92HD65C Datasheet, PDF (21/268 Pages) Integrated Device Technology – SIX CHANNEL HD AUDIO CODECS

92HD65C
SIX CHANNEL HD AUDIO CODEC WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
2.18. EAPD
[13:11]
[10:8]
[6:4]
[3:0]
[7:4]
[3:0]
SmplRateMultp
SmplRateDiv
BitsPerSmpl
NmbrChan
Strm
Ch
Sample Base Rate Multiple
000=48kHz/44.1kHz or less
001= x2
010= x3 (not supported)
011= x4 192kHz only, 176.4 not supported
100-111= Reserved
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 10: Mult-channel
The EAPD pin 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 sig-
nal. 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 pin defaults to an
open-drain configuration (an external pull-up is recommended.)
Per the HD Audio specification and HDA015-B, multiple ports may control EAPD. The EAPD pin
assumes the highest power state of all 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.
IDT CONFIDENTIAL
21
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.91 10/11
92HD65C