GR740-UM-DS, Nov 2017, Version 1.7 223 www.cobham.com/gaisler
GR740
15.2.3 Extended PCI Configuration Space
This section describes the first item in the list of capabilities implemented in the Extended PCI Con-
figuration Space. This capability is core specific and contains the PCI to AMBA address mapping and
the option to change endianess of the PCI bus.
Table 256.GRPCI2: Internal capabilities of the Extended PCI Configuration Space
PCI address offset (with the Capabilities
pointer as base) Register
0x00 Length, Next Pointer, ID
0x04 - 0x18 PCI BAR to AHB address mapping
0x1C Extended PCI Configuration Space to AHB address mapping
0x20 AHB IO base address and PCI bus config (endianess switch)
0x24 - 0x38 PCI BAR size and prefetch
0x3C AHB master prefetch burst limit
Table 257.0x00 - Length, Next pointer and ID
31 24 23 16 15 8 7 0
RESERVED Length Next Pointer Capability ID
0
0x40
0x00 0x09
rrrr
31: 24 RESERVED
23: 16 Length - Returns 0x40.
15: 8 Next Pointer - Pointer to the next item in the list of capabilites. Set to 0x00
7: 0 Capability ID - Returns 0x09 indicating Vendor Specific.
Table 258.0x04-0x18 - PCI BAR to AHB address mapping register
31 0
PCI BAR to AHB address mapping
0
rw
31: 0 PCI BAR to AHB address mapping - 32-bit mapping register for each PCI BAR. Translate an access
to a PCI BAR to a AHB base address. The size of the BAR determine how many bits (starting form
bit 31) are implemented. Bits non implemented returns zero
Table 259.0x1C - Extended PCI Configuration Space to AHB address mapping register
31 87 0
Extended PCI Configuration Space to AHB address mapping RESERVED
00
rw r
31: 8 Extended PCI Configuration Space to AHB address mapping - Translates an access to the Extended PCI Con-
figuration Space (excluding the address range for the internal register located in this configuration
space) to a AHB address.
7: 0
RESERVED
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