cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 23

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cs4237b

Manufacturer Part Number
cs4237b
Description
Crystalclear Advanced Audio System With 3d Sound
Manufacturer
Cirrus Logic, Inc.
Datasheet

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res
SPS
WTEN
SLAD
VCF1,0
DS213PP4
HW Config. Byte 8: Global Configuration Bits,
Default = 00000000
IFM
D7
VCF1
D6
VCF0
D5
Must be set to zero to allow compat-
ibility with future upgrades.
DSP Serial Port Switch. When
set, switches the DSP serial port
pins from the second joystick to the
XD4-XD1 pins. Then, when SPE in
I16 is set, the XD4-XD1 pins convert
to the DSP serial port pins. Once
this bit is enabled, the SD bus will
not be driven when accesses occur
to peripheral port devices. This func-
tion is also available in C8.
WaveTable Serial Port Enable. When
set, forces XD7-XD5 pins to convert
to the CS9236 Single-Chip Wave-
table Music Synthesizer serial port
pins. Once this bit is enabled, the
SD bus will not be driven when ac-
cesses occur to peripheral port
devices. This function is also avail-
able in C8.
Soundblaster Alternate Line Disable.
When clear, Sound Blaster (SB)
Synthesizer Volume changes affect
the LINE Alternate (X0/X1) volume.
When set, SB Synthesizer Volume
changes do not affect X0/X1 regis-
ters.
Hardware Volume Control Format.
These bits control the format of the
hardware volume control pins UP,
DOWN, and MUTE. The volume con-
trol is enabled by setting VCEN in
the previous Hardware Configuration
byte.
00 - MUTE is a toggle switch. When
01 - MUTE is a momentary switch.
MUTE is low, the volume is muted.
MUTE toggles between mute and
un-mute. Pressing the up or down
switch always un-mutes.
SLAD WTEN
D4
D3
SPS
D2
D1
res
D0
res
IFM
CB7-CB0
The next 7 bytes are reserved for future expan-
sion and must be set to their default values as
listed in Table 2
The next byte of hardware configuration data is
byte 17 in Table 2. This byte determines the
function of the XCTL0/XA2 pin. The default of
0, forces the pin to the control function XCTL0,
and the external peripheral port supports only 4
I/O locations through XA0-XA1. If this byte is
set to 08h, the pin switches to the XA2 function
and the peripheral port supports 8 I/O locations
through XA2-XA0.
The next byte, listed as byte 18, is reserved for
future expansion and must be set to 0x48.
HW Config. Byte 9: Code Base Byte,
Default = 00001011
CB7
D7
CB6
D6
CB5
D5
10 - MUTE is not used. Two button
11 - UP pin is not used. The
Internal FM. When set, the internal
FM synthesizer is enabled. When
clear, FM must be provided on the
external LINE analog inputs.
Code Base Byte. Determines the code
base located in the E
correct, the Firmware code after the
PnP resource data is not loaded.
0x0B - CS4237B
0x43 - CS4236
volume control. Pressing the up
and down buttons simultaneously
causes the volume to mute.
Pressing up or down un-mutes.
MUTE pin functions as the Up
function. With this exception, this
mode functions similarly to the
pervious two-button mode. This
mode provides backwards
compatibility with the CS4236.
CB4
D4
CB3
D3
CB2
D2
2
PROM. If not
CS4237B
CB1
D1
CB0
D0
23

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