Rev. 3.0, 03/01, page 213 of 390
AC97 RX Status Register (ARSR) [cont’d]
Bit
Description
Default
2
Line2 RX FIFO UNDERRUN (L2RFUN):
When this bit is set to 1, it indicates that Line 2 RX FIFO is underrun
0
1
HSET RX FIFO UNDERRUN (HTRFUN):
When this bit is set to 1, it indicates that HSET RX FIFO is underrun
0
0
IO CTRL/STA RX FIFO UNDERRUN (IOCSRFUN):
When this bit is set to 1, it indicates that IO CTRL/STA RX FIFO is underrun
0
14.2.22
AC97 Control Register (ACR)
ACR, a 32-bit Write only register, is used to control AC97 controller. Bits 30-23 are reserved. The
other bits are initialized to 0 at reset. ACR is not initialized at STANDBY mode.
Bit
31
30
29
28
27
26
25
24
Bit Name
VS
-
-
-
-
-
-
-
Initial Value
0
-
-
-
-
-
-
-
R/W
W
-
-
-
-
-
-
-
Bit
23
22
21
20
19
18
17
16
Bit Name
-
RXDMA_
EN
TXDMA_
EN
FCAF
FCDF
FSTAF
FSTDF
FPLTF
Initial Value
-
0
0
0
0
0
0
0
R/W
-
W
W
W
W
W
W
W
Bit
15
14
13
12
11
10
9
8
Bit Name
FPRTF
FL1TF
FPCTF
FPLSTF FPRSTF FPLETF FL2TF
FHTF
Initial Value
0
0
0
0
0
0
0
0
R/W
W
W
W
W
W
W
W
W
Bit
7
6
5
4
3
2
1
0
Bit Name
FIOCTF
FPLRF
FPRRF
FL1RF
FMRF
FL2RF
FHRF
FIOSRF
Initial Value
0
0
0
0
0
0
0
0
R/W
W
W
W
W
W
W
W
W
Summary of Contents for HD64465
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