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1.2.3 PC Card Interface
The PC Card interface has two modes: the 16-bit interface mode and the
CardBus 32-bit interface mode.
- Damping resistor on CCLK terminal
A series-damping resistor is recommended on the CCLK signal. The
damping resistor is system dependent. If line impedance is in the 60–90-Ω
range, a 47-Ω resistor is recommended (see
PC Card Standard,
Revision 7
).
- CD line filtering
PCI445X device has the advanced CDx line filtering circuit. It provides
90 µs of noise immunity. A 270-pF filtering capacitor is still recommended
for each of the power supply terminals: V
CC
, V
CCS
, and V
CCP
.
- Socket power supply
Socket power is supplied through TPS22X6 power switches. The
PCI445X device requires V
CCA
and V
CCB
for the protection of the other
device(s) on the bus.
1.2.4 2-Wire (I
2
C) Interface for EEPROM
The PCI445X device can load configuration registers from EEPROM after
G_RST
assertion. The SDA and SCL lines require pullup resistors to enable
this function. Depending on the EEPROM requirements, the SDA and SCL
lines must be pulled up to 3.3 V or 5 V.
Figure 1–3. EEPROM 2-Wire Interface
EEPROM
SDA
SCL
PCI445X
TPS22X6
EEPROM slave address should be 101 0000b.