WM8904
Pre-Production
INITIALISATION
When the DRC is initialised, the gain is set to the level determined by the DRC_STARTUP_GAIN
register field. The default setting is 0dB, but values from -3dB to +6dB are available, as described in
Table 22.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R40 (28h)
DRC_STARTUP_
GAIN [4:0]
Initial gain at DRC start-up
00000 = -3dB
10:6
00110
DRC Control 0
00001 = -2.5dB
00010 = -2dB
00011 = -1.5dB
00100 = -1dB
00101 = -0.5dB
00110 = 0dB (default)
00111 = 0.5dB
01000 = 1dB
01001 = 1.5dB
01010 = 2dB
01011 = 2.5dB
01100 = 3dB
01101 = 3.5dB
01110 = 4dB
01111 = 4.5dB
10000 = 5dB
10001 = 5.5dB
10010 = 6dB
10011 to 11111 = Reserved
Table 22 DRC Initialisation
PP, Rev 3.3, September 2012
58
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
