https://errbits.com Technical deep dives on SystemC, C/C++, ARM architecture, and embedded systems. en-us https://errbits.com/assets/images/favicon.svg https://errbits.com https://errbits.com/articles/sc-port-and-sc-export-in-systemc.html https://errbits.com/articles/sc-port-and-sc-export-in-systemc.html sc_port requires a service from outside; sc_export provides one. Master both, understand hierarchical binding, elaboration binding rules, and how the same channel can be accessed through different interface views. Mon, 05 May 2026 00:00:00 +0000 SystemC https://errbits.com/articles/what-is-system-level-modeling.html https://errbits.com/articles/what-is-system-level-modeling.html System-level modeling means describing hardware behavior at a high abstraction — no clock cycles, no wires, just functionality. Here's what that means in practice and why SystemC is designed for it. Wed, 30 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-prim-channel-in-systemc.html https://errbits.com/articles/sc-prim-channel-in-systemc.html sc_prim_channel gives you request_update() and update() to participate in SystemC's evaluate-update protocol. Learn how to build a correct, deadlock-free custom channel from scratch — including a typed priority buffer. Mon, 28 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-interface-in-systemc.html https://errbits.com/articles/sc-interface-in-systemc.html sc_interface is the abstract root of every SystemC channel. Learn the IMC pattern, define custom interfaces, understand register_port and default_event, and see why TLM 2.0 is built on this foundation. Sun, 20 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/systemc-scheduler-internals.html https://errbits.com/articles/systemc-scheduler-internals.html A ground-up look at how the SystemC scheduler works: process states, the runnable queue, cooperative multitasking, initialization phase, execution order guarantees, SC_THREAD vs SC_METHOD in the scheduler, delta-triggered vs time-triggered wakeups, and starvation. Sat, 18 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-mutex-and-sc-semaphore-in-systemc.html https://errbits.com/articles/sc-mutex-and-sc-semaphore-in-systemc.html How SC_THREADs coordinate access to shared resources in SystemC. Covers sc_mutex (lock/unlock/trylock), sc_semaphore (wait/post/trywait), a complete shared-bus example, comparison table, and deadlock pitfalls. Thu, 16 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/port-binding-in-systemc.html https://errbits.com/articles/port-binding-in-systemc.html How SystemC ports connect modules to channels. Covers sc_in, sc_out, sc_inout declaration, direct binding in sc_main, hierarchical port forwarding, the four binding rules, port events, and common binding errors. Tue, 15 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-fifo-in-systemc.html https://errbits.com/articles/sc-fifo-in-systemc.html sc_fifo is SystemC's built-in blocking FIFO channel. Master write(), read(), nb_write(), nb_read(), depth, events, and the sc_fifo_in/sc_fifo_out port interface with a complete producer-consumer example. Tue, 15 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-clock-in-systemc.html https://errbits.com/articles/sc-clock-in-systemc.html Complete guide to sc_clock: period, duty cycle, start time, posedge/negedge events, connecting clocks to ports, multiple clocks, and clock gating patterns. Sun, 12 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-main-in-systemc.html https://errbits.com/articles/sc-main-in-systemc.html Deep dive into sc_main: elaboration, sc_start(), sc_stop(), time control, VCD tracing, error handling with sc_report_handler, and post-simulation analysis. Sun, 12 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/installing-systemc-on-windows-linux-mac.html https://errbits.com/articles/installing-systemc-on-windows-linux-mac.html Step-by-step guide to installing SystemC 2.3.3 on Windows, Linux, and macOS — from downloading the source to building, linking, and running your first simulation. Thu, 09 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-module-in-systemc.html https://errbits.com/articles/sc-module-in-systemc.html Complete guide to SC_MODULE: macro expansion, SC_CTOR vs SC_HAS_PROCESS, sc_in/sc_out ports, SC_METHOD vs SC_THREAD, sensitivity lists, module hierarchy. Thu, 09 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-signal-and-evaluate-update.html https://errbits.com/articles/sc-signal-and-evaluate-update.html sc_signal is not a variable — it's a channel with deferred writes. Master the evaluate-update mechanism, the read lag, value_changed_event, posedge/negedge, and the single-writer rule. Thu, 09 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/simulation-phases-in-systemc.html https://errbits.com/articles/simulation-phases-in-systemc.html Every SystemC simulation phase: elaboration, initialization, the evaluate-update execution loop, and end-of-simulation cleanup — plus the four lifecycle callbacks. Thu, 09 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/systemc-data-types.html https://errbits.com/articles/systemc-data-types.html Complete guide to SystemC data types: sc_int, sc_uint, sc_bv, sc_logic, sc_lv, sc_bigint, and sc_fixed — with bit operations, range/slice syntax, and performance ranking. Thu, 09 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/delta-cycles-in-systemc.html https://errbits.com/articles/delta-cycles-in-systemc.html Delta cycles are the invisible heartbeat of every SystemC simulation. Understand how the evaluate-update loop works, why signals don't update immediately, and what SC_ZERO_TIME actually does. Wed, 08 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/events-and-sensitivity-in-systemc.html https://errbits.com/articles/events-and-sensitivity-in-systemc.html sc_event, static sensitivity, and dynamic sensitivity explained. How SystemC processes decide when to wake up — and why missing an event can deadlock your simulation. Mon, 06 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/sc-thread-vs-sc-method.html https://errbits.com/articles/sc-thread-vs-sc-method.html SC_THREAD and SC_METHOD model fundamentally different simulation behaviors. Here's what actually sets them apart, with code. Mon, 06 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/evolution-of-channels-in-systemc.html https://errbits.com/articles/evolution-of-channels-in-systemc.html From sc_signal wires to TLM sockets — how SystemC channels evolved across abstraction levels, and why the channel-interface-port triad is the backbone of all SystemC communication. Thu, 02 Apr 2026 00:00:00 +0000 SystemC https://errbits.com/articles/introduction-to-arm-architecture-and-its-impact.html https://errbits.com/articles/introduction-to-arm-architecture-and-its-impact.html ARM architecture overview: RISC design principles, Cortex-A, Cortex-R, and Cortex-M profiles — plus how ARM's instruction set evolved from ARMv7 to ARMv8 (AArch64). Sun, 13 Oct 2024 00:00:00 +0000 ARM https://errbits.com/articles/vptr_vtble.html https://errbits.com/articles/vptr_vtble.html Under ideal compiler optimizations, devirtualization can reduce vptr loads to zero. Covers vtable layout, vptr load counting, final keyword, CRTP, and PGO. Mon, 20 May 2024 00:00:00 +0000 C++ https://errbits.com/articles/how-to-create-a-thread-and-execute-it-on-specific-cpu-core.html https://errbits.com/articles/how-to-create-a-thread-and-execute-it-on-specific-cpu-core.html Create POSIX threads in C/C++, set scheduling policies, configure thread priority, and pin execution to a specific CPU core using pthread and CPU affinity APIs. Sun, 27 Feb 2022 00:00:00 +0000 Systems https://errbits.com/articles/real-time-logging-for-embedded-systems-and-iot.html https://errbits.com/articles/real-time-logging-for-embedded-systems-and-iot.html Remote embedded logging in Linux-based IoT systems: syslog levels, facility codes, sending logs over UDP/MQTT to a remote server, and C code examples for datalogging pipelines. Sat, 05 Feb 2022 00:00:00 +0000 Embedded https://errbits.com/articles/difference-between-structure-and-union.html https://errbits.com/articles/difference-between-structure-and-union.html struct vs union in C: a union shares one memory block for all members; a struct gives each member its own. Memory layout, sizeof comparison, and when to choose each. Sun, 16 Jan 2022 00:00:00 +0000 C https://errbits.com/articles/constant-pointer.html https://errbits.com/articles/constant-pointer.html const pointer vs pointer to const in C: int *const p fixes the address; const int *p fixes the value. See all four combinations, syntax rules, and embedded use cases. Sun, 02 Jan 2022 00:00:00 +0000 C https://errbits.com/articles/volatile-in-c-and-compiler-optimization.html https://errbits.com/articles/volatile-in-c-and-compiler-optimization.html What volatile does in C, how it prevents compiler optimization of variables accessed by hardware or multiple threads, with ARM assembly examples. Tue, 28 Dec 2021 00:00:00 +0000 C https://errbits.com/articles/storage-classes-in-c.html https://errbits.com/articles/storage-classes-in-c.html Complete guide to all four C storage classes: auto, register, static, and extern. Scope, lifetime, memory layout, and embedded-systems use cases. Thu, 16 Dec 2021 00:00:00 +0000 C https://errbits.com/articles/double-pointer-in-c.html https://errbits.com/articles/double-pointer-in-c.html Master double pointers (int **) in C: memory layout, modifying a pointer from inside a function, dynamic 2D arrays, linked list manipulation, and common pitfalls. Thu, 09 Dec 2021 00:00:00 +0000 C https://errbits.com/articles/pointer-in-c-c.html https://errbits.com/articles/pointer-in-c-c.html Complete guide to pointers: declaration, arithmetic, void/null/dangling pointers, function pointers, const combinations, pointer vs reference — with code examples. Sat, 04 Dec 2021 00:00:00 +0000 C