Cirrus Logic CS4205 - Manual (Page 75)

CS4205
DS489PP4 75
This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When
configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and
220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output
(4 mA drive) or as an open drain output. This pin also provides the serial data for the first serial data
port when the SDEN bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in
the high impedance state for backward compatibility.
GPIO2/SDI1 - General Purpose I/O / Serial Data Input 1, Input/Output, Pin 39
This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When
configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and
220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output
(4 mA drive) or as an open drain output. This pin also receives the serial data for the first serial input
port when the SDI1 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the
high impedance state for backward compatibility.
GPIO3/SDI2 - General Purpose I/O / Serial Data Input 2, Input/Output, Pin 40
This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When
configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and
220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output
(4 mA drive) or as an open drain output. This pin also receives the serial data for the second serial input
port when the SDI2 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the
high impedance state for backward compatibility.
GPIO4/SDI3 - General Purpose I/O / Serial Data Input 3, Input/Output, Pin 41
This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When
configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and
220 mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output
(4 mA drive) or as an open drain output. This pin also receives the serial data for the third serial input
port when the SDI3 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the
high impedance state for backward compatibility.
ZLRCLK - ZV Port Left-Right Clock, Input, Pin 32
This pin receives the Left/Right clock for the Zoomed Video Port. The L/R clock determines which
channel is currently being inputted on the ZSDATA pin. The signal must conform to the ZV Port
Specification.
ZSDATA - ZV Port Serial Data, Input, Pin 33
This pin receives two’s complement MSB-first serial audio data for the Zoomed Video Port. The data is
clocked into the CS4205 by the ZSCLK, and the channel is determined by ZLRCLK. The signal must
conform to the ZV Port Specification.
ZSCLK - ZV Port Serial Clock, Input, Pin 34
This pin receives the serial clock for the Zoomed Video Port. The serial clock is used to clock data on
the ZSDATA pin into the CS4205. The signal must conform to the ZV Port Specification.
Power Supply Pins
DVdd1, DVss1 - Digital Supply Voltage 1 / Digital Ground 1, Pins 1 and 4