DS292PP3

CIRRUS LOGIC PRELIMINARY PRODUCT BULLETIN JUNE 30, 5:03 PM

21

CS4614

CrystalClear™ SoundFusion™ PCI Audio Accelerator

External Interface Pins

TEST - Test Mode Strap, Input, Pin 51

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, Pin 80

For expansion card designs, this is the data line for external serial EEPROM containing device

configuration data. When used with an external EEPROM, 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, Pin 79

For expansion card designs, this is the clock line for external serial EEPROM containing device

configuration data. 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).

SDIN2/GPIO - Serial Data Input 2 / General Purpose I/O Pin, I/O, Pin 66

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.

VOLUP/XTALI - Volume-Up Button / Crystal In, Input, Pin 70

This dual function pin is either the volume-up button control input or the crystal oscillator input

pin, depending on system configuration. This pin may also be used as a general purpose input

if its primary function is not needed.

VOLDN/XTALO - Volume-Down Button / Crystal Output, I/O, Pin 71

This dual function pin is either the volume-down button control input or the crystal oscillator

output pin, depending on system configuration. This pin may also be used as a general purpose

input if its primary function is not needed.