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Azmogod's avatar
Azmogod
Icon for New Contributor rankNew Contributor
5 years ago
Solved

MAX IIZ JTAG Programming

Hello, I am new to FPGA / CPLD and im having some problems with my project. I am trying to program a CPLD (EPM240ZM68C7) using a USB Blaster and Quartus Prime. Ive been having problems with messag...
  • JohnT_Altera's avatar
    JohnT_Altera
    5 years ago

    Hi,


    1) This version of CPLD my VCCINT is supplied by 1.8V and VCCIO (Bank 1

    and 2) with 3.3V. The pin 4 on the JTAG connector, should be attached to

    the 1.8V or 3.3V?

    The pin 4 should be attach to 3.3V as the input and output buffer is provided by VCCIO pin.


    2) Some datasheets say that the TMS should have a 10k pull-up resistor

    and TCK should have a pull-down resistor of 10k and some 1k. Which one

    is correct for TCK, 10k or 1k?

    It should be 10K pull-up on TMS and 1K pull-down for TCK. Please refer to https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/max2/max2_mii51013.pdf - Figure 11–1


JohnT_Altera's avatar
JohnT_Altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


1) This version of CPLD my VCCINT is supplied by 1.8V and VCCIO (Bank 1

and 2) with 3.3V. The pin 4 on the JTAG connector, should be attached to

the 1.8V or 3.3V?

The pin 4 should be attach to 3.3V as the input and output buffer is provided by VCCIO pin.


2) Some datasheets say that the TMS should have a 10k pull-up resistor

and TCK should have a pull-down resistor of 10k and some 1k. Which one

is correct for TCK, 10k or 1k?

It should be 10K pull-up on TMS and 1K pull-down for TCK. Please refer to https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/max2/max2_mii51013.pdf - Figure 11–1


  • Azmogod's avatar
    Azmogod
    Icon for New Contributor rankNew Contributor
    5 years ago
    Thank you so much for the answers. I am having problems to program my CPLD but i believe it is a bad soldering (uBGA) since when i check the signals on the oscilloscope, my TCK is fine, my TDI is fine but my TDO is always at low. I have only one device on the JTAG Chain, so it could only be this specific device.