cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 64

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

Control/RAM Access
CTRLbase+5, Default = xxxxxxxx
CR7-CR0
Commands:
RAM Access End
CTRLbase+6, Default = xxxxxxxx
RE7-RE0
64
CR7
RE7
D7
D7
CR6
RE6
D6
D6
CR5
RE5
D5
D5
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.
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)
A 0 written to this location resets the
previous location, CTRLbase+5,
from data download mode to com-
mand mode.
CR4
RE4
D4
D4
CR3
RE3
D3
D3
CR2
RE2
D2
D2
CR1
RE1
D1
D1
CR0
RE0
D0
D0
Global Status
CTRLbase+7, Default = xxxxxxxx
res
IMPU
IWSS
ISB
ICTRL
CWSS
CWSS
D7
ICTRL
D6
Reserved. Could read as 0 or 1.
0 - no interrupt pending
1 - an interrupt is pending
status.
0 - no interrupt pending
1 - an interrupt is pending
Sound Blaster Interrupt status.
0 - no interrupt pending
1 - an interrupt is pending
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.
0 - Sound Blaster Emulation
1 - Windows Sound System
MPU-401 Interrupt status.
Windows Sound System Interrupt
Context - WSS. Indicates the current
D5
ISB
IWSS
D4
IMPU
D3
D2
res
CS4237B
DS213PP4
D1
res
D0
res