Specifications

ESS Technology, Inc. SAM0025A-062397 65
ES1879 DATA SHEET
REGISTERS
PRELIMINARY
Record Source Select (1Ch, W)
On reset, this register assumes the value of 00h.
Bits Definitions:
a.The master volume inputs are the outputs of the
Spatializer processor, before master volume is
applied.
Stereo Flag (1Eh, R/W)
On reset, this register assumes the value of 00h.
Bits Definitions:
Master Volume (32h, R/W)
On reset, this register assumes the value of 88h.
This register provides backward-compatible access to
master volume. New applications can also use registers
60h and 62h, which have more resolution.
Music DAC Volume (36h, R/W)
This register controls the playback volume of the music
DAC. On reset, this register assumes the value of 88h.
CD (AuxA) Volume (38h, R/W)
This register controls the playback volume of the CD audio
input. On reset, this register assumes the value of 00h.
AuxB Volume (3Ah, R/W)
This register controls the playback volume of the auxiliary
line input. On reset, this register assumes the value of 00h.
x x F1 x F0 Record Source
76543210
Bits Name Description
7:6 – No function.
5 F1 Sound Blaster Pro filter control bit. Has no
function in the ES1879 and is ignored.
4 – No function.
3 F0 Sound Blaster Pro filter control bit. Has no
function in the ES1879 and is ignored.
2:0 Record
Source
For extended access, use register address
1Ch to select recording from the mixer as fol-
lows:
bit 2
bit 1 bit 0 record source selected
0 0 0 Microphone (default).
0 0 1 Left channel: mic (not mixed
with ES978 mic).
Right channel: master
volume inputs
a
(left + right).
0 1 0 CD (AuxA) input.
0 1 1 Left channel: AOUTL
Right channel: AOUTR.
1 0 0 Microphone.
1 0 1 Record mixer.
1 1 0 Line input.
1 1 1 Master volume inputs.
a
xx F2x x x
Stereo
flag
x
76543210
Bits Name Description
7:6 – No function.
5 F2 Sound Blaster Pro filter control bit. Has no
function in the ES1879 and is ignored.
4:2 – No function.
1Stereo
Flag
1 = Enable Sound Blaster Pro-compatible ste-
reo DAC functions.
0 = Disable Sound Blaster Pro-compatible ste-
reo DAC functions.
0 – No function.
Master volume left Master volume right
76543210
Music DAC volume left Music DAC volume right
76543210
CD (AuxA) volume left CD (AuxA) volume right
76543210
AuxB volume left AuxB volume right
76543210