Everything posted by Chris Le
Chris Le replied to Chris Le's topic in Methodology and BCL Forum1. Thanks! 2. If I don't set auto_predict then uvm_reg_bitbash_seq will be failed. If you say so, I think that is a bug of UVM 1.1d, because currently, the write() function is finished immediately without waiting the real transaction on bus monitor update. Any suggestion to fix the problem if we don't set auto_predict?
Chris Le posted a topic in Methodology and BCL ForumHi all, I got problem with uvm bitbash seq with uvm-1.1d. I found, when bitbash sequence writes a value to DUT, the desired value is not updated immediately (because auto predict is disabled at default). The desired value is only updated by uvm predictor via monitor (takes long time to update this value). Therefore, at the next get() function, the value doesnt return correctly (see the following code of uvm_bitbash_seq, line 165). 159 rg.write(status, val, UVM_FRONTDOOR, map, this); 160 if (status != UVM_IS_OK) begin 161 `uvm_error("uvm_reg_bit_bash_seq", $sformatf("Status was %s when writing to register \"%s\" through map \"%s\".", 162 status.name(), rg.get_full_name(), map.get_full_name())); 163 end 164 165 exp = rg.get() & ~dc_mask; My question is, should I enable auto_predict to update desired value immediately after writing to DUT? Why is auto_predict disabled at default? Currently, I worked around by adding #5ns delay before get() function to wait desired value is updated by predictor via monitor, but I think it is not a good way. Thanks.