VersaLogic Fox VL-EPM-19, Hardware Reference Manual

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Expansion Interfaces
EPM-19 Hardware Reference Manual
46
Table 22 lists the pinout of the SPX connector.
Table 22: SPX Connector Pinout
Pin Signal Function
1 V5_SPX +5.0 V
2 CLK SPX Clock
3 GND Ground
4 MISO Master input, Slave output
5 GND Ground
6 MOSI Master output, Slave input
7 GND Ground
8 SS0# Chip Select 0
9 SS1# Chip Select 1
C
ABLING
An adapter cable, part number CBR-0901, is available. This is a 9-inch, 9-pin Pico-Clasp to
Dual SPX cable.
If your application requires a custom cable, the following information will be useful:
EPM
-
19 Board Connector Mating Connector
Molex 501568-0907 Molex 501330-0900
V
ERSA
L
OGIC
SPX E
XPANSION
M
ODULES
VersaLogic offers several SPX modules that provide a variety of standard functions, such as
analog input, digital I/O, CANbus controller, and others. These are small boards (1.2” x 3.775”)
that can mount on the PC/104 and PC/104-
Plus stack, using standard PC/104 stand-offs, or up to
two feet away from the base board. For more information, contact VersaLogic at
info@VersaLogic.com .
PC/104 Expansion Bus
The Vortex86DX2 ISA bus interface is an 8/16-bit ISA device with zero-wait-state and is
available through the Vortex86DX2 SoC’s internal ISA-to-PCI bridge. The maximum ISA clock
frequency is 33 MHz. The AT clock is programmable. The SoC generates refresh signals to the
ISA interface during the DRAM refresh cycle. (This means the ISA Refresh signal would be
modified with the DRAM refresh rate change from ~15
μs to ~3.9 μs).
Seven IRQs have been shown to work with the ISA bus expansion cards. As listed in Table 23,
they are IRQ3, IRQ4, IRQ5, IRQ6, IRQ7, IRQ10, and IRQ11. There are conflicts with all other
IRQ assignments per the Vortex86DX2 resources, and by default IRQ3, IRQ4, IRQ10 and IRQ11
are assigned to the four COM Ports. If the ISA expansion card requires more than three IRQs,
you may have to disable the COM Port using the desired IRQ, taking care to ensure each of the
required IRQs are reserved from PCI use in the BIOS Setup utility (PCIPnP settings). IRQ
selection often requires checking to make sure the system does not have resource conflicts.
The EPM-19 has limited support of the PC/104 bus. Most PC/104 cards will work, but be sure to
check the requirements of your PC/104 card against the resources listed in Table 23.