Specifications

ESS Technology, Inc. SAM0023-122898 63
ES1869 DATA SHEET
REGISTERS
Opamp Calibration Control (65h, R/W)
In the analog circuitry of the ES1869, operational
amplifiers that require calibration go through a calibration
procedure that takes about 200 milliseconds to perform.
During this period the analog outputs of the chip (AOUT_L,
AOUT_R, and MONO_OUT) are muted.
The calibration procedure occurs automatically after
hardware reset and can be started at any time thereafter
by writing 1 to mixer register 65h.
Bit Definitions:
Clear Hardware Volume Interrupt Request (66h, R/W)
Any write to this register resets the hardware volume
interrupt request.
Mic Record Volume (68h, R/W)
This register controls the record volume for the mic input.
Set low by hardware reset but not by mixer reset.
Audio 2 Record Volume (69h, R/W)
This register controls the record volume for the second
audio channel input. Set low by hardware reset but not by
mixer reset.
AuxA (CD) Record Volume (6Ah, R/W)
This register controls the record volume for the CD input.
Set low by hardware reset but not by mixer reset.
Music DAC Record Volume (6Bh, R/W)
This register controls the record volume for the music DAC
input (FM or wavetable). Set low by hardware reset but not
by mixer reset.
AuxB Record Volume (6Ch, R/W)
This register controls the record volume for the auxiliary
line input. Set low by hardware reset but not by mixer
reset.
Mono_In Play Mix (6Dh, R/W)
This register controls the playback volume for the mono
input.
3:2 Mode Selects operating mode.
1 HMV int
mask
This bit is AND'ed with the hardware volume
interrupt request before being OR'd with the first
channel audio interrupt request. If this bit is low,
the hardware volume interrupt request does not
get OR'd with the first channel audio interrupt
request. This bit is cleared by hardware reset.
0 Disable
SB Pro
master
vol
emula-
tion
When low, a write to Sound Blaster Pro master
volume registers 22h or 32h is translated into a
write to hardware master volume registers 60h
and 62h. Also, if low, a mixer reset (writing to
mixer register 0h) causes registers 60h and 62h
to be reset to default value 36h.
When high, the Sound Blaster Pro master volume
registers are, in effect, read-only.
This bit is cleared by hardware reset.
Opamp calibration
7 6 5 4 3 2 1 0
Bits Name Description
0 Opamp
calibration
Read: 1 = Opamp calibration is in progress.
The calibration operation happens after hard-
ware reset if a 1 is written to this bit. Calibration
takes about 200 msec, during which the analog
outputs of the chip (AOUT_L/R, MONO_OUT)
are muted.
Write: A 1 written to this register starts a cali-
bration operation. A zero written to this register
stops the calibration operation immediately
(not recommended).
Bits Name Description
Bit 3 Bit 2 Operating mode
0 0 Normal 3-wire mode (HW reset
default
0 1 2-wire mode: Up/Down inputs
simulatneously low equal Mute
input low.
1 0 Reduced debounce (10 µsec vs.
40 msec), 2-wire mode, auto-
increment/decrement disabled
1 1 HW volume control disabled
Clear Hardware Master Control
7 6 5 4 3 2 1 0
Left Mic record Right Mic record
7 6 5 4 3 2 1 0
Left Audio 2 record Right Audio 2 record
7 6 5 4 3 2 1 0
Left AuxA (CD) record Right AuxA (CD) record
7 6 5 4 3 2 1 0
Left music DAC record Right music DAC record
7 6 5 4 3 2 1 0
Left AuxB record Right AuxB record
7 6 5 4 3 2 1 0
Left Mono_In play mix Right Mono_In play mix
7 6 5 4 3 2 1 0