How to find the base address of a pci device in register programming?

Hello Everyone
I am making a register program to pci-7344.
At this link http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/15f094f65a17e3af8625660d0018a20a?O... I find a method that finds the correct address in the register programming a pci device,but I am confused with some details.
It says BAR0 is assigned to the miniMITE ASIC,while BAR1 is used to program the PCI device itself.So the address mapped from BAR0 is
supposed to be the base-address of the registers on the miniMITE,but why 0x300 is added to the base-address? What 0x300 means?
I wonder if the address mapped from the BAR1 is not the valid baseadress for the pci board and a initial offset should be added to
it.If so what is the initial offset?
Thank you!!

Thank you for your reply !!
I am developing pci-7344`s driver under venturecom`s rtx,now I have found the baseadresses[0] and baseadresses[1] . baseaddresses[0] is the base-address of the miniMITE and I can get the vendor ID, device ID by directly reading from baseaddresses[0] +offset,but baseaddresses[1] does not like to be the base address of the 7344 registers,because I can not get the correct status information when I read from the csr(baseaddresses[1]+0x04)(all the value read back is 1).According to your advice I add the following codes to the program.
window_data_value = ( (0xffffff00 & (ULONG)BAR1.LowPart) | (0x00000080) );
*((PLONG)(vMemAddr[0]+0xc0)) = window_data_value;
vMemAddr[0] is the virtual address that is mapped from BAR0 into the user`s program ,which gives us access to physical memory locations on the system.
After adding these codes I still can read the correct information from BAR0,but I still can not read back the correct value from BAR1(all the value read back is 0).
It says in ddk that the csr(a read-only register) is located at cardlogicaddress+4(8byte offset),so I wonder what the cardlogicaddress is . What is relationship between baseaddresses[1] and cardlogicaddress?
Thank you!!!!!

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