Figure 340. S/Pdif Block Format; Figure 341. S/Pdif Preambles - ST STM32F446 Series Reference Manual

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SPDIF receiver interface (SPDIFRX)

For linear coded audio applications, the first sub-frame (left or "A" channel in stereophonic

operation and primary channel in monophonic operation) normally starts with preamble "M".

However, the preamble changes to preamble "B" once every 192 frames to identify the start

of the block structure used to organize the channel status and user information. The second

sub-frame (right or "B" channel in stereophonic operation and secondary channel in

monophonic operation) always starts with preamble "W".

A S/PDIF block contains 192 pairs of sub-frames of 32 bits.

Figure 340. S/PDIF block format

Synchronization preambles

The preambles patterns are inverted or not according to the previous half-bit value. This

previous half-bit value is the level of the line before enabling a transfer for the first "B"

preamble of the first frame. For the others preambles, this previous half-bit value is the

second half-bit of the parity bit of the previous sub-frame. The preambles patterns B, M and

W are described in the

RM0390 Rev 4

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