CS9236-CQ データシートの表示（PDF） - Cirrus Logic

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CS9236-CQ

Single-Chip Wavetable Music Synthesizer

Cirrus Logic 

CS9236

GENERAL DESCRIPTION

The CS9236 is a complete 32-note General MIDI music syn-

thesizer with integral digital effects processing in a single de-

vice. This device accepts a standard serial MIDI data stream

at 31.25 kbit/s and generates a stereo digital audio output data

stream at 44.1 ksample/s sampling rate. The device operates

from a single 3.3VDC supply. The digital inputs to the device

are 5V tolerant, allowing direct connection to parts which are

powered from 5V or 3V supplies. The CS9236 has been de-

signed to interface directly with the Crystal Semiconductor

CS4236B/37B/38B Single Chip Audio Systems and with the

CS4333 Stereo D/A Converter (DAC). When the CS9236 is

used in conjunction with the CS4236B/37B/38B, the digital

audio output from the CS9236 is input to the CS4236B/37B/

38B in digital format, so no separate DAC is required. In ap-

plications which require an analog output from the CS9236,

the CS4333 DAC is employed to convert the digital audio

output of the CS9236 into analog format.

CS9236/CS4236B/37B/38B Typical Connections

The CS9236 combined with the CS4236B/37B/38B provides

a complete ISA Plug-and-Play compatible sound system for

multimedia PC applications. Figure 1 depicts the typical con-

nections between the CS9236 and the CS4236B/37B/38B. In

this application, the CS4236B/37B/38B 16.9344 MHz

MCLK gated clock output drives the CS9236 MCLK5I input,

eliminating the need for a separate quartz crystal circuit.

MIDI messages are sent from the host PC to the CS4237B

over the ISA bus. The CS4236B/37B/38B provides a Plug-

and-Play configurable MPU-401 UART mode-compatible

ISA MIDI interface. The CS4236B/37B/38B MPU-401

UART function transmits the MIDI data received over the

ISA bus to the CS9236 (and to the Joystick MIDI Out pin) in

serial format. The CS9236 interprets the MIDI messages and

generates the appropriate musical sounds. These sounds are

output in serial digital audio format at the CS9236 SOUT pin.

The digital audio output from the CS9236 is input directly

into the CS4236B/37B/38B, eliminating the need for a sepa-

rate DAC.

For more details on using the CS9236 with the CS4236B/

37B/38B, see Application Note 92, "Configuring the

CS423xB/CS9236 Wavetable Interface."

Figure 1. CS9236/CS4236B, CS4237B or CS4238B Typical Connections

DS214PP11

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