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Failing to run dsp...

metusa
Intellectual 480 points

Hi all,

I have problem about C5505 dsp. I ve designed  board. There are only one dsp, and one crystal(32khz) and their circuit components on my own pcb. I expect a signal on dsp clockout pin when I power the board, but I couldn't. But, I can see that clk_out signal on evm and usbstk while bootloading (for instance, 12mhz on evm). I conclude I missed something. I d like to ask some simple questions;

- How can I test the board in order to understand the dsp works correctly?Can anyone give an alternative way other than testing clockout?

-I want only right connection between code composer studio and my board,  and debug simple applications. I think a dsp,an oscillator and jtag interface is enough to do this. If Im wrong, what are the mininmum required components to achieve this?

-As a beginner, can anyone give some points to start board testing?

Thanks all...

  • 0
    TI__Mastermind 30110 points

    Hi metusa,

    You should confirm the supply voltages (CVDD, DVDDIO, CVDDRTC, etc) and signals on some of the critical pins of the DSP. (like RTC_XI/XO, CLK_SEL, LDOI, LDOO, DSP_LDO_EN, etc)

    Check against section 3.5 Terminal Functions of the datasheet and confirm the voltages shown in Table 3-21. Supply Voltage Terminal Functions.

    Try to connect with the JTAG emulator and then you can run tests on each pin used by DSP.

    When you power the DSP, the bootloader begins execution - checking each possible external memory for a valid boot image to copy program code from.

    During this time SYSCLK should not appear on the CLKOUT pin - on my C5505A eZdsp, I did not see SYSCLK on the CLKOUT right after power on reset.

    Hope this helps,
    Mark

  • 0 in reply to Mark M
    Intellectual 480 points

    Hi mark

    thanks you for replying

    The problem is Vdd-ana pin was not connected to analog ldo out, as you pointed supply voltages.

    best regards...