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You are correct, the rising edge of TCK captures TMS and TDI and the falling edge of TCK, TDO is valid.
Signal integrity and all transmission line theory is based on the slew rate of the drivers. That is, DV/DT, the change of voltage over the change in time. So even with a very slow TCK, a...
Hello Treqer,
We met before on this thread. https://www.edaboard.com/threads/208797/
Sorry you are having troubles. THe design is not entirely clear to me, but buffering signals introduces a host of problems. Buffering/Driving any signal (jtag or functional) over a long distance and having...
To be clear, those are limitations of the Xilinx USB pod and not a limitation of all commercial JTAG pods nor the standard itself. Please note also that USB 2.0 is half-duplex and JTAG is full-duplex. Hence there is a lot of data transfer inefficiencies in USB 2.0 based pods since they must...
Ian,
There isnt a limitation on TCK in the 1149.1 standard itself. Like any synchronous data transmission there is a limit as to how much effort will be put into the IC design. Most devices top out at 50 or 60Mhz. This is fairly reasonable throughput for a full duplex ( 50mbits/sec of data...
Hello,
Well this is confirming that your TDO is high. I don't know the mV per division on your scope but make sure TRST is low after power-up and then high. It looks like it is doing that.
Lots of spikes on your signals, again, not sure if your TCK is spikey. Any spike that the in-chip TAP...
Hello,
This typically means that there is a problem in the interface between the FlashPro and the target. Flashpro is applying both an IR (Instruction Register) check and a Data register check (DR) and both are failing. It is a bit cryptic, but typically, all FFs typically would mean that one...
This is old but, I thought I could help. These are the commands for adding user defined instructions in Synopsys. Simply specifying the register and the instruction definition will connect basics up for you.
set_bsd_configuration -ir_width 4
set_bsd_register INTERNAL -access { tdi, TEST_SI...
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