ST STM32F446 Series Reference Manual page 928

SPDIF receiver interface (SPDIFRX)
Bits 28:16 TLO[12:0]: Threshold LOW (TLO = 1.5 x UI / T
This field contains the current threshold LOW estimation. This value can be used to estimate the
sampling rate of the received stream. The accuracy of TLO is limited to a period of the
SPDIFRX_CLK. The sampling rate can be estimated as follow:
Sampling Rate = [2 x TLO x T
Note that TLO is updated by the hardware when SYNCD goes high, and then every frame.
Bits 15:13 Reserved, must be kept at reset value.
Bits 12:0 THI[12:0]: Threshold HIGH (THI = 2.5 x UI / T
This field contains the current threshold HIGH estimation. This value can be used to estimate the
sampling rate of the received stream. The accuracy of THI is limited to a period of the
SPDIFRX_CLK. The sampling rate can be estimated as follow:
Sampling Rate = [2 x THI x T
Note that THI is updated by the hardware when SYNCD goes high, and then every frame.
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SPDIFRX_CLK
+/- T
SPDIFRX_CLK SPDIFRX_CLK
SPDIFRX_CLK
+/- T
SPDIFRX_CLK SPDIFRX_CLK
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] x 2/3
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] x 2/5
RM0390