Valued signals: For valued signals that are specified in the current ESO tick test the present singal and the valued signal, e.g. //assert( F = true )// and //assert( F_value = false)//
424 -* Valued signals which are not listed in the current tick in the ESO file: test only the present flag for absence (We cannot say anything about absent valued signals)
414 +* Pure signals: Test the pure output signal according to the current ESO tick, if listed in the tick, e.g. //assert( D = true )//. If it is not specified in the trace test for absence,
415 +* Valued signals: For valued signals, that are specified in the current ESO tick, test the present singal and the valued signal, e.g.// assert( F = true ) //and// assert( F_value = false)//
416 +* Valued signals, which are not listed in the current tick in the ESO file: test only the present flag for absence (We can say anything about absent valued signals)
425 425  
426 -If an assertion failed the corresponding error will be printed to a log file. The severity level tells the simulator to go on with the simulation altough an error acoored.
418 +If an assertion failed the corresponding error will be printed to a log file. The severity level tells the simulator to go on with the simulation although an error occur.
427 427  
428 428  
429 429  
Confluence.Code.ConfluencePageClass[0]
Id
... ... @@ -1,1 +1,1 @@
1 -7111257
1 +7111276
URL
... ... @@ -1,1 +1,1 @@
1 -https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/KIELER/pages/7111257/ESO to VHDL Testbench
1 +https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/KIELER/pages/7111276/ESO to VHDL Testbench

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