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[Testing] Properly randomize exokay for random subordinate #42

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Merged
micprog merged 1 commit into from
Aug 3, 2026
Merged

[Testing] Properly randomize exokay for random subordinate #42

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32 changes: 28 additions & 4 deletions src/test/obi_test.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -192,7 +192,6 @@ package obi_test;
string name;
obi_driver_t drv;
addr_t a_queue[$];
logic r_queue[$];

function new(
virtual OBI_BUS_DV #(
Expand Down Expand Up @@ -328,7 +327,7 @@ package obi_test;
obi_driver_t drv;
addr_t a_queue[$];
id_t id_queue[$];
logic r_queue[$];
logic is_excl_queue[$];

function new(
virtual OBI_BUS_DV #(
Expand Down Expand Up @@ -366,31 +365,56 @@ package obi_test;
automatic logic [ ObiCfg.DataWidth-1:0] a_wdata;
automatic logic [ ObiCfg.IdWidth-1:0] a_aid;
automatic obi_a_optional_t a_optional;
automatic logic is_excl;

this.drv.recv_a(a_addr, a_we, a_be, a_wdata, a_aid, a_optional);
this.a_queue.push_back(a_addr);
this.id_queue.push_back(a_aid);
if (ObiCfg.OptionalCfg.UseAtop) begin
is_excl = a_optional.atop inside {obi_pkg::ATOPLR, obi_pkg::ATOPSC};
end else begin
is_excl = 1'b0;
end
this.is_excl_queue.push_back(is_excl);
end
endtask

task automatic send_rs();
forever begin
automatic logic rand_success;
automatic addr_t a_addr;
automatic logic is_excl;
automatic logic [ObiCfg.DataWidth-1:0] r_rdata;
automatic logic [ ObiCfg.IdWidth-1:0] r_rid;
automatic logic r_err;
automatic obi_r_optional_t r_optional;

wait (a_queue.size() > 0);
wait (id_queue.size() > 0);
wait (this.a_queue.size() > 0);
wait (this.id_queue.size() > 0);
wait (this.is_excl_queue.size() > 0);

a_addr = this.a_queue.pop_front();
r_rid = this.id_queue.pop_front();
is_excl = this.is_excl_queue.pop_front();

r_err = RandResp ? ($urandom() % 2) : 1'b0;
rand_success = std::randomize(r_rdata); assert(rand_success);
rand_success = std::randomize(r_optional); assert(rand_success);

if (ObiCfg.OptionalCfg.UseAtop) begin
// Requirement R13.1 and R13.2: For a LR.W/D related transaction success shall be signaled
// via exokay [...].
if (!is_excl) begin
// Requirement R13.3: Other [non-exclusive] transactions shall signal exokay = 0.
r_optional.exokay = 1'b0;
end else if (r_err) begin
// Requirement R13.4: The exokay and err signals shall [not issue {err, exokay} = 2'b11].
r_optional.exokay = 1'b0;
end else begin
r_optional.exokay = RandResp ? ($urandom() % 2) : 1'b1;
end
end

this.drv.send_r(r_rdata, r_rid, r_err, r_optional);
end
endtask
Expand Down
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