How to use the coverage weight option inside coverpoint?

[aneels3]

Hi @mballance,
I am trying to implement the coverage weight option within a cover point.
I need to implement the below SV implementation using PyVSC coverage.

    @vsc.covergroup
    class fcvt_s_w_cg(object):
        def __init__(self, precision, sign_typ):
            super().__init__()

            self.instr = None
            self.cp_rs1 = vsc.coverpoint(lambda: self.instr.rs1,
                                         cp_t=vsc.enum_t(riscv_reg_t))
            self.cp_fd = vsc.coverpoint(lambda: self.instr.fd,
                                        cp_t=vsc.enum_t(riscv_fpr_t))
            self.cp_rs1_sign = vsc.coverpoint(lambda: self.instr.rs1_sign,
                                              cp_t=vsc.enum_t(operand_sign_e))
                                   # How can I specify weight option w.r.t sign_typ here?
            self.cp_fd_sign = vsc.coverpoint(lambda: self.instr.fd_sign,
                                             cp_t=vsc.enum_t(operand_sign_e))
            self.cp_gpr_hazard = vsc.coverpoint(lambda: self.instr.gpr_hazard,
                                                cp_t=vsc.enum_t(hazard_e))
                                                

I have tried adding there but was ended up with a syntax error.
Can you help me on this?

Thanks and Regards,
Anil

[mballance]

Hi @aneels3,
Coverpoint options are configured by attaching a 'dict' to the coverpoint. The testcase below shows overriding the at_least option for one coverpoint:

pyvsc/ve/unit/test_covergroup_options.py

Lines 58 to 75 in 612de9e

	def test_coverpoint_atleast(self):
	@vsc.covergroup
	class cg(object):
	def __init__(self):
	self.with_sample(dict(
	a=vsc.uint8_t(),
	b=vsc.uint8_t()))
	self.options.at_least = 2
	self.cp1 = vsc.coverpoint(self.a, bins={
	"a" : vsc.bin_array([], 1, 2, 4, 8),
	}, options=dict(at_least=1))
	self.cp2 = vsc.coverpoint(self.b, bins={
	"b" : vsc.bin_array([], 1, 2, 4, 8)
	})

I checked the documentation and realized that it was a bit out of date, so I've made a few updates there as well.

Best Regards,
Matthew