VULCAN Technical Manual
Detailed hardware description
© 2007 Eurotech Ltd Issue D
35
Expansion interfaces
CompactFlash
A CompactFlash extension socket for full I/O mode operation is provided using the PCI
bus interface of the IXP425 processor and a PCI/CardBus bridge to support Type I,II
CF+ cards. For this purpose, PCI to CardBus Bridge Texas Instruments PCI1520
device,
with support for 2 CardBus slots, is used. The other slot is used to interface
with PC/104 ISA bus.
The standard 50 pin CompactFlash connector J6 is interfaced to slot A of the PCI1520
controller. This is a hot-swappable 3.3V/5V interface, controlled by the detection of
CompactFlash card insertion. A PC card
power-interface switch controls the power and
protects against short-circuit conditions. For details, see
, page
.
CF+ is a small form factor card standard. It encompasses CompactFlash (CF) Flash
data storage cards, magnetic disk cards and I/O cards including serial cards, Ethernet
cards, fax/modem cards, digital phone cards, USB, barcode scanners, Bluetooth,
802.11b wireless LAN, wireless digital cell phone cards, etc. For more details about
CF+ standards and availability of particular CF+ peripherals, see
.
The CF+ card provides high capacity data storage and I/O functions that electrically
comply with the Personal Computer Memory Card International Association (PCMCIA)
standard.
PCI1520 MFUNC pin assignments
The following table summarises the use of the 6 MFUNC pins of PCI/CardBus Bridge
PCI1520, their direction and their active level:
MFUNC Signal name
Direction Active Function
See section…
0
CF_INTB#
Output Low CF PCI interrupt
,
page
.
1
CLK_SHDOWN#
Output Low Clock
shutdown
, page
2
ISACTL_EN#
Output Low PC/104
enable
page
.
3
NC
Not
connected
4
USB_SEL2PORTS
Output High USB select 2 ports
, page
5
PWRSAVE
Output High Ethernet PHY &
UART power save
, page
It is the responsibility of software to setup these MFUNC port pins correctly.