Witt, Sebastian

UART16750

Hello,

I'm simulating the design using Modelsim Actel 6.6d, but I'm having an undefined value for the SOUT signal.

However, when I verified the internal signal iSOUT, it seems to be correctly.
I also verified the signal imcr_loop and it seems to be ok.

Even at the begin of the simulation, when the reset is asserted, the value of iSOUT is undefined.

I think there is a problem with the process UART_OUTREGS in the uart_16750.vhd file.


Thank you,

Regards,

Diego BOTERO
diego.botero@hotmail.com

SOUT is Undefined

Hello,
I am trying to use this core in a Spartan 6 connected to a Arm processor.  In order to get the timing of the link between the ARM processor and the Uart16750 core I wanted to know what manufacture did you base your timing interface of the Uart16750 off of?

Currently I am trying to use the TI TL16c750 datasheet as a reference for the timing interface to the Uart16750 core.  I wrote a simple test that writes to the SCR scratch register, then clears the data bus, then reads the SCR scratch register and verifies it is the data we wrote to it.  This works for a couple of writes and reads but then fails randomly.  When it fails it reads back the data that was previously written to the SCR register and not the data that was just written to it.  This is what is leading me to believe I have a timing issue and wanted to see if you can point me to the correct datasheet I should be using for the timing values of the Uart16750 interface.

Uart Timing Datasheet Manufacture

In "uart_16750.vhd"
in the process UART_LSR,
the reset value for iLSR_FIFOERR is missing.

Missing Reset Value for iLSR_FIFOERR

From what I can see in the design there is possibly no transmisson/receive tests carried out on the design as there is not a test Uart connected to the DUT uart. Is this the case or has further work been carried out here?

Clearly I can see that a complete register test is carried out, but the asynchronous testing seems to be missing from the test bench. So I would imagine this may of been carried out in hardware only? Can you advise here please.

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UART16750