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Altera_Forum
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13 years ago

Ethernet roundtrip time with NicheStack & Nios-II

Hi, We are using TSE IP with NichStack, MicroC OS-II on Nios-II. FPGA is running a simple UDP host which echoes all packets it gets from client. The client is a PC running real-time OS and con...
Altera_Forum's avatar
Altera_Forum
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13 years ago

A simple custom instruction (add the two 16bit halves of 'a' onto 'b') will significantly improve the checksum time (because the nios has no carry flag so can't do 32bit 'add with carry usually used for sw checksum).

You probably also want one for byteswap (16bit and 32bit).