Description
According to PCI® 3.0 base spec, I/O space must not consume more than 256 bytes per I/O Base Address register and the upper 16 bits of I/O Base Address registers are hardwired to zero for devices intended for 16 bit I/O system. Since I/O space is usually used for controlling peripheral as single dword accesses, users do not typically need to allocate a large I/O memory map for this purpose.
Environment
BUILT IN - ARTICLE INTRO SECOND COMPONENT