Extending POLIS with User Defined Data Types Arvind Thirunarayanan

1. EECS 249 Dec 4, 1999 Extending POLIS with User Defined Data Types Arvind Thirunarayanan

2. Overview • What is POLIS? • Design Flow • Project Description • Proposed Solution • Current/Future Work

3. What is POLIS? • System Design • initially HW/SW • function architecture co-design • Co-design environment • mixed system • specification, synthesis, estimation, verification • Embedded system

4. Design Flow - Simulation Path • Initial specification of embedded system • high level language - Esterel • compile into SHIFT • Read into POLIS • create/ optimize internal graph representation • generate C/Ptolemy code for each module • Functional/Performance simulation • validation to analyze performance • repartition to evaluate implementation

5. Design Flow - Synthesis Path • Read into POLIS • partition each module into hardware/software • Hardware • Translate into a hardware format like VHDL,BLIF • Optimize and write netlist • Software • create/ optimize internal graph representation • generate RTOS and C code for each module • Generate hardware and software implementation

6. Project Description • Motivation • Two Chip Intercom (TCI) Project at BWRC • Current POLIS • no support for user-defined data types • use of events • data of integer types only • workaround for floats • Project implementation • change SHIFT to include user-defined types • extend the changes through the synthesis paths

7. Esterel Auxiliary file SHIFT HW SW Proposed Solution • Aux file • type definitions • structs, arrays • SHIFT file • not just a bit • add type information • Synthesis path • translate to synthesized types • VHDL records

8. Proposed Solution • Aux file • type definitions • structs, arrays • SHIFT file • not just a bit • add type information • Synthesis path • translate to synthesized types • VHDL records File.aux typedef struct { int re; int im; } cplx; typedef array arr_name int 20;

9. Proposed Solution • Aux file • type definitions • structs, arrays • SHIFT file • not just a bit • add type information • Synthesis path • translate to synthesized types • VHDL records File.shift .net net_sender .inputs *i1 .outputs *o1(o1) .nb o1 0 … .end

10. Proposed Solution • Aux file • type definitions • structs, arrays • SHIFT file • not just a bit • add type information • Synthesis path • translate to synthesized types • VHDL records File.shift .net net_sender .type int 16 .type struct cplx re im .dt re int .dt im int .inputs *i1 .outputs *o1(o1) .dt o1 cplx … .end

11. Current/Future Work • Current changes in tool • implementation in SHIFT • code for automatic generation • SHIFT from user input • manual definition of translation • synthesis from SHIFT • Future work • generate type declaration for synthesis • currently done by hand • functions to access the data types