VersaLogic VL-EBX-37, Reference Manual

Page: 39 / 71

Interfaces and Connectors
EBX-37 Reference Manual
33
Expansion Bus (J16, J20/J21)
PC/104-P
LUS
– PCI (J16)
PC/104- Plus modules can be secured directly to the top of the VL-EBX-37. The VL-EBX-37 is
compliant with revision 2.3 of the PC/104- Plus specification and can support four bus master
capable PC/104- Plus modules. The BIOS automatically allocates I/O and memory resources.
CMOS Setup may be used to select IRQ assignment. (See the PC/104-Plus resource page .)
PC/104 – ISA (J20/J21)
The VL-EBX-37 provides full support of the PC/104 (ISA) bus, including support of 16-bit I/O
and memory transfers. PC/104 modules can be added to the stack above the VL-EBX-37. Most
PC/104 cards will work, but be sure to check the requirements of your PC/104 card against the
limitations listed below.
Available I/O Ranges
The following I/O ranges are available to the ISA bus:

019h – 01Eh

022h – 023h

026h – 027h

02Ah – 02Bh

032h – 033h

036h – 037h

03Ah – 03Bh

03Eh – 03Fh

043h – 04Dh

053h – 05Fh

063h

065h

067h – 070h

078h – 07Fh

0A2h – 0A3h

0A6h – 0A7h

0AAh – 0ABh

0AEh – 0AFh

0B6h – 0B7h

0BAh – 0BBh

0BEh – 0BFh

0D2h – 0DDh

0E0h – 0EFh

0F1h – 207h

210h – 2F7h

300h – 3BFh

3E0h – 3F7h

400h – 4CFh

4D2h – 4FFh

580h – BFFh

D00h
Available base I/O addresses for COM ports are: 220h, 228h, 238h, 338h, 3F8h, 2F8h, 3E8h, and
2E8h.
Available Memory Ranges
The following memory range is available on the ISA bus:

A0000h – B7FFFh

D0000h – DFFFFh
IRQ S
UPPORT
The following IRQs are available on the ISA bus: IRQ 3, IRQ 4, IRQ5, and IRQ 10.
Each of the four IRQs must be enabled in CMOS Setup before they can be used on the ISA bus.
Because ISA IRQ sharing is not supported, make sure that any IRQ channel used for an ISA
device is not used elsewhere. For example, if ISA IRQ 4 is enabled, you must use a different IRQ
for COM1.
DMA and Bus Master Support
The VL-EBX-37 does not support PC/104 DMA or bus mastering.