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Recent content by im&u

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    1553 bit rate tolerance

    Thank you. Forgive me, this concerns the analog part of the system but I am only designing the RTL code. Does that requirement have an impact on the digital decoder? Another difficulty I am having is finding a good paper on 1553 transceivers (in order to see the transformation of the analog...
  2. I

    1553 bit rate tolerance

    Hi! I'm designing a 1553 decoder. 1553 bit rate = as in here : https://en.wikipedia.org/wiki/MIL-STD-1553 The bit rate is 1.0 megabit per second (1 bit per μs). The combined accuracy and long-term stability of the bit rate is only specified to be within ±0.1%; the short-term clock stability...
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    ovm test environment setting : hdl module vs interface

    Hi! I am a new user of ovm (I used to work with vhdl/verilog based verification methodology) I am trying to develop a verification environment for a design that communicates with an external adc( spi protocol: cs, sclk etc) I have some questions: As I need a model to emulate the behaviour of...
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    [SOLVED] shared signals in Test Benches ?

    Now I see why it didn't work for me before (it's because I declared the procedure outside the main process where I call it and that's why I got this error "Cannot drive signal "..." from procedure) Now it's working perfectly : main_tb_process: process procedure init_fpga begin a <= '0'; b <=...
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    [SOLVED] shared signals in Test Benches ?

    Thank you all for your answers. Is there any easier way to do that ? I'm trying to shorten my test bench and this way I have to put all signal names in the list when calling init_fpga (it's not easy when fpga has many inputs (30 for example)) Also I have another question: is a wait statement...
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    [SOLVED] shared signals in Test Benches ?

    Thank you for your reply. That works if fpga needs to be initialized only once, but what about the case when I want to initialize those signals (init fpga) AGAIN after running some commands ? like this : main_tb_process: process begin --initialization init_fpga; ... --command1 a <= '1'...
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    [SOLVED] shared signals in Test Benches ?

    Hi all, I'm trying to write a test bench for a fpga as follows: ... signal a : std_logic;--connected to input a of fpga signal b : std_logic;--connected to input b of fpga ... begin ... main_tb_process: process begin --initialization a <= '0'; b <= '0'; ... --command1 a <= '1'...

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