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Altera_Forum
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9 years ago

Problem in Generation of write_n, read_n signals in NIOS-II

Dear all, I am facing a peculiar problem while using NIOS. I have written my own custom core, which is having Control register,Status register, Select_reg, TX_register, RX_register and I am trying...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

If your component is correctly receiving read_n or write_n strobes for one address, but is not receiving it for other addresses, it sounds like you have an error in how you have specified the address range for your component.

You can quickly check this within Qsys looking at the address map, or you can read your BSP generated system.h and look for your component and it's "#define nnnnnnn_SPAN yyy" attribute.

Basically, Qsys generates the address decode logic and if your address span isn't wide enough it's not going to send you read_n/write_n.