cs4239 Cirrus Logic, Inc., cs4239 Datasheet - Page 60

• Manufacturer Part Number: cs4239
• Description: Crystalclear? Ortable Isa Audio System Logic
• Manufacturer: Cirrus Logic, Inc.

RAM Access End
CTRLbase+6
RE7-RE0
Global Status
CTRLbase+7, Default = 00000000
ZVA
IMV
WDT
IMPU
IWSS
ISB
ICTRL
CWSS
60
CWSS
RE7
D7
D7
RE6
D6
ICTRL
D6
RE5
D5
A 0 written to this location resets the
previous location, CTRLbase+5,
from data download mode to com-
mand mode.
ZVPORT Active. When set, indicates
that data is being received on the
ZVPORT pins.
Hardware Master Volume Control
Interrupt Status. When set, hard-
ware volume has changed. IMV is
cleared by reading this status regis-
ter. Master Volume Interrupts are
enabled through VCIE in C8.
Watch-Dog Timer. If an error occurs
on the ISA bus, the Processor will
be reset and WDT will be set.
MPU-401 Interrupt status. MPU inter-
rupt pending when set to 1.
Windows Sound System Interrupt
Status. WSS interrupt pending when
set to 1.
Sound Blaster Interrupt status. Sound
Blaster interrupt pending when set to
1.
Control Logical Device 2 Interrupt
status. A context switch interrupt is
pending when set to 1.
Context - WSS. Indicates the current
context.
0 - Sound Blaster Emulation
1 - Windows Sound System
D5
ISB
RE4
D4
IWSS
D4
RE3
D3
IMPU
D3
RE2
D2
WDT IMV
D2
RE1
D1
D1 D0
RE0
D0
ZVA
Control Indirect Registers
The Control Indirect registers are accessed
through CTRLbase+3 and CTRLbase+4.
CTRLbase+3 is the address register and
CTRLbase+4 is the data register used to access
C0 through C9 indirect registers.
Reserved (C0)
Default = xxxxxxxx
rbc
D7
rbc
CTRLbase+3
CTRLbase+4
Index
Address
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
Table 17. Control Indirect Access Registers
CrystalClear Portable ISA Audio System
Table 18. Control Indirect Registers
D6
res
Reserved, backwards compatible.
D5
res
Reserved
Version / Chip ID
3D Space Control
3D Enable
Reserved
Reserved
Reserved
Reserved
Wavetable & Volume Control
Power Management
Control Indirect Address
Control Indirect Data
TM
D4
res
Register Name
Register Name
D3
res
D2
rbc
D1
rbc
CS4239
DS253PP2
D0
rbc