92HD91 Datasheet, PDF (23/298 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD91
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
[10:8]
[6:4]
[3:0]
[7:4]
[3:0]
SmplRateDiv
BitsPerSmpl
NmbrChan
Strm
Ch
Sample Base Rate Divisor
000= Divide by 1
001= Divide by 2 (not supported)
010= Divide by 3 (not supported)
011= Divide by 4 (not supported)
100= Divide by 5 (not supported)
101= Divide by 6 (not supported)
110= Divide by 7 (not supported)
111= Divide by 8 (not supported)
Bits per Sample
000= 8 bits (not supported)
001= 16 bits
010= 20 bits
011= 24 bits
100-111= Reserved
Number of Channels
Number of channels for this stream in each “sample
block” of the “packets” in each “frame” on the link.
0000=1 channel (not supported)
0001 = 2 channels
…
1111= 16 channels.
Software-programmable integer representing link
stream ID used by the converter widget. By conven-
tion stream 0 is reserved as unused.
Integer representing lowest channel used by con-
verter.
0 and 2 are valid Entries
If assigned to the same stream, one ADC must be
assigned a value of 0 and the other ADC assigned a
value of 2.
Table 8: Mult-channel
2.14. EAPD
The EAPD pin (pin 47) is a dedicated, bi-directional control pin. Although named External Amplifier
Power Down (EAPD) by the HD Audio specification, this pin operates as an external amplifier power
up signal. The EAPD value is reflected on the EAPD pin; a 1 causes the external amplifier to power
up (equivalent to D0), and a 0 causes it to power down (equivalent to D3.) When the EAPD value =
1, the EAPD pin must be placed in a state appropriate to the current power state of the associated
Pin Widget even though the EAPD value (in the register) may remain 1. The default state of this pin
is 0 (driving low.) The pin defaults to an open-drain configuration (an external pull-up is recom-
mended.)
Per the HD Audio specification and HDA015-B, multiple ports may control EAPD. The EAPD pin
assumes the highest power state of all the the EAPD bits in all of the pin complexes. The default
value of EAPD is 1 (powered on), but the FG power state will override and the pin will be low. A port
will request External Amp Power Up when its power state is active (FG and pin widget power state is
D1 or D0) or (Analog PC_Beep is enabled and port is enabled as an output) and the port’s EAPD bit
is set to 1. The state of the EAPD pin (unless configured as an input or held low by an external circuit
when configured as an open drain output) will be the logical OR of the external amp power up
requests from all ports.
IDT™ CONFIDENTIAL
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92HD91