Open Access
Circuit Descriptions
3-18
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
3.2.11 PC Card Interface
This schematic is shown in
A.13 PC Card Interface
on page A-14.
The PC card (PCMCIA) I/O subsystem is based around a Vadem VG-468 (U25) device.
This a PC card socket controller which is designed to connect to a PC ISA bus. In this case,
it is driven by the APB and NISA bridge. The controller supports two PC card sockets and
the associated voltage switching devices.
In order to program the controller, you are advised to obtain a data sheet from the
manufacturer. Please contact ARM if you have any problems obtaining a data sheet. It is
a complex device and a description of its internal function is outside the scope of this
document.
In combination with the voltage switching devices described in the next section the ARM
Development Board is able to support cards that require a +5V supply and a programming
voltage (VPP) of +5V or +12V.
Note
No support is provided for +3.3V PC cards.
There are two yellow LEDs (D11 and D12) attached to the VG-486 labelled PCA and PCB.
Logically, one LED is associated with each of the PC card sockets A and B. These LEDs are
connected to the GPIO pins of the controller and so can be switched on an off by writing to
an appropriate register in the device.
hrg.book Page 18 Wednesday, July 22, 1998 9:18 AM
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