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:
"0xRR" represents the mixer register number in hexadecimal.
The grayed areas of the table represent reserved bits.
Index
D7
D6
D5
D4
D3
D2
D1
D0
0x00
Reset Mixer
0x02
Master volume
0x06
MIDI volume
0x08
CD volume
0x0A
Voice volume
Figure 4-1: Register Map of CT1335 Mixer
Содержание SB0350
Страница 29: ......
Страница 71: ...Mixer Chip Programming 4 13 Figure 4 4 Logical Schematic of the Output Mixing Paths ...
Страница 72: ...4 14 Mixer Chip Programming Figure 4 5 Logical Schematic of the Input Mixing Paths ...
Страница 141: ...Index3 ...