92HD99B Datasheet, PDF (211/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Register Address
verb F8D/78D
Bit
Label
7:0 LATKTH[7:0]
Type Default
Description
RW FF
Always 0. It isn’t necessary to provide threshold resolution to
the point where these lower 8 bits would be used.
Register Address
verb F8E/78E
Bit
Label
7:0 LRELTH[15:8]
Type Default
Description
RW 0
8’hFF would equal threshold level of +2.0dB. Each step below
this 8-bit full scale value reduces threshold level by 0.0078 dB.
Register Address
verb F8F/78F
Bit
Label
7:0 LRELTH[7:0]
Type Default
Description
RW 0
Always 0. It isn’t necessary to provide threshold resolution to
the point where these lower 8 bits would be used.
7.29.1.15. GAINCTRL_HI Register
Prior to WC revision, this register reset by POR/DAFG/ULR. WC revision, reset by POR only. Writing
to NID22h verb 77F will cause reset on all silicon revisions.
Register Address
Bit
Label
7:5 Reserved
verb F90/790
4:3 zerodetlen
2:0 step_time
Type Default
Description
RO 0
RESERVED
RW 0x2
enable mute if input consecutive zeros exceeds this length:
00 = 32
01 = 1000
10 = 2000
11 = 4000
RW 0x5
step time units = 1<<step_time, units in GAINCTRL_LO bit 5
7.29.1.16. GAINCTRL_LO Register
Prior to WC revision, this register reset by POR/DAFG/ULR. WC revision, reset by POR only. Writing
to NID22h verb 77F will cause reset on all silicon revisions.
Register Address
verb F91/791
Bit
Label
Type Default
Description
7
clr_latch
RW 0
1 = clear limit 0/1 latches, see STATUS register
6
RSVD
RO 0
Reserved
5
step_10ms
RW 0
1 = units for step_time are 10ms
0 = units for step_time are 1ms
4
stepped_change RW 0
1 = step volume progressively to new setting
3
disable_gain
RW 0
1 = disable all gain functions (bypass gain multiply)
2
auto_mute
RW 1
1 = auto mute if detect long strings of zeros on input
1
change_mode RW 0
1 = change gain immediately
0 = change on zero cross
0
mute_mode
RW 1
1 = hard mute after reset, 0 = soft mute
IDT CONFIDENTIAL
211
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD99