How to Address Device behind PCI Bridge

Hi!all~ ~
I have a question about "how" to address device behind PCI Bridge.
The point is that i use AHB-PCI bridge in PCI add-in card-
and i don't know how to transmit data to else device.
(ex,Main Memory,other device..etc)
First,I know PCI can transmit data to device in Type1,but i am weak in
that how can i do to know/get device to porcess data transfer behind
PCI bridge?
I'm confused several day.

Regards.

 

any body know?
my question is that i want to know embedded system how to transfer
data to mb device through PCI bus.