TAS5727
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SLOS670 –NOVEMBER 2010
ERROR STATUS REGISTER (0x02)
The error bits are sticky and are not cleared by the hardware. This means that the software must clear the
register (write zeroes) and then read them to determine if they are persistent errors.
Error definitions:
•
•
•
•
MCLK error: MCLK frequency is changing. The number of MCLKs per LRCLK is changing.
SCLK error: The number of SCLKs per LRCLK is changing.
LRCLK error: LRCLK frequency is changing.
Frame slip: LRCLK phase is drifting with respect to internal frame sync.
Table 7. Error Status Register (0x02)
D7
1
D6
-
D5
–
D4
–
D3
–
D2
–
D1
–
D0
–
FUNCTION
MCLK error
–
1
–
–
–
–
–
0
0
–
–
–
–
–
–
PLL autolock error
SCLK error
–
1
–
–
–
–
–
–
–
1
–
–
–
–
LRCLK error
Frame slip
–
–
–
1
–
–
–
–
–
–
–
1
–
–
Clip indicator
–
–
–
–
–
1
–
Overcurrent, overtemperature, overvoltage, or undervoltage error
Reserved
0
0
0
0
0
0
0
(1)
0
0
0
0
0
0
0
No errors
(1) Default values are in bold.
SYSTEM CONTROL REGISTER 1 (0x03)
System control register 1 has several functions:
Bit D7:
Bit D5:
If 0, the dc-blocking filter for each channel is disabled.
If 1, the dc-blocking filter (–3 dB cutoff <1 Hz) for each channel is enabled.
If 0, use soft unmute on recovery from a clock error. This is a slow recovery. Unmute takes the
same time as the volume ramp defined in register 0x0E.
If 1, use hard unmute on recovery from clock error. This is a fast recovery, a single-step volume
ramp.
Bits D1–D0: Select de-emphasis
Table 8. System Control Register 1 (0x03)
D7
0
1
–
–
–
–
–
–
–
–
–
–
D6
–
–
0
–
–
–
–
–
–
–
–
–
D5
–
–
–
0
1
–
–
–
–
–
–
–
D4
–
–
–
–
–
1
–
–
–
–
–
–
D3
–
–
–
–
–
–
0
–
–
–
–
–
D2
–
–
–
–
–
–
–
0
–
–
–
–
D1
–
–
–
–
–
–
–
–
0
0
1
1
D0
–
–
–
–
–
–
–
–
0
1
0
1
FUNCTION
PWM high-pass (dc blocking) disabled
(1)
PWM high-pass (dc blocking) enabled
Reserved(1)
Soft unmute on recovery from clock error(1)
Hard unmute on recovery from clock error
Reserved(1)
Reserved(1)
Reserved(1)
No de-emphasis(1)
De-emphasis for fS = 32 kHz
De-emphasis for fS = 44.1 kHz
De-emphasis for fS = 48 kHz
(1) Default values are in bold.
Copyright © 2010, Texas Instruments Incorporated
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