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Programmer’s Reference Manual 107
AC ’97 Modem Controller Registers (D30:F3)
3.2.10 CAS—Codec Access Semaphore Register
(Modem—D30:F3)
I/O Address: NABMBAR + 44h Attribute: R/W (special)
Default Value: 00h Size: 8 bits
Lockable: No Power Well: Core
Note: Reads across DWord boundaries are not supported.
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Bit Description
7:1 Reserved
0
Codec Access Semaphore (CAS) — R/W (special). This bit is read by software to check whether a
codec access is currently in progress.
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.