Ct1335 Mixer; Features; Register Functions; Figure 4-1 Register Map Of Ct1335 Mixer - Creative SB0350 Programming Manual

4-4 Mixer Chip Programming

CT1335 Mixer

This section describes the features and register functions of the CT1335 mixer chip
used on the Sound Blaster 2.0 CD Interface card.

Features

CT1335 is a mono mixer chip that only controls the output mixing. It has the
following features:
Volume Control
CT1335 provides independent 8-level volume control for the Master, MIDI and CD
sources.
The Voice source has 4-levels of volume control.
Output Mixing
The output mixing path takes signals from the Voice, MIDI and CD, as well as the
PC Speaker. To silence a source, you can either reduce the source volume to zero or
terminate the source activity.

Register Functions

The following notations are used to describe the detailed register map of CT1335:
D7
Index
0x00
0x02
0x06
0x08
0x0A
"0xRR" represents the mixer register number in hexadecimal.
The grayed areas of the table represent reserved bits.
D6 D5 D4
Figure 4-1: Register Map of CT1335 Mixer
D3 D2
Reset Mixer
Master volume
MIDI volume
CD volume
Voice volume
D1 D0