Nonblocking can_put method
This example is a continuation of the previous example with the can_put method implemented.
Before calling the trans_out.try_put() method comp_a checks for the comp_b status by calling trans_out.can_put() method. On calling trans_out.can_put() comp_b can respond with 1 if it’s ready to accept the transaction packet, otherwise 0.
In order to add can_put() method, there are two additional steps on top of steps followed in the previous example.
1. In comp_a before calling the try_put method, Call can_put() method and check for the comp_b status
if(trans_out.can_put) begin //{ `uvm_info(get_type_name(),$sformatf(" Before calling port put method"),UVM_LOW) trans_out.try_put(trans); `uvm_info(get_type_name(),$sformatf(" After calling port put method"),UVM_LOW)end //}else `uvm_info(get_type_name(),$sformatf(" component_b is not ready to accept the packet"),UVM_LOW) |
2. Implement the can_put() method in comp_b
virtual function bit can_put(); `uvm_info(get_type_name(),$sformatf(" Inside can_put method"),UVM_LOW) `uvm_info(get_type_name(),$sformatf(" Sending can_put status as 1"),UVM_LOW) return 1; endfunction |
Simulator Output With can_put() return value 1.
UVM_INFO @ 0: reporter [RNTST] Running test basic_test... ------------------------------------------------------ Name Type Size Value ------------------------------------------------------ uvm_test_top basic_test - @1839 env environment - @1908 comp_a component_a - @1940 trans_out uvm_nonblocking_put_port - @1975 comp_b component_b - @2008 trans_in uvm_nonblocking_put_imp - @2043 ------------------------------------------------------ UVM_INFO component_a.sv(29) @ 0: uvm_test_top.env.comp_a [component_a] tranaction randomized UVM_INFO component_a.sv(30) @ 0: uvm_test_top.env.comp_a [component_a] Printing trans, --------------------------------- Name Type Size Value --------------------------------- trans transaction - @1135 addr integral 4 'he wr_rd integral 1 'h0 wdata integral 8 'h4 --------------------------------- UVM_INFO component_b.sv(33) @ 0: uvm_test_top.env.comp_b [component_b] Inside can_put method UVM_INFO component_b.sv(34) @ 0: uvm_test_top.env.comp_b [component_b] Sending can_put status as 1 UVM_INFO component_a.sv(33) @ 0: uvm_test_top.env.comp_a [component_a] Before calling port put method UVM_INFO component_b.sv(24) @ 0: uvm_test_top.env.comp_b [component_b] Inside try_put method UVM_INFO component_b.sv(25) @ 0: uvm_test_top.env.comp_b [component_b] Recived trans On IMP Port UVM_INFO component_b.sv(26) @ 0: uvm_test_top.env.comp_b [component_b] Printing trans, --------------------------------- Name Type Size Value --------------------------------- trans transaction - @1135 addr integral 4 'he wr_rd integral 1 'h0 wdata integral 8 'h4 --------------------------------- UVM_INFO component_a.sv(35) @ 0: uvm_test_top.env.comp_a [component_a] After calling port put method UVM_INFO /playground_lib/uvm-1.2/src/base/uvm_objection.svh(1271) @ 0: reporter [TEST_DONE] UVM_INFO /playground_lib/uvm-1.2/src/base/uvm_report_server.svh(847) @ 0: reporter [UVM/REPORT/SERVER]
Simulator Output With can_put() return value 0.
UVM_INFO @ 0: reporter [RNTST] Running test basic_test... ------------------------------------------------------ Name Type Size Value ------------------------------------------------------ uvm_test_top basic_test - @1839 env environment - @1908 comp_a component_a - @1940 trans_out uvm_nonblocking_put_port - @1975 comp_b component_b - @2008 trans_in uvm_nonblocking_put_imp - @2043 ------------------------------------------------------ UVM_INFO component_a.sv(29) @ 0: uvm_test_top.env.comp_a [component_a] tranaction randomized UVM_INFO component_a.sv(30) @ 0: uvm_test_top.env.comp_a [component_a] Printing trans, --------------------------------- Name Type Size Value --------------------------------- trans transaction - @1135 addr integral 4 'he wr_rd integral 1 'h0 wdata integral 8 'h4 --------------------------------- UVM_INFO component_b.sv(33) @ 0: uvm_test_top.env.comp_b [component_b] Inside can_put method UVM_INFO component_b.sv(34) @ 0: uvm_test_top.env.comp_b [component_b] Sending can_put status as 1 UVM_INFO component_a.sv(38) @ 0: uvm_test_top.env.comp_a [component_a] component_b is not ready to accept the packet UVM_INFO /playground_lib/uvm-1.2/src/base/uvm_objection.svh(1271) @ 0: reporter [TEST_DONE] UVM_INFO /playground_lib/uvm-1.2/src/base/uvm_report_server.svh(847) @ 0: reporter [UVM/REPORT/SERVER]
Output Analysis
In the second output with the return value set to ‘0’, we can see that as the return value is ‘0’ from comp_b, uvm_infos before and after the try_put method of comp_a and uvm_infos inside try_put method of comp_b are not getting executed.
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