Specifications

ESS Technology, Inc. SAM0025A-062397 77
ES1879 DATA SHEET
REGISTERS
PRELIMINARY
Audio 2 Control 2 (7Ah, R/W)
This register is reset to zero by hardware or software reset.
Bits Definitions:
Audio 2 Playback Volume (7Ch, R/W)
This register controls the playback volume for the second
audio channel. This register is reset to zero by hardware
reset.
Audio 2 Configuration (7Dh, R/W)
This register is reset to 08h by hardware reset.
Bits Definitions:
IRQ
latch
IRQ mask 0
FIFO
signed
mode
FIFO
stereo
mode
FIFO
16-bit
mode
7 6 5432 1 0
Bits Name Description
7 IRQ latch Audio 2 Interrupt Request Latch. This latch is
set high when the DMA counter rolls over to 0
or when a 1 is written to this bit. The latch is
cleared by writing a 0 to this bit or by hardware
or software reset.
6IRQ
mask
This bit is AND’d with bit 7 to produce the
audio 2 interrupt request.
5:3 – Reserved. Always write 0.
2 FIFO
signed
mode
1 = Audio 2 FIFO 2's complement mode.
0 = Audio 2 FIFO unsigned (offset 8000).
1 FIFO
stereo
mode
1 = Audio 2 FIFO stereo mode.
0 = Mono data.
0 FIFO
16-bit
mode
1 = Audio 2 FIFO 16-bit mode.
0 = Audio 2 FIFO 8-bit mode.
Audio 2 volume left Audio 2 volume right
76543210
0
Mic
preamp
enable
FDXO source select
FDXI mix
enable
76 5 4 3 2 1 0
Bits Name Description
7:4 – Reserved. Always write 0.
3Mic
preamp
enable
1 = Enable +26 dB microphone preamp gain.
0 = Microphone preamp is 0 dB.
2:1 FDXO
source
select
Selects the FDXO source:
bit 2
bit 1 source
0 0 Mute (CMR).
0 1 CINR pin (audio 1 DAC, right
channel playback, after filter
stage).
1 0 Audio 2 DAC, right channel out-
put.
1 1 Mono mix of left and right record
level stage outputs. FDXO is
controlled by record source
select (0Ch/1Ch) and record
level (B4h) registers.
0FDXI mix
enable
1 = FDXI is mixed with AOUTL and AOUTR
after the playback mixer, Spatializer audio pro-
cessor, and master volume stages. Mix is unity
gain (no gain).
0 = FDXI is not mixed with AOUTL and
AOUTR.