EMP202 Datasheet, PDF (15/28 Pages) List of Unclassifed Manufacturers – Single-Chip Dual-Channel AC’97 Audio Codec for PC Audio Systems

Single-Chip Dual-Channel AC’97 Audio Codec
EMP202
EMPIA Technology
Bit
15
14
13
12
11
10
9
8
7:4
3
2
1
0
5.1.17. MX26 Powerdown Control/Status
Default: 0000H
This read/write register is used to program powerdown states and monitor subsystem readiness. The
lower half of this register is read only status; a “1” indicating that the subsection is “ready.” Ready is
defined as the subsection’s ability to perform in its nominal state. When this register is written, the bit
values that come in on AC-Link will have no effect on read only bits 0-7 and bit 15.
When the AC-Link “CODEC Ready” indicator bit (SDATA_IN slot 0, bit 15) is a 1, it indicates that the
AC-Link and AC’97 control and status registers are in a fully operational state. The AC’97 controller
must further probe this powerdown control/status register to determine exactly which subsections, if
any are ready.
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
-
R
R
R
R
Function
PR7 External Amplifier Power Down: (EAPD).
0: EAPD output low (enable external amplifier).
1: EAPD output high (shut down external amplifier)
PR6:
0: Normal
1: Power down Headphone
PR5:
0: Normal.
1: Disable internal clock usage (BITCLK still be output for modem CODEC)
PR4:
0: Normal
1: Power down AC-Link
R3:
0: Normal
1: Power down Mixer (VREF off)
PR2:
0: Normal
1: Power down Mixer (VREF on)
PR1:
0: Normal
1: Power down PCM DAC
PR0:
0: Normal
1: Power down PCM ADC and input MUX
Reserved, read as 0
VREF Status:
1: VREF normal level
0: Not yet
Analog Mixer Status:
1: Ready
0: Not yet
DAC Status:
1: Ready
0: Not yet
ADC Status:
1: Ready
0: Not yet
7/15/2002
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