Just guessing...
19 could be "bus 0, device 3, function 1".
Devmanview shows (for my pc):
- PCI standard host CPU bridge
PCI\VEN_1022&DEV_1422&SUBSYS_14221849&REV_00\3&11583659&0&00
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,0,0)
When I check its location (device manager, properties, details, location information), I get: bus 0 device 0 function 0
- AMD Radeon(TM) R7 Graphics
PCI\VEN_1002&DEV_130F&SUBSYS_130F1849&REV_00\3&11583659&0&08
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,1,0)
Location:bus 0 device 1 function 0
- PCI standard host CPU bridge
PCI\VEN_1022&DEV_1424&SUBSYS_00000000&REV_00\3&11583659&0&10
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,2,0)
Location:bus 0 device 2 function 0
- PCI standard host CPU bridge
PCI\VEN_1022&DEV_1424&SUBSYS_00000000&REV_00\3&11583659&0&18
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,3,0)
Location:bus 0 device 3 function 0
- PCI Express Root Port
PCI\VEN_1022&DEV_1426&SUBSYS_12341022&REV_00\3&11583659&0&1A
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,3,2)
Location:bus 0 device 3 function 2
- PCI standard host CPU bridge
PCI\VEN_1022&DEV_1424&SUBSYS_00000000&REV_00\3&11583659&0&20
@System32\drivers\pci.sys,#65536;PCI bus %1, device %2, function %3;(0,4,0)
Location:bus 0 device 4 function 0
I.e.:
bus 0 device 0 function 0 = (0,0,0) = 00
bus 0 device 0 function 1 = (0,0,1) = 01
bus 0 device 0 function 2 = (0,0,2) = 02
bus 0 device 0 function 3 = (0,0,3) = 03
bus 0 device 0 function 4 = (0,0,4) = 04
bus 0 device 0 function 5 = (0,0,5) = 05
bus 0 device 0 function 6 = (0,0,6) = 06
bus 0 device 0 function 7 = (0,0,7) = 07
bus 0 device 1 function 0 = (0,1,0) = 08
bus 0 device 0 function 2 = (0,0,1) = 09
bus 0 device 0 function 3 = (0,0,2) = 0a
bus 0 device 0 function 4 = (0,0,3) = 0b
bus 0 device 0 function 5 = (0,0,4) = 0c
bus 0 device 0 function 6 = (0,0,5) = 0d
bus 0 device 0 function 7 = (0,0,6) = 0e
bus 0 device 2 function 0 = (0,0,7) = 0f
bus 0 device 2 function 1 = (0,2,0) = 10
And so forth...