CDROM Digital Signals

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Hi,

Got a Panasonic CDROM (CR-588-B) manufactured in 1998 with a Sanyo chip model LC895199. The PCB has traces with test pads marked DBCK, BLKCK (I think it should be DLRCK because I can't find BLKCK in the datasheet) and DSData. These pads are next to each other

The spec sheet for the Sanyo chip specifies DBCK, DLRCK and DSDATA as output signals to the DAC

Would these be I2S signals?

Currently I have one of those CDROM controller kits controlling the CDROM and I'm using the spdif digital out.

Thanks in advance for any info
 
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