ISIS user manual
Issue E
22
PC/104 bus interface
PC/104 bus interface (
) supports 16-bit ISA compatible peripherals.
Standard 64+40 way 0.1" stack-through connectors are used. See page 36 for connector
pin details.
If you are using a PC/104 card that re5V, this is automatically supplied via the
PC/104 header. +12V, –12V and –5V are only available if you connect the +12V, -12V
and –5V pins on the power connector J9 to a supply; otherwise they must be supplied
directly to the PC/104 stack.
An ISA compatible bus is implemented using the ITE IT8888G PCI/ISA bridge connected
to the Tundra Tsi381 PCIe/PCI bridge. As Tsi381 does not support a subtractive decode
option, positive decode for ISA address space has been used. This means that memory
and IO windows within PCI/ISA bridge and US15W SCH have to be configured.
Due to this specific implementation of the PC/104 bus, the I/O base address for the ISA
peripherals has been set by BIOS to 0x3000 and the accessible I/O range is 768 bytes.
The drivers for PC/104 modules have to be modified to accommodate for this. For
example, if PC/104 module uses the IO address 0x240, the driver will have to use the
base address 0x3240.
The ISA memory range of 1MB is configured by BIOS at the base address 0x08000000.
As the US15W SCH does not support legacy DMA, so there is no DMA support on the
ISA bus. Only 8/16-bit memory and IO PC/104 cards are supported.
PCI Express Mini Card socket
A PCI Express Mini Card socket is available on the ISIS for wireless connectivity or other
functionality.
There are two PCI Express root ports available from the CPU module’s interface
connector. Port 1 is used on the ISIS to implement a parallel PCI bus (through a
PCIe/PCI bridge), and Port 2 is used to connect directly to the PCIe Mini Card socket.
USB 2.0 port 6C (via USB2513i USB Hub) and SMBus (supported by US15W SCH) are
also routed to the PCIe Mini Card socket. The required signals from a SIM card socket
mounted onto the ISIS board are also routed to the PCIe Mini Card socket. A +3.3V and
+1.5V power supply lines are routed to the PCIe Mini Card socket to provide power to the
card.
For more information on PCI Express Mini Cards, see
For socket pinout details, see page
Pin 20 of the PCI Express Mini Card socket is connected to SuperIO (GP55) for use with
wireless modems (W_DISABLE# signal). Some wireless modems require that you toggle
this signal to enable normal operation.
Summary of Contents for ISIS XL-1.1-M512-F2G-GPS-I
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