8 card type detection, 9 mixed voltage operation – Ricoh R5C841 User Manual
Page 32
R5C841 PCI-CardBus/IEEE 1394/SD Card/Memory Stick/xD/ExpressCard Data Sheet
12345
2004
R
EV
.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.