Reconfigurable Computing S. Reda, Brown University Reconfigurable Computing (EN2911X, Fall07) Lecture 15: SystemC (3/3) Prof. Sherief Reda Division of Engineering, Brown University

Reconfigurable Computing S. Reda, Brown University Integer data types Supported native C++ synthesizable data types –long long (64 bits) –long (32 bits) –int (32 bits) –short (16 bits) –char (8 bits) –bool (1 bit) SystemC also allows further refined storage types –sc_bit –sc_bv –sc_int –sc_uint –sc_bigint –sc_biguint

Reconfigurable Computing S. Reda, Brown University Floating-point data types Full supported for compilation with VisualC++ and systemC library Supported for synthesis by Celoxica’s Agility compiler only if they can be evaluated during compilation time → Any calculation involving float point must evaluate to a constant sc_int SinTable [128]; for(int i=0; i < 128; i++ ) { double index=(double) i; double angle=2.0*PI*(index/128.0); double sineangle=sin(angle); SineTable[i]=sc_uint (sineangle* ); } Synthesizable example Not synthesizable example sc_in in; float x; X=in.read();

Reconfigurable Computing S. Reda, Brown University Arrays Full supported for compilation with VisualC++ and systemC library For synthesis with Agility compiler, an array is synthesizable if its elements are of a synthesizable type and its size is compile-time determinable int temp, array[100]; sc_in in; For(int y=0; y < 100; y++) { in.read(temp); array[y]=temp; wait(); } Synthesizable example #include float l[10]; for(int y=0; y<10; y++) l[y]=log10((y+1)*10); //… sc_out out; for(int y=0; y < 10; y++) out.write((int)l[y]); Although the array is not synthesizable, the members are only used during compilation time and are cat to type int

Reconfigurable Computing S. Reda, Brown University Pointers Full supported for compilation with VisualC++ and systemC library Agility supports pointers subject to the restriction that Agility can always determine the target of the pointer A pointer is synthesizable if it is a pointer to a synthesizable type, and the value to which the pointer points is compile-time determinable void clear(char *a, char *b) { *a=255; *b=255; } sc_out out; unsigned char x, y; clear(&x, &y); out.write(x); } Resolvable pointer

Reconfigurable Computing S. Reda, Brown University Other considerations for synthesis Full supported for compilation with VisualC++ and systemC library Operator new is supported at compiler time but not at runtime. delete operator is not supported Each action in a switch must have a break statement. Fall through is not allowed If a function to be synthesized, its body must only contain code that within Agility synthesizable subset General recursion is not supported for synthesis

Reconfigurable Computing S. Reda, Brown University Example using synthesis and compilation flow Rest of code (testbenches, SW code) Synthesizable subset Celoxica agility synthesizer Quartus II Verilog/edif Visual C++ SystemC library executable

Reconfigurable Computing S. Reda, Brown University Celoxica’s Agility compiler tutorial

Reconfigurable Computing S. Reda, Brown University Starting adding files to your project

Reconfigurable Computing S. Reda, Brown University Adjust the project settings to use the Cyclone II devices

Reconfigurable Computing S. Reda, Brown University Add your file and write your class declaration

Reconfigurable Computing S. Reda, Brown University Add the main synthesis entry point Not the most direct implementation

Reconfigurable Computing S. Reda, Brown University Build your project

Reconfigurable Computing S. Reda, Brown University Check the CDFG and Verilog output

Reconfigurable Computing S. Reda, Brown University Copy the Verilog file into Quartus II Sometimes the Celoxica compiler changes the name of input/output outputs when it exports to Verilog so make sure to fix this in Quartus II assignment editor Then build and download to the FPGA

Reconfigurable Computing S. Reda, Brown University What if we want to verify and simulate before downloading to the FPGA? Choose Visual C++ Add a tester.h for tester module testerorgate KEY[0] KEY[1] LEDG clk

Reconfigurable Computing S. Reda, Brown University Add the main body

Reconfigurable Computing S. Reda, Brown University Hit Build and then run the executable Build indirectly invokes the command line compiler of VC (cl) which links your compiled code with SystemC.lib

Reconfigurable Computing S. Reda, Brown University If you like to synthesis again, make sure to mark the files you want to synthesize Exclude tester.h and orgate_exe.cpp Choose Verilog as your desired output again

Reconfigurable Computing S. Reda, Brown University HW/Lab 3 Objective: Learn SystemC using both the synthesis and compilation flows. This time it is a simple example. We will design an 8-bit ALU. Use the 18 switches in the DE2 board to achieve your target: –8 switches give the binary of the first unsigned integer –8 switches give the binary of the second unsigned integer –2 switches give the ALU operation (addition, subtraction, multiplication and XORING) In your report, make sure to include the SystemC code, the executable output print of simulations, and the FPGA resource utilization. You have to send me by your projects archived for both the SystemC design and the Quartus II files Lab due before Thanksgiving holiday (Thur 22 nd ) Tutorials and Celoxica manual uploaded at the class webpage and also available to download from Engineering website