CS4923 datasheet(51/56 Pages) CIRRUS

51 / 56 page

CS4923/4/5/6/7/8/9

DS262F2

WR, DS, EMWR, GPIO10—Host Write Strobe or Host Data Strobe or External Memory Write

Enable or General Purpose Input & Output Number 10: Pin 4

In Intel parallel host mode, this pin serves as the active-low data-write-input strobe. In

Motorola parallel host mode, this pin serves as the active-low data-strobe-input signal. In serial

host mode, this pin can serve as the external-memory active-low write-enable output signal.

Also in serial host mode, this pin can serve as a general purpose input or output bit.

BIDIRECTIONAL - Default: INPUT

CS—Host Parallel Chip Select, Host Serial SPI Chip Select: Pin 18

In parallel host mode, this pin serves as the active-low chip-select input signal. In serial host

SPI mode, this pin is used as the active-low chip-select input signal. INPUT

RESET—Master Reset Input: Pin 36

Asynchronous active-low master reset input. Reset should be low at power-up to initialize the

CS4923/4/5/6/7/8/9 and to guarantee that the device is not active during initial power-on

stabilization periods. At the rising edge of reset the host interface mode is selected contingent

on the state of the RD, WR and PSEL pins. Additionally, an autoboot sequence can be initiated

if a serial control mode is selected and ABOOT is held low. If reset is low all bidirectional pins

are high impedance inputs. INPUT

SCDIO, SCDOUT, PSEL, GPIO9—Serial Control Port Data Input and Output, Parallel Port

Type Select: Pin 19

In I2C mode, this pin serves as the open-drain bidirectional data pin. In SPI mode this pin

serves as the data output pin. In parallel host mode, this pin is sampled at the rising edge of

RESET to configure the parallel host mode as an Intel type bus or as a Motorola type bus. In

parallel host mode, after the bus mode has been selected, the pin can function as a general-

purpose input or output pin. BIDIRECTIONAL - Default: INPUT

In I2C mode this pin is an OPEN DRAIN I/O and requires a 4.7k Pull-Up

EXTMEM, GPIO8—External Memory Chip Select or General Purpose Input & Output Number

8: Pin 21

In serial control port mode, this pin can serve as an output to provide the chip-select for an

external byte-wide ROM. In parallel and serial host mode, this pin can also function as a

general-purpose input or output pin. BIDIRECTIONAL - Default: INPUT

INTREQ, ABOOT—Control Port Interrupt Request, Automatic Boot Enable: Pin 20

Open-drain interrupt-request output. This pin is driven low to indicate that the DSP has

outgoing control data and should be serviced by the host. Also in serial host mode, this signal

initiates an automatic boot cycle from external memory if it is held low through the rising edge

of reset. OPEN DRAIN I/O - Requires 4.7k Ohm Pull-Up

AUDATA2—Digital Audio Output 2: Pin 39

PCM multi-format digital-audio data output, capable of two-channel 20-bit output. This PCM

output defaults to DGND as output until enabled by the DSP software. OUTPUT

CS4923 датащи(PDF) 51 Page - Cirrus Logic