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  1. S

    Don't care value during simulation

    Hi, What happens to "X" - don't care values during simulation? To understand what I'm saying here's an example: in a testbench there's the following statement: we = 1'hx; then, lines after there's the following test: if (we) // do something// (there's no else branch). What's the result of...
  2. S

    Analog and digital switches/ maximum input signal frequency

    Hi, Thanks for the reply. Any link to an article that discusses how to calculate the maximum rate?
  3. S

    Analog and digital switches/ maximum input signal frequency

    That doesn't really answer my questions. Why are those circuits good?
  4. S

    Analog and digital switches/ maximum input signal frequency

    Hi, Two beginner's questions: 1. What is the differences between an analog IC and a digital IC switch? 2. How can I find the maximum frequency for the input signal of a switch? I looked through the datasheet of a switch and I couldn't find a parameter that can tell me this. I want to use a...
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    [SOLVED] pull up value on signal that has driver

    Hi, I see that there are a lot of schematics where there are pullups on pins that also have a driver. Can you do this with any signals (i usually see it on reset signals)? How weak has the pullup so the driver can still make the signal 0? Thanks
  6. S

    [SOLVED] DC/DC converter input current

    Ok, I understand the efficiency, I know what 80-90% efficiency means but what does this have to to with input current? What is the input current after all? I guessed it is the maximum current that being fed to the converter doesn't damage the device, am I wrong?
  7. S

    [SOLVED] DC/DC converter input current

    Hi, Newbie's question, I was looking at the following DC/DC converter's datasheet: https://www.murata-ps.com/data/power/uwr15wa-series.pdf and I see that there is a parameter called Iin. I'm guessing that this is the maximum input current for the device, right? Why is this dependent on the...
  8. S

    Register read/write violate access

    I'm working on Xilinx too. So, if I have a design constraint that sets the max frequency to be the frequency of the whisbone clock and the design passes synthesis without errors then I'm guaranteed stable work?
  9. S

    Register read/write violate access

    I don't want to use different edge sensitive triggers I just suggested that as a solution if there would be problems. But, I know realize that my question was a bit stupid, the fact that both transfers (read and write) occur in the same clock domain it's enough to guarantee the data is valid, right?
  10. S

    Register read/write violate access

    Hi, thanks for the response. maybe metastability was not the perfect word, I know the metastability occurs in multiple clock domain design. My question was if I have something to worry about in a design where I have the same clock (both wishbone and SPI work on the same clock).
  11. S

    Register read/write violate access

    Hi, In my code I have a register that is written with data read from SPI (register is 32bit and loaded after all the 32 bits have been read from SPI in a temp register). On the other side the register is read by the wishbone interface. My question is: do I have to worry that the data can be...
  12. S

    input never used error, although it is used

    Hi, I have the following code: always @(posedge clk) begin if (!rst_n) begin push_button_sts_d1 <= 1'b0; push_button_sts_d2 <= 1'b0; push_button_sts_d3 <= 1'b0; pb3_rst_d1 <= 1'b0; pb3_rst_d2 <= 1'b0; pb3_rst_d3 <= 1'b0; pb1_rst_d1 <=...
  13. S

    access GPIO. Southbridge's registers

    Ok, so how do I find the address allotted to it?
  14. S

    Question about the code for register file access

    Hi, A newbie's question, in the following code: module reg_file ( input wire clk, input wire wr_en, input wire [1:0] w_addr, r_addr, input wire [7:O] w_data, output wire [7:Ol r_data ) reg [7:Ol array_reg [2**1:0] ; always @(posedge clk) if (wr_en) array_reg [w_addrl <= w_data; assign...
  15. S

    access GPIO. Southbridge's registers

    I don't understand what you are talking about. Can you be more specific, please.
  16. S

    access GPIO. Southbridge's registers

    Hi, I'm trying to access the GPIO pins on a motherboard under linux, 2.6.28 kernel. I read that if I have the sysfs support for the kernel (which I do :D) all I have to do is enable the respectiv pin using:echo N > /sys/class/gpio/export and I would get a gpioN directory, but I always get...
  17. S

    access GPIO. Southbridge's registers

    Hi, I'm trying to access the GPIO pins on a motherboard under linux, 2.6.28 kernel. I read that if I have the sysfs support for the kernel (which I do :D) all I have to do is enable the respectiv pin using: echo N > /sys/class/gpio/export and I would get a gpioN directory, but I always get...
  18. S

    PCI Express Interfacing

    Yes, I already knew that, but my question was how exactly does this handshaking occur?
  19. S

    PCI Express Interfacing

    Hi, Sorry if I'm posting a little bit out of topic here but I'm kinda confused. I read about the PCIe protocol, I read the Xilinx documentation about their PCIe EP and I have a quesstion: I understand that the CPU, through the RC, controls the transfer (issuing a read or write command) but how...
  20. S

    PCI Express Interfacing

    Ok, data ready signal, but that's on the EP user interface side. The RC receives only TLPs so my question was if there's a specific TLP that signals that to him, is it DTLP that doesn't concern me, do I have to signal an interrupt...

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