CS7410 datasheet(24/39 Pages) CIRRUS

24 / 39 page

CS7410

DS553PP1

processor communication, and 32 semaphore reg-

isters are used for resource locking. Three timers

are available for general-purpose functions, as well

as more specialized functions, such as watchdog

timers and performance monitoring.

The large number of general purpose I/Os offers

flexibility in system configurations. Three separate

synchronous serial interfaces, conforming to indus-

try-standard protocols, are available for a variety of

system interface functions. Four general purpose

software interrupts and twelve hardware interrupts

help reduce peripheral overhead and improve UI

responsiveness. Power-down control of the internal

clocks is also possible. An internal PLL is used to

generate the internal system and memory clocks as

well as audio clocks for all supported sample rates.

3.6

Audio Output

Decoded audio data is written into an output FIFO

in 16-, 18-, 20- or 24-bit PCM format. A flexible

audio output stage can simultaneously output 4

channels of PCM data to external audio DACs, plus

an independent IEC-958 encoded output. The IEC-

958 output has fully programmable channel status

(commercial), and provides a flexible solution to

support all IEC-958 modes for user data. The audio

output circuit contains an auto-mute detect circuit,

which can generate internal or external mute con-

trols

PCM FIFO data up to 18 bits can also be output by

the on-board sigma-delta stereo modulator. The

sigma-delta modulator yields a typical 85 dB sig-

nal-to-noise ratio with few external components re-

quired, resulting in a low-cost, low parts count

analog front end. The modulator has a 32x upsam-

pling filter, followed by a 32x interpolator, and fi-

nally a 5th-order Sigma-Delta modulator.

The

auto-mute circuit also works on the modulator out-

put, and there are separate programmable attenua-

tors for the modulator output and both PCM

outputs.

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