1. Testing results of PXL RDO board JTAG daisy chain
Initial design
Fiber
USB
Fiber
USB
Digilent
USB - JTAG PC
RDO
board
Schematic for Digilent USB-JTAG module PCB

2. Schematic for the PXL RDO Board JTAG daisy-chain cable

3. Initial testing with Digilent board:
This is the first opportunity to test the full compliment of 10 RDO boards.
Initial tests with the Digilent JTAG board to individual RDO boards have been and continue to be successful.
Tested at different JTAG frequencies from default (6MHz) to lowest using ISE Impact 14.5
Tested for 4, 6, 8, 10 boards (using board bypass switches on the JTAG cable)
All tests failed – errors were
Wrong number of devices found
Devices not recognized
Only some devices recognized
PXL JTAG
Daisy-chain
cable
Digilent
USB-JTAG
board

4. Since the Digilent module based design did not work for multiple boards, we tried the standard Xilinx programmer.
All RDO boards correctly recognized.
Configuration of individual boards successful in positions 5 and 10.
Flash configuration not tested.
Xilinx
USB-JTAG
programmer

5. Successful 10 RDO board JTAG daisy-chain using Xilinx USB programming module and PXL JTAG chain cable.