TMPR4938 datasheet(285/716 Pages) TOSHIBA

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Chapter 10 PCI Controller

10-9

When expressed as a formula, conversion of a G-Bus address (GBusAddr[35:0]) into a PCI Bus

Address (PCIAddr[39:0]) is as follows below. GBASE[35:8], PBASE[39:8], and AM[35:8] each

represent the setting register of the corresponding access window indicated below in Table 10.3.2. The

“&” symbol indicates a logical AND for each bit, “||” indicates a logical OR for each bit, “!” indicates

logical NOT, and “|” indicates bit linking.

If (GBusAddr[35:8] & ! AM[35:8] == GBASE[35:8] & ! AM[35:8]) then

PCIAddr[39:0] = PBASE[39:36]

| ((PBASE[35:8] & ! AM[35:8]) || (GBusAddr[35:8] & AM[35:8]))

| GBusAddr[7:0];

Table 10.3.2 Initiator Access Space Address Mapping Register

G-Bus Base Address

GBASE[35:8]

PCI Bus Base Address

PBASE[39:8]

Address Mask

AM[35:8]

Memory Space 0

G2PM0GBASE.BA[35:8]

G2PM0PBASE.BA[39:8]

G2PM0MASK.AM[35:8]

Memory Space 1

G2PM1GBASE.BA[35:8]

G2PM1PBASE.BA[39:8]

G2PM1MASK.AM[35:8]

Memory Space 2

G2PM2GBASE.BA[35:8]

G2PM2PBASE.BA[39:8]

G2PM2MASK.AM[35:8]

I/O Space

G2PIOGBASE.BA[35:8]

G2PIOPBASE.BA[39:8]

G2PIOMASK.AM[35:8]

Figure 10.3.4 illustrates this address conversion.

Figure 10.3.4 Address Conversion For Initiator (G-Bus

→ PCI Bus Address Conversion)

It is possible to set each space to valid/invalid or to perform Word Swap (see “10.3.7 Endian

Switching Function). Table 10.3.3 shows the settings registers for these properties.

When 64-bit access is made to the initiator memory space, two 32-bit Burst accesses are issued on the

PCI Bus. 64-bit access to the I/O space is not supported.

Also, operation is not guaranteed if resources in the PCI space were made cacheable and were then

accessed when the Critical Word First function of the TX49/H3 core was enabled.

GBusAddr

0x00

Compare

GBASE

0x00

0 0 0 - --- -- -- -- -0 0 1 1 1 -- -- -- -- -- --- -- -- -- -

0x00

PBASE

PCIAddr

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