scr1 test suite: SystemVerilog nested @ blocks are not supported
The follow SystemVerilog code fails to parse...
module test(input clk); initial begin @(posedge clk) begin $display("TEST"); end end endmodule
...with the following error...
%Error: test_nested_at_block.sv:5: syntax error, unexpected '@' %Error: Cannot continue %Error: Command Failed /usr/local/bin/verilator_bin -sv --cc test_nested_at_block.sv
#1 Updated by Wilson Snyder over 1 year ago
- Category set to Unsupported
- Status changed from New to AskedReporter
Keeping open in case I'm misunderstanding what is needed...
Verilator is not an event based simulator and requires always blocks to be synthesizable, that is remove them from the initial block. This is unlikely to get fixed even in the medium term as is a fundamental rewrite.
#2 Updated by Joel Holdsworth over 1 year ago
So here is the relevant code: https://github.com/syntacore/scr1/blob/master/src/tb/scr1_top_tb_ahb.sv#L104
Basically it reads test programs into the simulated memory, runs the CPU, until it halts, and logs the results.
Is there a way that this could be rewritten and maintain compatibility with the other simulators supported by this test-bench: ModelSim, Cadence, NCSim?
#3 Updated by Wilson Snyder over 1 year ago
- Status changed from AskedReporter to WillNotFix
Turn it into a FSM, e.g.
int load_state; initial begin load_state = 0; loader(); end always @ (posedge_clk) loader(); task loader(); if (load_state==0) begin stuff in existing initial block, e.g. open file if (need possedge loop) load_state = 1; else load_state = 2; // May fallthru to below if end else if (load_state==1) begin stuff after posedge if end_of_posedge_loop load_state = 2; end // May have been set to 2 directly above if (load_state==2) begin stuff to close file end
Of course many other ways to do something similar....
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