Praktikum: SystemC. SystemC-Labs. Joachim Falk Friedrich-Alexander-Universität Erlangen-Nürnberg Joachim Falk

Transcription

1 Praktikum: SystemC SystemC-Labs 1

2 Agenda Running the SystemC Simulation Phases of the SystemC Simulation Power On Reset Add AlarmClock Module to Top Implement BCD to Seven Segment Display the Time of the Alarm Clock Implement the Alarm 2

3 Running the SystemC Simulation Open the Eclipse workspace workspace02 /workspace02 3

4 Running the SystemC Simulation Open the project 02_sysc_lab_alarmclock 02_sysc_ex01-startup 02_sysc_ex02-event 02_sysc_ex03-SC_METHOD 02_sysc_ex04-SC_THREAD 02_sysc_ex05-SC_CTHREAD 02_sysc_ex06-HWSIGNAL 02_sysc_ex07-FIFO 02_sysc_ex08-FIXPOINT 02_sysc_lab_alarmclock Hint: The projects 02_sysc_ex01 02_sysc_ex08 contain example code for various stuff. You might want to use it as a reference. 4

5 Running the SystemC Simulation Compile and Run the program using the eclipse Build menu Run menu 5

6 Phases of the SystemC Simulation Task 1 (Top.hpp/cpp): Phases of the SystemC Simulation Edit the SystemC Module Top in Top.hpp/cpp - Define the SystemC Module - Add a constructor for Top Register driveresetlow as a method process Evaluate SystemC phase callbacks - Overwrite start_of_simulation - Overwrite end_of_simulation - Overwrite before_end_of_elaboration - Overwrite end_of_elaboration Output: top: s called! sc_core::sc_start s top: s called! top: s called! top: s called! top: s called! sc_core::sc_stop ms sc_core::sc_stop ms SystemC: simulation stopped by user. top: ms called! sc_core::sc_start ms 6

7 Power On Reset Task 2 (Top.hpp/cpp): Power On Reset Define the resetonpoweron signal - Should be initialized to one in the constructor - Should be driven to zero by the driveresetlow method at 1 ms Define the driveresetlowevent event - Should be used to activate the driveresetlow method - Should be notified at 1 ms Adjust the sensitivity of driveresetlow - Make sure that driveresetlow is not activated at start of simulation Output: top: s called! sc_core::sc_start s top: s called! top: s called! top: s called! top: ms called! sc_core::sc_stop ms sc_core::sc_stop ms SystemC: simulation stopped by user. top: ms called! sc_core::sc_start ms 7

8 Add AlarmClock Module to Top Task 3 (Top.hpp/cpp): Add AlarmClock Module to Top Instantiate the AlarmClock module as alarmclock Add required SystemC signals to connect the alarmclock module to the fakeio module. Add a clock generator for a 9 khz clock to be used by the alarmclock module Connect the input and output ports of the alarmclock module to the fakeio module. Also handle the previously implemented power on reset! Reset switch 8

9 Implement BCD to Seven Segment Task 4 (AlarmClock.hpp/cpp): Implement BCD to SSD The Seven Segment Display (SSD) is controlled by - The signal ssdigitsel, which determines which of the 4 SSDs are driven - The signal ssdigit, which drives the 7 segments of the SSD Implement the reset in the displaydigit method Register the method display as a clock thread with SystemC Adjust the sensitivity of the displaydigit method Implement the BCD to SSD conversion in displaydigit - The digit to display is given by the digit signal (Driven by display thread) - The SSD to display the digit on is given by the digitactive signal Segment 6 of the SSD 6 SSD SSD0 9

10 Display the Time of the Alarm Clock Task 5 (AlarmClock.hpp/cpp): Alarm Clock Time Display Select the time to display, either msecstime or msecsalarm, depending on the displayalarm signal. Times are stored as msecs counter from midnight. Derive <7H><6H>:<5M><4M>:<3S><2S>:<1MS><0MS> the above eight digits for display from the msecs counter Display derived from msecstime or msecsalarm Decrease digitstart Increase digitstart 8 digits are multiplexed onto 4 SSDs starting with digitstart. 10

11 Implement the Alarm Task 6 (AlarmClock.hpp/cpp): Alarm Implementation Register the method ringalarm as a SC_METHOD process (Trigger the process on each rising edge of the clock signal) Implement a sensible reset behavior for ringalarm Implement the alarm functionality. - The alarm should be triggered when msecsalarm is equal to msecstimeset and the corresponding alarm switch of the alarm clock is enabled. - The alarm should be turned off by disabling the alarm switch. - To signal alarm, the ringled and ringactive outputs must be set to one and the ringtoggle must be toggled with a rate of 4.5 khz. ringled Alarm switch 11