CS4201 Datasheet, PDF (44/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
7. EXCLUSIVE FUNCTIONS
Some of the digital pins on the CS4201 have mul-
tiplexed functionality. These functions are mutual-
ly exclusive and cannot be requested at the same
time. The following pairs of functions are mutually
exclusive:
• GPIO and Serial Data Port (GPIO0 pin is
shared with LRCLK pin and GPIO1 pin is
shared with SDOUT pin)
• EAPD and Serial Data Port Serial Clock
(EAPD pin is shared with SCLK pin)
• S/PDIF and Second Serial Data Port (SPDO pin
is shared with SDO2 pin)
There is no priority assigned to the exclusive func-
tions. A function currently in use must be disabled
or powered down before the corresponding exclu-
sive function can be enabled. The following control
bits for these functions will behave differently than
normal bits: the EAPD bit in the Powerdown Con-
trol/Status Register (Index 26h), the PRA bit in the
Extended Modem Status/Control Register (Index
3Eh), the SPEN bit in the S/PDIF Control Register
(Index 68h), and the SDEN, SDO2, and SDSC bits
in the Serial Port Control Register (Index 6Ah).
These bits can become read-only bits if they control
a feature that is currently unavailable because the
corresponding exclusive feature is already in use,
or the corresponding master control for this feature
is not set.
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