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Altera_Forum
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21 years ago

IORD_XDIRECT AND IOWR_XDIRECT?

Hello: Now I have some problems about the I/O Marco IORD_XDIRECT AND IOWR_XDIRECT.For example: I have a 16 bits slave periphery and the BEn0 ,BEn1 are both always low(means that th...
Altera_Forum's avatar
Altera_Forum
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21 years ago

I look up "io.h" which define the "IORD/IOWR", and then "stb / stbio, lbu/lbuio....." in the Instruction Set Reference of NIOSII. I can't understand the specification about those instructions.

Can someone help us to explain what they work out detailly?