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Can you explain why SH-4 doesn't support items in PCI V2.1 standard?

Latest Updated:03/23/2009

Question:

I understand that SH-4 does not support some items in PCI V2.1 standard. I would like to know more details.

Answer:

(1) In PCI V2.1 standard, I/O space of PCI device is less than 256byte. But SH7751 requires 1Mbyte.

(2) PCI V2.1 standard supports any combinations of value of BE<3:0> when receiving configuration access. But in the SH7751, value of BE<3:0> is ignored and only longword access is supported.

(SH7751R conforms to PCI V2.1 standard.)

Suitable Products
SH7751