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Research

MIC Real-Time OS

ezTCP

Key features of MIC micro-kernel

Single processor

Dynamic priority, Round Robine scheduling

Semaphore priority inheritance / priority inversion

63 priorities / task profiling

Deterministic interrupt response time

Nested interrupt / preemtible kernel mode

Message box, message queue, semaphore

Timer pseudo device for device operation expansion of Timer

Various interrupt types : DIY / CS / PS / MIC

Kernel Size - i386

basic kernel : scheduler, timer, kernel_gate : 4K

memory/task/exception handler + IPC : 3K

device I/O + ethernet + TCP/UDP/IP : 27K

Developed Processor Modules

MC68EN360(m68k) 25MHz, 32bit SRAM 0 wait

interrupt latency : 22.4us(disable round-robin), 31.2us(enable round-robin)

semaphore priority inheritance overhead: 58.4us

MFA memory allocation time: 66.4us

task to task switching time: 62.4us

TCP xfer rate: 810Kbyte/s(6.6Mbps)(10Base-T, builtin NIC)

80386ex(i386) protected mode, 33MHz, 16bit SRAM 1 wait

interrupt latency : 29.6us(disable round-robin), 39.2us(enable round-robin)

semaphore priority inheritance overhead: 65.2us

MFA memory allocation time: 54.8us

task to task switching time: 70.0us

TCP xfer rate: 970Kbyte/s(7.9Mbps)(10Base-T, RTL8019AS)

Am188es 40Mhz, 8bit ROM 1 wait, 8bit SRAM 1 wait

interrupt latency : 204us

task to task switching time: 278us

TCP xfer rate: 250Kbyte/s(2Mbps)(10Base-T, RTL8019AS)

KS32C50100(ARM7 core) 50Mhz, 32bit SDRAM, 8K cache

interrupt latency(best cache hit) : 5.5us(disable round-robine), 8.1us(enable round-robine)

MFA memory allocation time: 10.3us

task to task switching time: 9.3us

TCP xfer rate: 4.4Mbyte/s(37Mbps)(100Base-T, builtin NIC)