CS4235 Datasheet, PDF (50/94 Pages) Cirrus Logic – CrystalClear Low Cost ISA Audio System

CS4235
CrystalClear ^TM Low Cost ISA Audio System
FM Volume Scaling (X19)
Default = xeeexxxx
D7 D6 D5 D4 D3 D2 D1 D0
res FMS2 FMS1 FMS0 res res res res
FMS2-FMS0
FM Volume Scaling relative to wave-
table digital input. These bits are
provided for backwards compatibility
with previous chips. These bits are
initialized through Hardware Configu-
ration data.
010 - 0 dB
011 - +6 dB
100 - -12 dB
101 - -6 dB
110 - +12 dB
111 - +18 dB
Reserved (X20)
Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
res res res res res res res res
res
Reserved. Could read as 0 or 1.
Reserved (X21)
Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
res res res res res res res res
res
Reserved. Could read as 0 or 1.
Reserved (X22)
Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
res res res res res res res res
res
Reserved. Could read as 0 or 1.
3D Space Control (X23)
Default = 0000xxxx
D7 D6 D5
SPC3 SPC2 SPC1
D4
SPC0
D3 D2 D1 D0
res res res res
This register and C2 access the same data.
SPC3-SPC0
Space control for 3D sound.
Control’s the "width" of the sound ex-
pansion with increasing numbers
giving decreasing space affects. The
least sigificant bit represents 1.5 dB
of attenuation, with 0000 = 0 dB (full
space affect).
CS9236 Wavetable Control (X24)
Default = 0exxee00
D7 D6 D5 D4 D3 D2 D1 D0
VCIE VCF1 res res WTEN VCEN DMCLK BRES
This register and C8 access the same data.
BRES
Force BRESET low. When set, the
BRESET pin is forced low. Typically
used for power management of pe-
ripheral devices.
DMCLK
Disable MCLK. When set, the MCLK
pin of the CS9236 Wavetable Syn-
thesizer serial interface is forced low
providing a power savings mode.
VCEN
Volume Control Enable. When set,
the UP, DOWN, and MUTE pins be-
come active and provide hardware
master volume control for the line
outputs. Note that this bit can be in-
itialized at power-up through
Hardware Configuration data, Misc.
Configuration Byte.
WTEN
Wavetable Serial Port Enable. When,
set, the CS9236 Single-Chip Wave-
table Music Synthesizer serial port
pins are enabled. WTEN can be in-
itialized in the E²PROM Hardware
Configuration data, Global Configura-
tion byte.
50
DS252PP2