CS4630

32

DS445PP1

VAUX_SEL - Select 3.3 Vaux, Output, Active High

This pin is used to switch the on-card power MOSFET’s to support 3.3 Vaux supply when

PCIVDD_SENSE - Sense Main System 3.3 V, Input, Active High, Weak Internal Pulldown

This pin is used to determine the presence of the main 3.3 V supply. This signal is used in

connected.

VAUX_SENSE - Sense 3.3 Vaux, Input, Active High, Weak Internal Pulldown

This pin is used to determine the presence of the auxiliary 3.3 Vaux supply. This signal is used

connected.

12.3 External Interface Pins

TEST - Test Mode Strap, Input, Active High

This pin is sampled at reset for test mode entry. If it is high at reset, test mode is enabled. This

pin must be pulled to ground for normal operation.

EEDAT/PCGNT# - EEPROM Data Line / PC/PCI Grant, I/O

For add-in card designs, this is the data line for external serial EEPROM containing device

configuration data. When used with an external EEPROM (EEPDIS must be low), a 4.7 k

Ω

pullup resistor is required. In motherboard designs using PC/PCI, this pin is the PC/PCI

serialized grant input. In designs with neither of the above requirements, this pin can be used as

a general purpose input or open drain output (GPIO2).

EECLK/PCREQ# - EEPROM Clock Line / PC/PCI Request, Output

For add-in card designs, this is the clock line for external serial EEPROM containing device

configuration data (EEPDIS must be low). In motherboard designs using PC/PCI, this pin is the

PC/PCI serialized request output. In designs with neither of the above requirements, this pin

can be used as a general purpose output pin (GPOUT).

EEPDIS - EEPROM Disable, Input, Active High

This strapping pin, when tied high, disables the EEPROM interface. When low, the CS4630

checks at power-up for an external EEPROM on the EECLK and EEDAT pins.

SDIN2/GPIO - Serial Data Input 2 / General Purpose I/O Pin, I/O

This dual function pin defaults as a general purpose I/O pin. In non-AC ’97 system

configurations, this pin can function as a second stereo digital data input pin if enabled.