Texas Instruments PCI7421 Flash Media Card Detection, CD2//CCD2 CD1//CCD1 VS2//CVS2 VS1//CVS1

Table 3−2. PC Card—Card Detect and Voltage Sense Connections

CD2//CCD2	CD1//CCD1		VS2//CVS2	VS1//CVS1		Key	Interface	VCC	VPP/VCORE
Ground		Ground	Open		Open	5 V	16-bit PC Card	5 V	Per CIS (VPP)
Ground		Ground	Open		Ground	5 V	16-bit PC Card	5 V and 3.3 V	Per CIS (VPP)
Ground		Ground	Ground		Ground	5 V	16-bit PC Card	5 V, 3.3 V, and	Per CIS (VPP)
								X.X V
Ground		Ground	Open		Ground	LV	16-bit PC Card	3.3 V	Per CIS (VPP)
Ground		Connect to	Open		Connect to	LV	CardBus PC Card	3.3 V	Per CIS (VPP)
		CVS1			CCD1
Ground		Ground	Ground		Ground	LV	16-bit PC Card	3.3 V and X.X V	Per CIS (VPP)
Connect to		Ground	Connect to		Ground	LV	CardBus PC Card	3.3 V and X.X V	Per CIS (VPP)
CVS2			CCD2
Connect to		Ground	Ground		Connect to	LV	CardBus PC Card	3.3 V, X.X V,	Per CIS (VPP)
CVS1					CCD2			and Y.Y V
Ground		Ground	Ground		Open	LV	16-bit PC Card	X.X V	Per CIS (VPP)
Connect to		Ground	Connect to		Open	LV	CardBus PC Card	3.3 V	1.8 V (VCORE)
CVS2			CCD2
Ground		Connect to	Connect to		Open	LV	CardBus PC Card	X.X V and Y.Y V	Per CIS (VPP)
		CVS2	CCD1
Connect to		Ground	Open		Connect to	LV	CardBus PC Card	Y.Y V	Per CIS (VPP)
CVS1					CCD2
Ground		Connect to	Ground		Connect to	LV	UltraMedia	Per query terminals
		CVS1			CCD1
Ground		Connect to	Connect to		Ground		Reserved		Reserved
		CVS2	CCD1

3.5.4Flash Media Card Detection

The PCI7x21/PCI7x11 controller detects an MMC/SD card insertion through the MC_CD_0 terminal. When this terminal is 0, an MMC/SD card is inserted in the socket. The PCI7x21/PCI7x11 controller debounces the MC_CD_0 signal such that instability of the signal does not cause false card insertions. The debounce time is approximately 50 ms. The MC_CD_0 signal is not debounced on card removals. The filtered MC_CD_0 signal is used in the MMC/SD 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 PCI7x21/PCI7x11 controller detects a Memory Stick card insertion through the MC_CD_1 terminal. When this terminal is 0, a Memory Stick card is inserted in the socket. The PCI7x21/PCI7x11 controller debounces the MC_CD_1 signal such that instability of the signal does not cause false card insertions. The debounce time is approximately 50 ms. The MC_CD_1 signal is not debounced on card removals. The filtered MC_CD_1 signal is used in the Memory Stick card detection and power control logic.

The Memory Stick card detection and power control logic contains three main states:

•Socket empty, power off

•Card inserted, power off

•Card inserted, power on

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