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Recent content by clros

  1. C

    [SOLVED] VHDL Functions

    Hi to all, I am mainly a software developer and I do not old with VHDL. I have a doubt with functions in VHDL. I wrote my complex function in vhdl (with some for..cycle internal) and I "recall" this function from my VHDL code, when I am in a determinate state of a my FSM. My function is...
  2. C

    Question about static RAM

    Thanks KlausST and dick_freebird for response. I don't want to sound too pedantic, but I did a little experiment (my doubts arise from this). I made a static memory cell on the breadboard, with two not (I used a 74HC04). after setting the logic state 0 at the input, I leave the input wire free...
  3. C

    Question about static RAM

    Ok, I now have understand! But now I have another doubt: in the dynamic RAM cell, when the capacitor is disconnected from others circuits, it is in floating state? If it is true, in this case the static electricity is influent?
  4. C

    Question about static RAM

    Ok, but when two pass-transistor are off, the Input/output of the two NOT gate are floated and therefore subject to static electricity, there are no circuit protecting them... Could this mean anything?
  5. C

    Question about static RAM

    I have a question about static memory. The classic circuit foresees that a static memory cell is formed by two NOT gates as shown in the figure: My question is: when the pass gates (T1,T2) are off, could the static electricity present in the environment near the chip change the state of the...
  6. C

    BAT54 Through Hole

    Sure, that's what I did. But if I write here it is to ask for advice from those who already have experience and can advise me without fail.
  7. C

    BAT54 Through Hole

    Hi to all, Is there a Trough Hole version of BAT54 diode?
  8. C

    VHDL functions mistakes?

    The second function return always zero.
  9. C

    VHDL functions mistakes?

    Hi to all, Ok, I have discovered that a my function work when I do: function myConvert (A : in STD_LOGIC_VECTOR( 7 DOWNTO 0 ) ) return integer is variable output : integer := 0; begin output := 5; return output; end function; But, it do not work when I do: function myConvert (A : in...
  10. C

    72 pin SIMM pinout and circuit

    Hi see these documents: https://pinouts.ru/Memory/Simm72_pinout.shtml https://allpinouts.org/pinouts/connectors/memory/dram-simm-ecc-72-pin/ PIN 19 is Not connected or is Address10? PIN 29 is Address11 or Data16? PIN 41 is /CAS1 or Address10? And so on..
  11. C

    72 pin SIMM pinout and circuit

    Hi to all, I do not understand what is the correct pinout of the old 72 pin SIMM memories, some of the documents that I have found are conflicting for some PINs. I am creating a project to drive several SIMMs with one FPGA, could you show me some reference scheme?
  12. C

    Wrong simulation for VP0808 mosfet?

    Yes, OK. I would like to get a behavior like the one described by the simulator, in particular that the mosfet does NOT lead when Vgs is equal to GND. So I should choose a MOSFET with a fairly high Vth. Could you suggest such a component?
  13. C

    Wrong simulation for VP0808 mosfet?

    Can anyone help me, please?
  14. C

    Wrong simulation for VP0808 mosfet?

    If I understand well, for P-MOSFET, the Vgs should be less than Vth: Vgs < Vth When I connect my gate to Vdd I have Vgs = 0V When I connect the gate to GND, Vgs = -3.3V When I connect the gate to Vss, Vgs = -6.6V It is correct? In this case, my Spice model have than VTO = -3.55V. If I...
  15. C

    Wrong simulation for VP0808 mosfet?

    In this simulation (I am using multisim 14.0), the output voltage value (measured from XMM1) multimeter is: ~0V when S1 is on VDD ~0V when S1 is on GND 3.3V when S1 is on VSS But, if I make this circuit on Breadboard whit a real VP0808, it do not faithful to simulation (I have 3.3V when S1...
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