eCos (embedded Configurable operating system)是一組合式的微型即時作業系統，適用於小記憶容量的嵌入式系統。其特點為

1. open-source

2. royalty-free

3. highly configurable

4. real-time

eCos測試環境：

1. Xilinx ML403 Virtex-4 FX12

2. Xilinx EmacLite, Tx/Rx interrupts are enabled

3. OS: eCos on 200MHz Power PC

4. Send and Receive packets

5. Packet Size: 100 bytes

測試結果：
測試週期1.3ms 時，最大延遲 < 2.5us

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