
Principles of Operation
49
September 2005
SCPS110
Table 32. PC Card—Card Detect and Voltage Sense Connections
CCD2//CD2
CCD1//CD1
CVS2//VS2
CVS1//VS1
Key
Interface
VCC
VPP/VCORE
Ground
Open
5 V
16-bit PC Card
5 V
Per CIS (VPP)
Ground
Open
Ground
5 V
16-bit PC Card
5 V and 3.3 V
Per CIS (VPP)
Ground
5 V
16-bit PC Card
5 V, 3.3 V, and
X.X V
Per CIS (VPP)
Ground
Open
Ground
LV
16-bit PC Card
3.3 V
Per CIS (VPP)
Ground
Connect to
CVS1
Open
Connect to
CCD1
LV
CardBus PC Card
3.3 V
Per CIS (VPP)
Ground
LV
16-bit PC Card
3.3 V and X.X V
Per CIS (VPP)
Connect to
CVS2
Ground
Connect to
CCD2
Ground
LV
CardBus PC Card
3.3 V and X.X V
Per CIS (VPP)
Connect to
CVS1
Ground
Connect to
CCD2
LV
CardBus PC Card
3.3 V, X.X V,
and Y.Y V
Per CIS (VPP)
Ground
Open
LV
16-bit PC Card
X.X V
Per CIS (VPP)
Connect to
CVS2
Ground
Connect to
CCD2
Open
LV
CardBus PC Card
3.3 V
1.8 V (VCORE)
Ground
Connect to
CVS2
Connect to
CCD1
Open
LV
CardBus PC Card
X.X V and Y.Y V
Per CIS (VPP)
Connect to
CVS1
Ground
Open
Connect to
CCD2
LV
CardBus PC Card
Y.Y V
Per CIS (VPP)
Ground
Connect to
CVS1
Ground
Connect to
CCD1
LV
UltraMedia
Per query terminals
Ground
Connect to
CVS2
Connect to
CCD1
Ground
Reserved
3.5.4 Flash Media and Smart Card Detection
The PCIxx12 controller detects flash media card insertions through the SD_CD, MS_CD, SM_CD, and
XD_CD terminals. When one of these terminals is 0b, a flash media device is inserted in the respective socket.
The controller debounces these signals such that instability of the signal does not cause false card insertions.
The debounce time is approximately 50 ms. The detect signals are not debounced on card removals. The
filtered detect signals are used in the flash media card detection and power control logic.
The MMC/SD card detection and power control logic contains three main states:
Socket empty, power off
Card inserted, power off
Card inserted, power on
The controller detects a Smart Card insertion through the SC_CD terminal. When this terminal is 0b, a Smart
Card is inserted in the socket. The controller debounces the SC_CD signal such that instability of the signal
does not cause false card insertions. The debounce time is approximately 50 ms. The SC_CD signal is not
debounced on card removals. The filtered SC_CD signal is used in the Smart Card detection and power
control logic.
The Smart Card detection and power control logic contains three main states:
Socket empty, power off
Card inserted, power off
Card inserted, power on