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App note: Xilinx in-system programming using an embedded microcontroller

Posted on Saturday, January 4th, 2014 in app notes by DP

ap_xilinx_icsp_using_embedded_micro

Program Xilinx’ CPLDs and FPGAs with the aid from this app note.

By using a simple JTAG interface, Xilinx devices are easily programmed and tested without using expensive hardware. Multiple devices can be daisy-chained, permitting a single four-wire Test Access Port (TAP) to control any number of Xilinx devices or other JTAG-compatible devices. The four mandatory signals comprising the JTAG TAP are: Test Clock (TCK), Test Mode Select (TMS), Test Data Input (TDI), Test Data Output (TDO)
 
The processor and JTAG chain schematic shown above can help designers achieve these unprecedented benefits by providing a simple means for programming Xilinx CPLDs and FPGAs from design information stored in the embedded processor memory space. This design can be modified for remote downloading applications and the included reference C code can be compiled for the designer’s processor of choice.
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2 Responses to “App note: Xilinx in-system programming using an embedded microcontroller”

  1. This is why I now use Lattice MachXO2 devices. Instant-on internal flash that you can program in-circuit from the factory and beyond with I2C.

  2. mossmann says:

    This is how we program the CPLD on HackRF. We decided that the xapp058 software license situation, though murky, is acceptable based on Ian’s efforts. Thanks, Ian!

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