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5.4 Card detection and PHYSLP functions with CDI and CDO pin
5.4.1 General
The CFast card connector contains two signals, CDI and CDO. These signals enable two functions:
a. Card Detect. This function enables the host to detect when the card is fully inserted. For example, the
host may wish to power up the card only after it is inserted, or turn on an LED when the card is properly
inserted.
b. PHYSLP. This function is a CFast power management protocol which may be invoked when the SATA
connection is in Slumber mode. Please see the CFast specifications for a complete description. The
purpose of this function is to enable the device to turn off the SATA PHY completely, saving power. The
host may turn off its own PHY when invoking this function.
Swissbit F-2x0 support Card detect and PHYSLP functionality
This section explains recommended methods for the host to interface with the card so that the card will not be
damaged, and to ensure compatibility between the card and the host regarding the above described functions.
5.4.2 Connection when the host uses the Card Detect functionality only
The host needs to take into account the following restrictions:
a. CDI and CDO are shorted together on the CFast card.
b. The card may not have Vcc connected directly to CDI or to CDO.
(The newest F-2x0 cards have a serial resistor between CDI and controller)
c. The CDI – CDO signal on the F-2x0 card is connected to a card controller input pin.
d. The card doesn’t actively drive the CDI or CDO signals .
Based on the above, the following is recommended:
a. CDI will be connected to Gnd.
b. CDO will be connected to an input port on the host controller.
c. CDO will be connected to a pull-up resistor on the host. The value of the resistor is calculated so that the
voltage drop across the resistor when the card CDO is connected and CDI is not connected will not exceed
0.4V. The leakage current of the card controller is up to 1 ? A. As an example, if the host controller
leakage is also 1 ? A, the pull-up resistor may have a value of up to 200K ? . It is recommended that the
pull-up resistor value will be as high as possible in order to have no effect on the card controller and to
conserve power.
See Figure 2
Figure 2: CFast connection for Card Detect functionality only
Host Electronics
Vcc
Host
Controller
Pull-up
Gnd
CDI
Input
only
CFast card
CDO
resistor,
100KOhm to
200 KOhm
Input
only
Internal connection
(optional)
Controller
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 0.92
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
F-240_data_sheet_CA-HxBV_Rev092.doc
Page 11 of 56
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