WM8281ECSSLASHR datasheet(69/392 Pages) CIRRUS

69 / 392 page

WM8281

Rev 4.0

The WM8281 performs automatic checks to confirm that the SYSCLK frequency is high enough to

support the output mixer paths. If an attempt is made to enable an output mixer path, and there are

insufficient SYSCLK cycles to support it, then the attempt will be unsuccessful. (Note that any signal

paths that are already active will not be affected under these circumstances.)

The Underclocked Error condition can be monitored using the GPIO and/or Interrupt functions. See

“General Purpose Input / Output” and “Interrupts” for further details.

The status bits in Registers R1600 to R3000 indicate the status of each of the digital mixers. If an

Underclocked Error condition occurs, then these bits provide readback of which mixer(s) have been

successfully enabled.

AIF2TXnMIX_VOL2

AIF2TXnMIX_VOL3

AIF2TXnMIX_VOL4

AIF2TXnMIX_VOL1

AIF2TXnMIX_SRC1

AIF2TXnMIX_SRC3

AIF2TXnMIX_SRC4

AIF2TXnMIX_SRC2

AIF2 TXn

AIF3TXnMIX_VOL2

AIF3TXnMIX_VOL3

AIF3TXnMIX_VOL4

AIF3TXnMIX_VOL1

AIF3TXnMIX_SRC1

AIF3TXnMIX_SRC3

AIF3TXnMIX_SRC4

AIF3TXnMIX_SRC2

AIF3 TXn

WM8281 supports 2 AIF3 Output mixers, ie. n = 1 or 2

AIF1TXnMIX_VOL2

AIF1TXnMIX_VOL3

AIF1TXnMIX_VOL4

AIF1TXnMIX_VOL1

AIF1TXnMIX_SRC1

AIF1TXnMIX_SRC3

AIF1TXnMIX_SRC4

AIF1TXnMIX_SRC2

AIF1 TXn

WM8280 supports 8 AIF1 Output mixers, ie. n = 1, 2, 3, 4, 5, 6, 7 or 8

WM8280 supports 6 AIF2 Output mixers, ie. n = 1, 2, 3, 4, 5 or 6

Figure 25 Digital Core AIF Outputs

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