Specifications

64 SAM0025A-062397 ESS Technology, Inc.
ES1879 DATA SHEET
REGISTERS
PRELIMINARY
a
.
Sound Blaster filter control bits F2, F1, and F0 have
no function in the ES1879 and are ignored.
Register Detailed Descriptions
Reset Mixer (00h, R/W)
A write to this register resets the mixer registers to their
default values.
Audio 1 Playback Volume (14h, R/W)
This register controls the playback volume of the first
audio channel. On reset, this register assumes the value
of 88h.
Mic Mix Volume (1Ah, R/W)
This register controls the playback volume of the Mic input.
On reset, this register assumes the value of 00h.
65h
0
Opamp
calibration
Opamp calibration control
66h
Write: Reset hardware volume interrupt request Hardware volume interrupt request
67h
ES978 mix volume 0
ES978 mix
into playback
ES978 record
mixer track-
ing mode
select
Interface mode select ES978 interface mode control
68h
Mic mix volume left Mic mix volume right Mic record volume
69h
Audio 2 volume left Audio 2 volume right Audio 2 record volume
6Ah
CD (AuxA) volume left CD (AuxA) volume right CD (AuxA) record volume
6Bh
Music DAC volume left Music DAC volume right Music DAC record volume
6Ch
AuxB volume left AuxB volume right AuxB record volume
6Dh
I
2
S volume left I
2
S volume right I
2
S volume
6Eh
Line volume left Line volume right Line record volume
6Fh
I
2
S volume left I
2
S volume right I
2
S record volume
70h
Clock source Sample rate generator Audio 2 sample rate generator
71h
0I
2
S enable
Controller
register A1h
mode select
Audio 2 over-
sampling
enable
Audio 2 SCF
bypass
enable
Audio 1 SCF
bypass
enable
Asynchro-
nous mode
enable
FM mix
enable
Audio 2 mode
72h
Filter clock divider Audio 2 filter clock divider
74h
2’s complement transfer count – low byte
Audio 2 transfer count reload
76h
2’s complement transfer count – high byte
78h
DMA transfer type 0
Auto-Initial-
ize enable
0
Enable trans-
fer into FIFO
Enable trans-
fer to DAC
Audio 2 control 1
7Ah
IRQ latch IRQ mask 0
FIFO signed
mode
FIFO stereo
mode
FIFO 16-bit
mode
Audio 2 control 2
7Ch
Audio 2 volume left Audio 2 volume right Audio 2 playback volume
7Dh
0
Mic preamp
enable
FDXO source select
FDXI mix
enable
Audio 2 configuration
7Eh
ADC test
enable
Test bus enable
MIDI loop-
back test
FM test
enable
DSP loop-
back test
2nd DMA test
enable
0 Test register
Table 25 ESS Mixer Register Summary (Continued)
RegD7D6D5D4D3D2D1D0Remark
Write: Reset mixer
76543210
Audio 1 play volume left Audio 1 play volume right
76543210
Mic mix volume left Mic mix volume right
76543210