Jtag interposer
About the Jtag interposer PCB
Jtag interposer is an open source PCB design by azonenberg, published on GitHub under the BSD-3-Clause license. It is a 4-layer board measuring 20 × 31 mm, with 5 components from 4 distinct parts.
Other key parts include the LDO1117-18. By type, the board carries 2 connectors, 2 capacitors and 1 IC.
It belongs with the usb & debug tools designs in this gallery.
From the project
FPGA based dumper for flashes and more
1.0V shunt resistor is missing a zone fill. Will monitor droop under load and see if we need to add top layer power path. U33 is way too close to J10. Seems to have fit OK, not touching for now, but tough to assemble. INITB and PROGB on FPGA are 1.8V signals but we try to drive with 3.3 from supervisor! Rework: add pull to 1.8V on board, open drain in super firmware JTAG connector VCC is connected to 3.3V. We need to supply 1.8 here. Temporary workaround: six pin extension cable, pass through JTAG + GND and supply 1.8V to dongle externally. Long term fix: interposer board * DONE on FPGA is…
Main components on the Jtag interposer
Jtag interposer bill of materials (BOM)
5 components, 4 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LDO1117-18 | SOT223-4 | U1 |
| 1 | XILINX_JTAG_ICESIDE | XILINX_JTAG_PTH_MOLEX_0878311420 | J1 |
| 1 | XILINX_JTAG | XILINX_JTAG_PTH_MOLEX_0878311420 | J2 |
| 2 | 4.7 uF | EIA_0603_CAP_NOSILK | C1, C2 |
Jtag interposer design files
The KiCad project lives in the azonenberg/dumptruck repository on GitHub; these links point at the commit this page was built from.
Jtag interposer: common questions
How big is the Jtag interposer PCB?
The Jtag interposer measures 20 × 31 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Jtag interposer?
5 components, from 4 distinct parts. The full bill of materials is listed on this page.
Where can I download the Jtag interposer design files?
From the azonenberg/dumptruck repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Jtag interposer design in my own project?
Yes, under the terms of its BSD-3-Clause license, which azonenberg chose for the repository.
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