CS4923/4/5/6/7/8/9
FILT2—Phase Locked Loop Filter: Pin 32
Connects to an external filter for the on-chip phase-locked loop. This pin does not meet Cirrus
Logic’s ESD tolerance of 2000 V using the human body model. This pin will tolerate ESD of
1000 V using the human body model.
CLKIN—Master Clock Input: Pin 30
CS4923/4/5/6/7/8/9 clock input. When in internal clock mode (CLKSEL == DGND), this input
is connected to the internal PLL from which all internal clocks are derived. When in external
clock mode (CLKSEL == VD), this input is connected to the DSP clock. INPUT
CLKSEL—DSP Clock Select: Pin 31
This pin selects the clock mode of the CS4923/4/5/6/7/8/9. When CLKSEL is low, CLKIN is
connected to the internal PLL from which all internal clocks are derived. When CLKSEL is
high CLKIN is connected to the DSP clock. INPUT
DATA7, EMAD7, GPIO7—Pin 8
DATA6, EMAD6, GPIO6—Pin 9
DATA5, EMAD5, GPIO5—Pin 10
DATA4, EMAD4, GPIO4—Pin 11
DATA3, EMAD3, GPIO3—Pin 14
DATA2, EMAD2, GPIO2—Pin 15
DATA1, EMAD1, GPIO1—Pin 16
DATA0, EMAD0, GPIO0—Pin 17
In parallel host mode, these pins provide a bidirectional data bus. If a serial host mode is
selected, these pins can provide a multiplexed address and data bus for connecting an 8-bit
external memory. Otherwise, in serial host mode, these pins can act as general-purpose input or
output pins that can be individually configured and controlled by the DSP.
BIDIRECTIONAL - Default: INPUT
A0, SCCLK—Host Parallel Address Bit Zero or Serial Control Port Clock: Pin 7
In parallel host mode, this pin serves as one of two address input pins used to select one of four
parallel registers. In serial host mode, this pin serves as the serial control clock signal,
2
specifically as the SPI clock input or the I C clock input. INPUT
A1, SCDIN—Host Parallel Address Bit One or SPI Serial Control Data Input: Pin 6
In parallel host mode, this pin serves as one of two address input pins used to select one of four
parallel registers. In SPI serial host mode, this pin serves as the data input. INPUT
RD, R/W, EMOE, GPIO11—Host Parallel Output Enable or Host Parallel R/W or External
Memory Output Enable or General Purpose Input & Output Number 11: Pin 5
In Intel parallel host mode, this pin serves as the active-low data bus enable input. In Motorola
parallel host mode, this pin serves as the read-high/write-low control input signal. In serial host
mode, this pin can serve as the external memory active-low data-enable output signal. Also in
serial host mode, this pin can serve as a general purpose input or output bit.
BIDIRECTIONAL - Default: INPUT
50
DS262F2
CIRRUS [ CIRRUS LOGIC ]
