82801FB Datasheet, PDF (625/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

AC ’97 Modem Controller Registers (D30:F3)
17.2.10
CAS—Codec Access Semaphore Register
(Modem—D30:F3)
I/O Address:
Default Value:
Lockable:
NABMBAR + 44h
00h
No
Attribute:
Size:
Power Well:
R/W (special)
8 bits
Core
Bit
Description
7:1 Reserved
Codec Access Semaphore (CAS) — R/W (special). This bit is read by software to check whether a
codec access is currently in progress.
0 _{0 = No access in progress.}
1 = The act of reading this register sets this bit to 1. The driver that read this bit can then perform
an I/O access. Once the access is completed, hardware automatically clears this bit.
Note: Reads across DWord boundaries are not supported.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
625