TCP201 User Manual Issue 1.4
Page 10 of 35
3.1.2 PCI Base Address Initialization
PCI host bus-initialization software determines the required address space by an
initialization write
access
(writing a value of all ones ‘1’ to a PCI Base Address Register) and then reading back the
value of the PCI Base Address Register. The PCI9030 (PCI Target chip) returns zero ‘0’ in don’t care
address bits, specifying the required address space. The PCI software then maps the local address
space into the PCI address space by programming the PCI Base Address Register.
After programming the required address spaces the user must set bit 0 (enables I/O accesses) and bit
1 (enables memory accesses) of the Command Register (Offset 0x04) to ‘1’.
