Ricoh R5C841 - Manual (Page 53)

R5C841 PCI-CardBus/IEEE 1394/SD Card/Memory Stick/xD/ExpressCard Data Sheet
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4.25 ExpressCard Interface
Using the external USB host interface enables the R5C841 to connect a USB device to a PC Card
socket. That is, inserting an ExpressCard passive adapter into the PC Card socket can support an
ExpressCard for the USB interface.
R5C841
USBDP
USBDM
IORD#
IOWR#
A22
VCC3EN#
USBD+
USBD-
CPUSB#
+3V
USB
HOST
Power
S/W
ExpressCard
Passive Adapter
ExpressCard
4.26 BAY Function
With the PC Card passive adapter, the Small Card (the SD Card, the Memory Stick, the xD Picture
Card), can be inserted in the PC Card slot. To enable this function, set “1” in PCI-CardBus Bridge
Configuration register B7 [0]. (Internal Bay Mode)
Set PCI-CardBus Bridge Configuration register A0 [14] to “1” in order to use the External BAY
function. (*External Bay Mode)
You can also set these registers by using Serial ROM.
*To use the External Bay Mode, you also need to wire the 6 pins of Pin Name 1 to the 6 pins
of Pin Name 2 respectively.
Pin Name 1 Pin Name 2
CE2# MDIO08
WE# MDIO09
CADR0 MDIO10
CADR1 MDIO11
CADR2 MDIO12
CADR3 MDIO13