Cobham Gaisler AB provides IP cores and supporting development tools for embedded processors based on the SPARC architecture. We specialize in digital hardware design for both commercial and aerospace applications

TSIM3 GR716 simulator

TSIM3 GR716 beta release simulates the GR716 LEON3FT microcontroller that has been developed by Cobham Gaisler. GR716 simulation is possible using a TSIM3-LEON3 license or the dedicated TSIM3-GR716 license at the reduced price.

TSIM3 is currently being developed introducing new functionality such as multi-core models for GR740/GR712RC, Tcl frontend for better automation, new IO models and improved APIs, GDB-8 support, and so on while still maintaining functionality and the accuracy profile of TSIM2 allowing efficient SW V&V development. The TSIM3-GR716 beta release includes a selection of the functionality that is important to support an efficient S/W development with GR716. As this is a beta release, not everything that TSIM3 will support for GR716 is in place. Additional devices and some missing features of simulated devices will be added in the future. Please check this page again for future updates.

TSIM is an instruction-level simulator capable of emulating LEON-based computer systems. TSIM provides several unique features:

  • Emulation of LEON3 processor in general and tailored emulation of GR716
  • FPU emulation
  • Faster than realtime GR716 emulation
  • Standalone operation with scriptable Tcl command line
  • Operation via remote connection from GNU Debugger (GDB)
  • Provided as a library to be included in larger simulator frameworks (not supported in this GR716 beta release)
  • 64-bit time for practically unlimited simulation periods
  • Detailed instruction traces and AMBA bus traces
  • Memory emulation, including SRAM, PROM, SPI memories and the CPU's local RAM.
  • Loadable modules to include user-defined device models
  • Non-intrusive execution time profiling
  • Non-intrusive code coverage monitoring
  • Stack backtrace with symbolic information
  • Check-pointing capability to save and restore complete simulator state (not supported in this GR716 beta release)
  • Unlimited number of breakpoints and watchpoints

Two host platforms are supported: Linux and Windows 7 and 10.

  • TSIM3 GR716 User's Manual (for password contact This email address is being protected from spambots. You need JavaScript enabled to view it.)

Usage

TSIM can be run in stand-alone mode, or connected through a network socket to the GNU Debugger (GDB). In stand-alone mode, a variety of debugging commands are available to allow manipulation of memory contents and registers, breakpoint/watchpoint insertion, performance measurements, instruction traces and bus traces. Connected to (supported versions of) GDB, TSIM acts as a remote target and supports GDB debug requests. The communication between GDB and TSIM is performed using the GDB extended-remote protocol. Third-party debuggers supporting this protocol can be used.

The screenshot shows Eclipse connected to TSIM via GDB (click on image for a larger view).

Timing

The simulator time is maintained and incremented according the IU and FPU instruction timing. The parallel execution between the IU and FPU is modelled, as well as stalls due to operand dependencies. Instruction timing has been modelled after the real devices. Integer instructions have a higher accuracy than floating-point instructions due to the somewhat unpredictable operand-dependent timing of the FPU. Typical usage patterns have higher accuracy than atypical ones. The simulator time is maintained using 64-bit values providing virtually unlimited simulation time.

GR716 emulation

The functionality of the GR716 LEON3 VHDL model is emulated, including on-chip peripherals and I/O cores such as:

  • SpaceWire, CAN, GPIO, FTMCTRL, Boot ROM, SPI, SPIM, GPTIMER, UART, DAC etc.

Additional GR716 features include:

  • Ability to boot from SPIM, SRAM and PROM
  • Atomic access support for all APB registers and local data RAM (AND, OR, XOR, Set&Clear).

AHB and I/O emulation

TSIM has the capability to be extended with user-defined modules. This can be used to add simulation models of AHB and I/O devices as well as models connected to interfaces simulated by TSIM, such as GPIO, SPI and CAN. Such modules are loaded by TSIM at run-time. The modules has access to the simulator event queue, interrupts and other internal data structures, allowing for accurate emulation.  Modules are typically written in C, and can use any features of the host operating system. This provides high simulation performance and capability to communicate with any other framework (e.g. such as EUROSIM or SIMSAT).

Profiling

The TSIM profiling function calculates the amount of execution time spent in and under each subroutine of the simulated program. The profiling is non-intrusive. The Profiling does not have any affect on the execution in terms of simulated time and no changes needs to be done to the instrumented code. The profiling information is printed as a list sorted on highest execution time ratio:

tsim> load dhrystone.elf

...
tsim> profile 1
  profiling enabled, sample period 1000
tsim> run
...
tsim> profile
  function      ratio(%)
  __bcc_crt0      100.00
  main             99.35
  Func_2           31.04
  strcmp           26.97
  memcpy           17.34
  Proc_8            7.70
  Func_1            5.13
  Proc_7            4.49
  Proc_6            1.92
tsim>

Code coverage monitoring

The TSIM code coverage support will monitor all internally emulated processor memory. The coverage support also monitors the  AHBROM and SPIM cores. When coverage is enabled, TSIM registers whether a memory location has been read, written or executed. The coverage information can be displayed on the TSIM console or dumped to a file for batch post processing. When coverage is enabled, the simulation performance is decreased compared running TSIM with coverage disabled.

tsim> cov en
  coverage enabled:
  0x01000000 - 0x01200000  : ROM
  0x40000000 - 0x40400000  : SRAM
  0x00000000 - 0x00100000  : AHBROM
  0x30000000 - 0x30010000  : DLRAM
  0x31000000 - 0x31020000  : ILRAM
  0x02000000 - 0x04000000  : SPIM0
  0x04000000 - 0x06000000  : SPIM1
tsim> cov print strcmp
  31004198 : 1  1 11  0  1  1  1 11  0  1  1  1  1  1  1  1
  310041d8 : 9  1  0  0  1  1  1 11  0  1  1  1  1 19  1  1
  31004218 : 1 11  1  1  1  9  1  0  0  1  1 19  1  1  1  1
  31004258 : 1  9  1  0  0  0  0  1  1  1  0  0  1  9  1  0
  31004298 : 0  0  0  0  0  0  0  0  0  0  0  0  1  1  1  1
  310042d8 : 1  1  1  1  9  1  0  0  0  0  0  0  0  0  0  0
  31004318 : 0  0  0  0  1  1 19  1  1  1  0  0  0  0  0  0
  31004358 : 0  0  0  0  0  0  0  0  0  0  4  0  0  0  0  0
  31004398 : 0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0
  310043d8 : 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
  31004418 : 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
  31004458 : 4  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0
  31004498 : 0  0  0  0  0  0  0  1  1  1  1  1  1  1  1  1
  310044d8 : 1 11  1  1  1 11  1  1  1  1 11  0  1  1  1 11
  31004518 : 1  1  1 11  0  1  1  1 19  1  1  1  1  1  1  1
  31004558 : 11  1  1  1 19  1  1 11 0  1  1  1  1  1  1  1

Performance

A collection of performance statistics are automatically calculated and can be displayed with the 'perf' command:

tsim> perf
  Performance statistics for CPU 0

   Cycles : 467054246
   Instructions : 334033114
   Overall CPI : 1.40

   CPU performance (50.0 MHz)  :  35.76 MOPS (35.76 MIPS, 0.00 MFLOPS)
   Simulated time              :   9.34 s
   Processor utilisation       : 100.00 %
   Real-time performance       : 123.93 %
   Simulator performance       :  44.32 MIPS
   Used time (sys + user)      :   7.54 s

Host support

TSIM is available for Linux and Windows 7 and 10.

Users and projects

More than 500 commercial TSIM licenses have been sold and are being used in various LEON and ERC32 projects. Many more copies of the evaluation version of TSIM are used by individuals and universities. TSIM is the market leader for LEON and ERC32 simulation, and used in major space projects such as Cryosat, ATV, Beagle-2, Ariane-5, GOCE, Herschel/Planck, PROBA-2 and many others.

Download

To download TSIM or the user's manual, please proceed to the download page.