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UVM Monitor Help!!!

Nhatt

Hi all,

I have a SPI interface, it has three modes to transfer the data out on IO[0:7]. In SPI standard there is just IO[0] is used. QPI mode, it uses IO[3:0] and In OPI mode, the whole IO are used. When driver receives a req from sequencer, it drives that req to the interface depending on modes. The interface sometimes goes with SPI, sometimes QPI or OPI. And I want to monitor the tx data, but I dont't know how to setup the monitor to sample the data corresponding to the mode that the driver has used. Are there ways to make monitor works in the same mode with the driver?

Thank you!

  • Well, I guess there are two options: first you could make your monitor smart enough to monitor all the wires all the time, and if the values on the higher bits are zero or meaningless then you can assume that the interface is running in one of the reduced width modes. That might be easy if your design / BFM always drives X, Z or 0 on the unused lines but if you have random data on them, then you might fail to detect the right configuration.

    The alternative would be to have a way to poke the current configuration into the monitor from another part of the TB, for example if you have a monitor on the register interface, connected to UVM_REG model of the DUT, then you could detect writes for the SPI configuration and pass the info to the monitor. Or your monitor could have a pointer to the necessary UVM_REG registers so that it can figure out the current config itself, but then your monitor becomes tightly coupled to the DUT and is less re-usable across projects.

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