82801BA Datasheet, PDF (419/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

AC’97 Modem Controller Registers (D31:F6)
14.2.2
14.2.3
x_CIV—Current Index Value Register
I/O Address:
Default Value:
Lockable:
MBAR + 04h (MICIV),
MBAR + 14h (MOCIV),
00h
No
Attribute:
Size:
Power Well:
RO
8bits
Core
Bit
Description
7:5 Hardwired to 0.
Current Index Value [4:0]—RO. These bits represent which buffer descriptor within the list of 16
4:0 descriptors is being processed currently. As each descriptor is processed, this value is
incremented.
x_LVI—Last Valid Index Register
I/O Address:
Default Value:
MBAR + 05h (MILVI),
MBAR + 15h (MOLVI)
00h
Attribute:
Power Well:
R/W
Core
Bit
Description
7:5 Hardwired to 0
4:0
Last Valid Index [4:0]—R/W. These bits indicate the last valid descriptor in the list. This value is
updated by software as it prepares new buffers and adds to the list.
82801BA ICH2 and 82801BAM ICH2-M Datasheet
14-9