STAC9758 Datasheet, PDF (101/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
Bit(s) Reset Value R/W Name
Description
0 = Anti Pop Enabled
1 = Anti Pop Disabled
The STAC9758/9759 includes an internal power supply anti-pop circuit
that prevents audible clicks and pops from being heard when the CODEC
is powered on and off. This function is accomplished by delaying the
charge/discharge of the VREF capacitor (Pin 27). C_VREF value of 1 µF will
7
0
RW INT_APOP cause a turn-on delay of roughly 3 seconds, which will allow the power
supplies to stabilize before the CODEC outputs are enabled. The delay
will be extended to 30 seconds if a value of C_VREF value of 10 µF is used.
The CODEC outputs are also kept stable for the same amount of time at
power-off to allow the system to be gracefully turned off. The INT_APOP
bit allows this delay circuit to be bypassed for rapid production testing. Any
external component anti-pop circuit is unaffected by the internal circuit.
Allows separate mute control bits for Master, Headphone, LineIN, CD,
AUX and PCM
volume control registers as well as Record Gain register.
0 = Default Value: Left and Right channel mutes are controlled by bit D15
of the respective registers disables writes to all R mute signals and force
6
0
RW SPLITMUTE them to read 0.
1 = Bit D15 of respective register affects only the Left channel Mute and bit
D7 affects only the Right Channel Mute enables read and writes to Rmute
bit in all Stereo Volume registers.
If SPLITMUTE is not set, the bahavior is the same as previous CODECs.
SPDIF_IN FIFO OVERRUN STATUS BIT
5
0
RW SIFOVRN 0 = no overrun occurred (defualt)
1 = overrun has occurred
SPDIF_IN PARITY ERROR
4
0
RW SIPER 0 = no parity error occurred (defualt)
1 = parity error occurred
Digital PLL Lock
3
0
RO DPLL_LOCK 0 = DPLL not locked
1 = DPLL locked to SPDIF _IN and data valid
SPDIF Running
2
0
RO SP_RUN 0 = no signal on pin 47
1 = signal on pin 47
Powerdown bit for first DAC
1 = powerdown
1
0
RW PR_DAC_A 0 = normal operation
This is equivalent to PRI, PRJ, and PRK, but applies to the first DAC which
is not otherwise accomodated
Stereo Mic Enable
0
0
RW
STMICEN
0 = Mono
1 = Stereo
If this bit is 1, then Reg 20h, D8, causes left/right swap when set to 1.
IDT™
101
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
V 1.2 1206