Nonblocking can_get method
This example is a continuation of the previous example with the can_get method implemented.
Before calling the trans_in.try_get() method comp_b checks for the comp_a status by calling trans_in.can_get() method. On calling trans_in.can_get() comp_a can respond with 1 if it’s ready to send the transaction packet, otherwise 0.
In order to add can_get() method, there are two additional steps on top of steps followed in the previous example.
1. In comp_b before calling the try_get method, Call can_get() method and check for the comp_a status
if(trans_in.can_get) begin //{ `uvm_info(get_type_name(),$sformatf(" component_a can send the transaction"),UVM_LOW) `uvm_info(get_type_name(),$sformatf(" Requesting transaction."),UVM_LOW) `uvm_info(get_type_name(),$sformatf(" Before calling port get method"),UVM_LOW) if(trans_in.try_get(trans)) begin //{ `uvm_info(get_type_name(),$sformatf(" recived transaction from get method"),UVM_LOW) `uvm_info(get_type_name(),$sformatf(" Printing trans, \n %s", trans.sprint()),UVM_LOW) end //} else begin //{ `uvm_info(get_type_name(),$sformatf(" Not recived transaction from get method"),UVM_LOW) end //} `uvm_info(get_type_name(),$sformatf(" After calling port get method"),UVM_LOW)end //}else begin //{ `uvm_info(get_type_name(),$sformatf(" component_a is not ready to send the transaction"),UVM_LOW)end //} |
2. Implement the can_get() method in comp_a
virtual function bit can_get(); `uvm_info(get_type_name(),$sformatf(" component_b requested for status"),UVM_LOW) return 0;endfunction |
Simulator Output With can_get() return value 1.
UVM_INFO @ 0: reporter [RNTST] Running test basic_test... ------------------------------------------------------ Name Type Size Value ------------------------------------------------------ uvm_test_top basic_test - @335 env environment - @348 comp_a component_a - @357 trans_out uvm_nonblocking_get_imp - @366 comp_b component_b - @376 trans_in uvm_nonblocking_get_port - @385 ------------------------------------------------------ UVM_INFO component_b.sv(26) @ 0: uvm_test_top.env.comp_b [component_b] Checking component_a status to get the transaction UVM_INFO component_a.sv(40) @ 0: uvm_test_top.env.comp_a [component_a] component_b requested for status UVM_INFO component_b.sv(29) @ 0: uvm_test_top.env.comp_b [component_b] component_a can send the transaction UVM_INFO component_b.sv(30) @ 0: uvm_test_top.env.comp_b [component_b] Requesting transaction. UVM_INFO component_b.sv(31) @ 0: uvm_test_top.env.comp_b [component_b] Before calling port get method UVM_INFO component_a.sv(24) @ 0: uvm_test_top.env.comp_a [component_a] Recived transaction imp port get request UVM_INFO component_a.sv(28) @ 0: uvm_test_top.env.comp_a [component_a] tranaction randomized UVM_INFO component_a.sv(29) @ 0: uvm_test_top.env.comp_a [component_a] Printing trans, --------------------------------- Name Type Size Value --------------------------------- trans transaction - @418 addr integral 4 'h3 wr_rd integral 1 'h1 wdata integral 8 'h6 --------------------------------- UVM_INFO component_a.sv(31) @ 0: uvm_test_top.env.comp_a [component_a] Sendting trans packet UVM_INFO component_b.sv(34) @ 0: uvm_test_top.env.comp_b [component_b] recived transaction from get method UVM_INFO component_b.sv(35) @ 0: uvm_test_top.env.comp_b [component_b] Printing trans, --------------------------------- Name Type Size Value --------------------------------- trans transaction - @418 addr integral 4 'h3 wr_rd integral 1 'h1 wdata integral 8 'h6 --------------------------------- UVM_INFO component_b.sv(41) @ 0: uvm_test_top.env.comp_b [component_b] After calling port get method UVM_INFO /apps/vcsmx/etc/uvm-1.2/src/base/uvm_objection.svh(1270) @ 0: reporter [TEST_DONE] UVM_INFO /apps/vcsmx/etc/uvm-1.2/src/base/uvm_report_server.svh(847) @ 0: reporter [UVM/REPORT/SERVER]
Simulator Output With can_get() return value 0.
UVM_INFO @ 0: reporter [RNTST] Running test basic_test... ------------------------------------------------------ Name Type Size Value ------------------------------------------------------ uvm_test_top basic_test - @335 env environment - @348 comp_a component_a - @357 trans_out uvm_nonblocking_get_imp - @366 comp_b component_b - @376 trans_in uvm_nonblocking_get_port - @385 ------------------------------------------------------ UVM_INFO component_b.sv(26) @ 0: uvm_test_top.env.comp_b [component_b] Checking component_a status to get the transaction UVM_INFO component_a.sv(40) @ 0: uvm_test_top.env.comp_a [component_a] component_b requested for status UVM_INFO component_b.sv(45) @ 0: uvm_test_top.env.comp_b [component_b] component_a is not ready to send the transaction UVM_INFO /apps/vcsmx/etc/uvm-1.2/src/base/uvm_objection.svh(1270) @ 0: reporter [TEST_DONE] UVM_INFO /apps/vcsmx/etc/uvm-1.2/src/base/uvm_report_server.svh(847) @ 0: reporter [UVM/REPORT/SERVER]
Output Analysist
In the second output with the return value set to ‘0’, we can see that as the return value is ‘0’ from comp_a, uvm_infos before and after the try_get method of comp_b and uvm_infos inside try_get method of comp_a are not getting executed.
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