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Extensions for User-Specified Types
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In order to support user-specified composite types, the user needs to provide a partial template specialization of scv_extensions for the specific composite type in the test bench. |
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Similar to the existing SystemC SC_MODULE macro, the SCV_EXTENSIONS and SCV_ENUM_EXTENSIONS macros create appropriate classes for the user-specified composite type and userspecified enumeration type. |
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The related macros in the SystemC Verification Standard to facilitate this process are summarized in the following table: |
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The scv_extensions Macros
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Description
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SCV_EXTENSIONS (type_name)
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This macro is similar to SC_MODULE(). It defines the extension class for the composite type identified by type_name.
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SCV_EXTENSIONS_CTOR (type_name)
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This macro is similar to SC_CTOR(). It defines the constructor for the extension class of the composite type identified by type_name.
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SCV_EXTENSIONS_ BASE_CLASS (base_type_name)
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This macro declares base_type_name as the base class of the class to be extended. It must be instantiated within the block after SCV_EXTENSIONS_CTOR.
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SCV_FIELD (field_name)
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This macro declares a field identified by field_name. SCV_ENUM_EXTENSIONS(type_name) This macro is similar to SC_MODULE(). It defines the extension class for an enumeration identified by type_name.
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SCV_ENUM_CTOR (type_name)
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This macro is similar to SC_CTOR(). It defines the constructor for the extension class of the enumeration identified by type_name.
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SCV_ENUM (enum_element_name)
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This macro declares an enumeration element identified by enum_element_name.
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Example : scv_user_defined
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1 #include <scv.h>
2
3 struct packet_t {
4 sc_uint<8> addr;
5 sc_uint<12> data;
6 };
7
8 SCV_EXTENSIONS(packet_t) {
9 public:
10 scv_extensions< sc_uint<8> > addr;
11 scv_extensions< sc_uint<12> > data;
12 SCV_EXTENSIONS_CTOR(packet_t) {
13 SCV_FIELD(addr);
14 SCV_FIELD(data);
15 }
16 };
17
18 int sc_main (int argc, char* argv[]) {
19 packet_t pkt;
20 pkt.addr = rand();
21 pkt.data = rand();
22 int bitwidth = scv_get_extensions(pkt.addr).get_bitwidth();
23 cout << "Width of addr is "<< bitwidth << endl;
24 bitwidth = scv_get_extensions(pkt.data).get_bitwidth();
25 cout << "Width of data is "<< bitwidth << endl;
26 scv_get_extensions(pkt).print();
27 return 0;
28 }
You could download file scv_user_defined.cpp here
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Simulation Output : scv_user_defined
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Width of addr is 8
Width of data is 12
{
addr:103
data:966
}
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Copyright © 1998-2025 |
Deepak Kumar Tala - All rights reserved |
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Do you have any Comment? mail me at:deepak@asic-world.com
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