Filter
Top Products
R5C841 PCI-CardBus/IEEE 1394/SD Card/Memory Stick/xD/ExpressCard Data Sheet
12345 2004 REV.1.10 4-7
4.8 Card Type Detection
If once a valid insertion is detected, the socket state machine in the R5C841 starts to interrogate
the PC Card to determine whether it is a CardBus Card, a 16-bit PC Card or an ExpressCard.
The R5C841 supports VCC values of 5V, 3.3V and combination of them at the socket interface.
Card type can be known by reading the Socket Present State register.
Card Type
CD2# CD1# VS2# VS1# Key Interface Voltage
ground ground open open 5V 16bit PC Card 5V
ground ground open ground 5V 16bit PC Card 5V and 3.3V
ground ground ground ground 5V 16bit PC Card 5V, 3.3V and
X.XV
ground ground open ground LV 16bit PC Card 3.3V
ground connect to
CVS1
open connect to
CCD1#
LV CardBus
PC Card
3.3V
ground ground ground ground LV 16bit PC Card 3.3V and X.XV
connect to
CVS2
ground connect to
CCD2#
ground LV CardBus
PC Card
3.3V and X.XV
connect to
CVS1
ground ground connect to
CCD2#
LV CardBus
PC Card
3.3V, X.XV and
X.XV
ground ground ground open LV 16bit PC Card X.XV
connect to
CVS2
ground connect to
CCD2#
open LV CardBus
PC Card
X.XV
ground connect to
CVS2
connect to
CCD1#
open LV CardBus
PC Card
X.XV and Y.YV
connect to
CVS1
ground open connect to
CCD2#
LV CardBus
PC Card
Y.YV
ground connect to
CVS1
ground connect to
CCD1#
Reserved
ground connect to
CVS2
connect to
CCD1#
ground Reserved
connect to
CVS2
connect to
CVS2
connect to
CCD1#,
CCD2#
open ExpressCard
Small Card (BAY)
4.9 Mixed Voltage Operation
The R5C841 has 5 independent power rails. The power for Card (VCC_3V) and PCI
(VCC_PCI3V) is powered at 3.3V. The R5C841 can support either 3.3V or 5V for the PCI and the
PC Card, as so the R5C841’s interface has the structure of 5V tolerant. VCC_RIN and
VCC_ROUT are powered at 1.8V when an internal regulator disabled, and VCC_RIN is powered
at 3.3V when an internal regulator enabled. The 1394 OHCI interface (AVCC_PHY3V) is powered
at 3.3V. The SD Card Interface, the Memory Stick interface and the xD Picture Card interface
(VCC_3V and VCC_MD3V) are powered at 3.3V.