CS4237B Datasheet, PDF (64/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
Control/RAM Access
CTRLbase+5, Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
CR7 CR6 CR5 CR4 CR3 CR2 CR1 CR0
CR7-CR0
This register controls the loading of
the part’s internal RAM. RAM sup-
port includes hardware configuration
and PnP default resource data, as
well as program memory. See the
Hostload Procedure section for more
information. Commands are followed
by address and data information.
Commands: 0x55 - Disable PnP Key
0x56 - Disable Crystal Key
0x57 - Jump to ROM
0x5A - Update Hardware Configura-
tion Data.
0xAA - Download RAM. Address
followed by data. (Stopped by writ-
ing 0 to CTRLbase+6)
RAM Access End
CTRLbase+6, Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
RE7 RE6 RE5 RE4 RE3 RE2 RE1 RE0
RE7-RE0
A 0 written to this location resets the
previous location, CTRLbase+5,
from data download mode to com-
mand mode.
Global Status
CTRLbase+7, Default = xxxxxxxx
D7 D6 D5 D4 D3 D2 D1 D0
CWSS ICTRL ISB IWSS IMPU res res res
res
Reserved. Could read as 0 or 1.
IMPU
IWSS
MPU-401 Interrupt status.
0 - no interrupt pending
1 - an interrupt is pending
Windows Sound System Interrupt
status.
0 - no interrupt pending
1 - an interrupt is pending
ISB
Sound Blaster Interrupt status.
0 - no interrupt pending
1 - an interrupt is pending
ICTRL
CWSS
Control Logical Device 2 Interrupt
status. Interrupts are generated on
a context switch between WSS and
SBPro modes.
0 - no interrupt pending
1 - an interrupt is pending
Context - WSS. Indicates the current
context.
0 - Sound Blaster Emulation
1 - Windows Sound System
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