CompuLab SBC-X270 Bedienungsanleitung PDF herunterladen (Seite 33)

SB-X270 PC/104+ Single Board Computer

CompuLab LTD.

4. Functions Implemented on the SB-X270

Most of the functions are implemented by the attached CM-X270 module, while the SB-

X270 board provides connectors or headers. Several additional functions are implemented

on the SB-X270 itself and are described in this section.

Note: The SB-X270 uses a CPLD (programmable logic IC) in order to implement

combinatory logic functionality. This is done in order to reduce component count and add

some flexibility to the design. The usage of a CPLD is not obligatory and can be replaced

by discrete logic IC’s. The internal design description of the CPLD is attached to the SB-

X270 schematics package.

4.1. PC/104 and IDE addressing and logic

The SB-X270 implements address decoding logic by GPCS and IDE-CS signals from the

CM-X270 for driving a number of control signals (OE#, WE#, CS#) to the PC/104 and

IDE buses. Below is a memory address map for the above buses and relevant active control

signals:

Description Address range Active control signals

PC/104 memory

access region

0x0C000000-0x0CFFFFFF ISA-RD#, ISA-WR#

PC/104 IO access

region

0x0D000000-0x0DFFFFFF ISA-IOR#, ISA-IOW#

IDE CS1 region 0x0E000000-0x0EFFFFFF IDE-CS#1, IDE-RD#, IDE-WR#

IDE CS0 region 0x0F000000-0x0FFFFFFF IDE-CS#0, IDE-RD#, IDE-WR#

4.2. PC-Card CardBus socket

The SB-X270 implements a custom solution allowing usage of standard 32bit CardBus

cards without a need for dedicated CardBus controller.

The cards are connected directly to the PCI bus and dedicated logic blocks the CB-

FRAME# signal during irrelevant PCI configuration cycles. The O/S drivers have been

slightly modified but, in general, the solution acts as a standard CardBus interface. The

CARDBUS-CTL signal is used to control the CB-FRAME# blocking. Please refer to the

SB-X270 schematics for implementation details. Only 3.3V PC-Cards are supported.

NOTE: this solution does not allow card insertion/removal (hot-plug) while the system is

powered.

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CompuLab SBC-X270 Bedienungsanleitung Seite 33