Specifications

PCIe/104 and PCI/104-Express Specification Revision 3.0 February 17, 2015 Page 37
Figure 4-4 illustrates a stack that has PCI/104-Express Host with the PCIe/104 bus connected top and bottom with
PCIe/104, PC/104-Plus, and PCI-104 peripherals. In this configuration Connector A, PCIe/104, could be either Type 1 or
Type 2. Because of the requirement that each type of bus must completely reside on one side of the Host in order to avoid
bus splits and signal stubs, only PCI-104 and PCIe/104 modules can be used in this configuration. In this example all of
the PCI-104 boards are on the bottom side of the Host and all of the PCIe/104 modules are on the top side of the Host.
The reverse configuration is also valid.
PC/104-Plus Peripheral Module with PCI to ISA Bridge
PCI Device
PCI/104-Express CPU Module
PCIe
Processor Chi
p
Chi
p
set
0.600 inches
(15.24 mm)
PCI-104 Peripheral Module
Memor
y
PCI
PCI
0.600 inches
(15.24 mm)
0.600 inches
(15.24 mm)
PCI
PCI
PCI
0.600 inches
(15.24 mm)
PCI-104 Peripheral Module
PCI
PC/104-Plus Peri
p
heral Module
PCI Device
PCI
PCI
PCI
PCIe/104 Peripheral Module
PCIe
PCIe Device
0.600 inches
(15.24 mm)
PCIe/104 Peripheral Module
PCIe
PCIe Device
0.600 inches
(15.24 mm)
PCIe/104 Peripheral Module
PCIe
PCIe Device
0.600 inches
(15.24 mm)
PCIe/104 Peripheral Module
PCIe
PCIe Device
0.600 inches
(15.24 mm)
PCI Device
PCI Device
Figure 4-4: PCI/104-Express Combined Stack-UP and Stack-DOWN Configuration Example