帮看个PCIE的显示

如下：第一列的“0000”、“0001”代表什么含义？之后紧跟着的依次为bdf吗？


0000:00:00.3 System peripheral: Freescale Semiconductor Inc Device ee01 (rev 01)
0000:00:00.4 System peripheral: Freescale Semiconductor Inc Device ee02 (rev 01)
0000:00:00.5 Fabric controller: Freescale Semiconductor Inc Device eef0 (rev 01)
0000:00:00.6 Ethernet controller: Freescale Semiconductor Inc Device e100 (rev 01)
0000:00:1f.0 Generic system peripheral [0807]: Freescale Semiconductor Inc Device e001 (rev 01)
0001:00:00.0 PCI bridge: Freescale Semiconductor Inc Device 82c1 (rev 10)