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Altera_Forum
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21 years ago

PIO address space

Hello! May be somebody knows, why SOPC Builder determins 0x0F address space for every PIO? Why does PIO need such size of address space? Tnank you.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Hi Kira,

The PIO is always generated with two address bits. For I/O,

the registers are 32-bit aligned. So you get 4 regs x 4 bytes

or 0x10 of address space -- even when some of the registers

are not implemented (e.g. write-only PIO).

Regards,

--Scott