CS9236 datasheet(13/34 Pages) CIRRUS

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CS9236

DS214PP11

MIDI IMPLEMENTATION

The CS9236 MIDI interpreter responds to all MIDI messages

specified for General MIDI Level 1.0 compliance. The GM

messages include NOTE ON, NOTE OFF, PROGRAM

CHANGE,

CHANNEL

PRESSURE,

PITCH

BEND

CHANGE, MODULATION WHEEL (Controller 1), DATA

ENTRY (Controllers 6 & 18), VOLUME (Controller 7), PAN

(Controller 10), EXPRESSION (Controller 11), DAMPER

PEDAL/SUSTAIN (Controller 64), PITCH BEND SENSI-

TIVITY (RPN 00), FINE TUNING (RPN 01), COARSE

TUNING (RPN 02), RESET ALL CONTROLLERS, and

ALL NOTES OFF.

In addition, the CS9236 MIDI interpreter responds to SOS-

TENUTO (Controller 66), EFFECT 1/REVERB SEND

LEVEL (Controller 91), EFFECT 3/CHORUS SEND LEV-

EL (Controller 93), ALL SOUNDS OFF, OMNI MODE OFF

(treated as ALL NOTES OFF), OMNI MODE ON (treated as

ALL NOTES OFF), MONO MODE ON, POLY MODE ON,

ACTIVE SENSING, SYSTEM RESET, and System Exclu-

sive messages (System Exclusive messages may be used to

enable/disable channel pressure and to enable/disable internal

test mode).

The MIDI interpreter correctly interprets MIDI data streams

transmitted using Running Status. “Running Status” is appli-

cable to Channel Voice messages and to Channel Mode Mes-

sages as follows: when a group of sequential messages in a

MIDI data stream should have the same status byte value, the

status byte must be included for the first message in the

group, but may be omitted for the subsequent messages of the

same status byte value. Running status allows long strings of

Channel Voice or Channel Mode messages to be sent using

only data bytes, with the status byte inferred by the last Chan-

nel Voice or Channel Mode status byte received. A message

with a different status byte value will reset the running status.

Note that even messages which are “ignored” or not other-

wise processed by the CS9236 will reset the running status

mode. Real-Time messages are an exception to this rule:

Real-Time messages do not affect running status.

A MIDI Implementation Chart for the CS9236 is given in Ta-

ble 3.

Channel Voice Messages

Channel Voice messages are used to control instrument voic-

es. Channel Voice messages consist of a status byte followed

by one or two data bytes. Channel Voice messages which are

processed by the CS9236 include the NOTE ON, NOTE OFF,

CONTROL CHANGE, PROGRAM CHANGE, PITCH

BEND CHANGE, and CHANNEL PRESSURE messages.

Control Change Messages

The CS9236 processes MIDI Controller numbers 1 (MODU-

LATION WHEEL), 6 (DATA ENTRY MSB), 7 (CHAN-

NEL VOLUME), 10 (PAN), 11 (EXPRESSION), 38 (DATA

ENTRY LSB), 64 (DAMPER PEDAL), 66 (SOSTENUTO),

91 (REVERB DEPTH), 93 (CHORUS DEPTH), 100 (Regis-

ter Parameter LSB), 101 (Register Parameter MSB), 120

(ALL SOUNDS OFF), and 121 (RESET ALL CONTROL-

LERS).

Registered Parameters

MIDI “Registered Parameter” data is transmitted to the

CS9236 using controller numbers 100 (Registered Parameter

LSB), 101 (Registered Parameter MSB), 6 (Data Entry

MSB), and 38 (Data Entry LSB). To transfer parameter data

to the CS9236, the parameter number for the parameter to be

updated is first selected using MIDI Controllers 100 and 101,

and then the data value for the selected parameter is transmit-

ted using controller numbers 6 and 38. The CS9236 responds

to the MIDI Registered Parameters for PITCH BEND SEN-

SITIVITY

(RPN00),

FINE

TUNING

(RPN01),

and

COARSE TUNING (RPN02).

Channel Mode Messages

The CS9236, like other popular synthesizer products, oper-

ates in a mode sometimes referred to as “Multimode”, de-

scribed as follows:

The CS9236 MIDI controller consists of 16 receiver channels

(one receiver channel for each of the 16 MIDI channels).

Each receiver channel receives MIDI messages on it's dedi-

cated MIDI channel. Each receiver channel can also receive

MODE messages on it's dedicated MIDI channel (the MIDI

channel for each receiver is also the “basic channel” for that

receiver) as follows: Each receiver channel is considered to

operate only in OMNI OFF mode, (each receiver channel can

only receive data on one MIDI channel). When a receiver

channel receives an OMNI ON message, it stops all ongoing

notes but remains in OMNI OFF mode.

Each receiver channel can accept a POLY ON message or a

MONO ON message. The POLY ON message sets the receiv-

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