Information

PCI Express Interface Controller

MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1

Freescale Semiconductor 14-107

PEX_OWTARLn and PEX_OWTARHn registers. This register should be used in 64-bit addressing.

Otherwise it should contain all zeroes.

Table 14-129 defines the bit fields of PEX_OWTARHn.

14.5.11 PCI Express EP Inbound Address Translation Registers

The following registers are used as the base address for the CSB domain to translate the address of an

inbound transaction from the PCI Express domain. They are valid only in End Point (EP) mode and operate

in conjunction with the base address registers in the PCI Express configuration space.

When a PCI Express inbound transaction hits a valid address window defined by the PCI Express

configuration space base address registers and the respective translation register is enabled, the incoming

address is translated to a CSB domain address and the transaction is forwarded to the CSB.

The correspondence between the PCI Express configuration space base address registers and the

respective translation address registers is shown in Table 14-130.

Offset 0xCAC, 0xCBC, 0xCCC, 0xCDC Access: Read/Write

31 0

TAH

Reset All zeros

Figure 14-131. PCI Express Outbound Window Translation Address Register High n

(PEX_OWTARH0–PEX_OWTARH3)

Table 14-129. PEX_OWTARHn Register Fields Description

Bits Name Description

31–0 TAH Translation address high. Higher portion of the PCI Express address base ([63–32]). The complete 64-bit

address on the PCI Express bus is built of {PEX_OWTARH[TAH],PEX_OWTARL[TAL], 0x000}.

Table 14-130. EP Inbound Base and Translation Address Registers Correspondence

Base Address

(Configuration Space)

BAR Name Type TAR Address TAR Name

0x010 BAR0 Window 0, 32-bit address 0xDE0 PEX_EPIWTAR0

0x014 BAR1 Window 1, 32-bit address 0xDE4 PEX_EPIWTAR1

0x018 BAR2 Window 2, 64-bit address, low portion 0xDE8 PEX_EPIWTAR2

0x01C BAR3 Window 2, 64-bit address, high portion

0x020 BAR4 Window 3, 64-bit address, low portion 0xDEC PEX_EPIWTAR3

0x024 BAR5 Window 3, 64-bit address, high portion