307013-003 Datasheet, PDF (639/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

AC ’97 Audio Controller Registers (D30:F2) (Desktop and Mobile Only)
16.2.7
x_CR—Control Register (Audio—D30:F2)
I/O Address:
Default Value:
Lockable:
NABMBAR + 0Bh (PICR),
NABMBAR + 1Bh (POCR),
NABMBAR + 2Bh (MCCR)
MBBAR + 4Bh (MC2CR)
MBBAR + 5Bh (PI2CR)
MBBAR + 6Bh (SPCR)
00h
No
Attribute:
Size:
Power Well:
R/W, R/W (special)
8 bits
Core
Software can read the registers at the offsets 08h, 0Ah, and 0Bh by performing a 32-bit
read from the address offset 08h. Software can also read this register individually by
doing a single, 8-bit read to offset 0Bh. Reads across DWord boundaries are not
supported.
Bit
Description
7:5 Reserved.
Interrupt on Completion Enable (IOCE) — R/W. This bit controls whether or not an
interrupt occurs when a buffer completes with the IOC bit set in its descriptor.
4
0 = Disable. Interrupt will not occur.
1 = Enable.
FIFO Error Interrupt Enable (FEIE) — R/W. This bit controls whether the
occurrence of a FIFO error will cause an interrupt or not.
3
0 = Disable. Bit 4 in the Status register will be set, but the interrupt will not occur.
1 = Enable. Interrupt will occur.
Last Valid Buffer Interrupt Enable (LVBIE) — R/W. This bit controls whether the
completion of the last valid buffer will cause an interrupt or not.
2
0 = Disable. Bit 2 in the Status register will still be set, but the interrupt will not occur.
1 = Enable.
Reset Registers (RR) — R/W (special).
0 = Removes reset condition.
1 = Contents of all Bus master related registers to be reset, except the interrupt
1
enable bits (bit 4,3,2 of this register). Software needs to set this bit but need not
clear it since the bit is self clearing. This bit must be set only when the Run/Pause
bit (D30:F2:2Bh, bit 0) is cleared. Setting it when the Run bit is set will cause
undefined consequences.
Run/Pause Bus Master (RPBM) — R/W.
0
0 = Pause bus master operation. This results in all state information being retained
(i.e., master mode operation can be stopped and then resumed).
1 = Run. Bus master operation starts.
Intel ^® ICH7 Family Datasheet
639