YM3414 digital filter: data needed

[Dirk-Jan]

Hello,

One of my current projects is converting a CD-player DAC to receive S/PDIF
signals.
Data has to be fed first into a YM3414 digital filter, which differs
slightly from the YM3433,
on which info can be found on the internet.

Does anyone know where to find the datasheet of the YM3414 itself?

Thanks in advance,

DJ