Elton User Manual Rev 1.04
Page 36
Functional Block Diagram
The following block diagram illustrates the functional blocks of the PC/104 Module interconnected with
NVIDIA AGX Xavier Series Module, PCI/104 Express 3-Bank expansion components, and the expansion
PCI bus connector.
Figure 11.1-1: PC/104 Express Block Diagram
PC/104 Bus Framework
The PC/104 Consortium specifications framework encapsulate standards related to ISA, PCI, and PCI
Express buses used in a PC.
PC/104 Bus
The PC/104 bus is derived from the ISA bus and includes all the signals found on the ISA bus, with additional
Ground pins added to ensure bus integrity. Signal timing and voltage levels are identical to the ISA bus, with
lower current requirements. The PC/104 specification defines two versions of the bus, 8-bit and 16-bit. The
8-bit version consists of 64 pins. The 16-bit version adds 40 additional pins. The term "PC/104" denotes the
total number of 104 pins on the connector.
The pinouts for the PC/104 connector can be obtained from
site.
The signals
marked
J1
/
P1
are found only on the 8-bit version, while
J2
/
P2
are found on the 16-bit version.
PC/104 supports ISA only.
PC/104-Plus Bus
The PC/104-Plus standard adds additional support for the PCI bus, besides the PC/104 ISA bus. The
PC/104-Plus module contains a PC/104 connector and an additional 120-pin connector for the PCI bus that
is located on the opposite side of the board from the PC/104 connector.
The pinouts for the PCI connector can be obtained from the
Boards equipped with PC/104-Plus accommodate both buses that interconnect with both ISA and PCI
peripheral cards.
PC/104-Plus supports PCI and ISA only.
PCI-104 Bus
The PCI-104 form factor incorporates the PCI connector but not the PC/104 connector. It contains 120 pins.
The PCI connector location and pinout is identical to PC/104-Plus and does not include the ISA bus.
PCI-104 and PC/104-Plus are compatible since they both utilize the PCI bus and also the same PCI Slot
Number selection scheme, where each device must be assigned a unique slot number.
PCI-104 supports PCI only.
