* D7: consumer serial port enable (CS4237B,CS4238B)
* D6: channels status block reset (CS4237B,CS4238B)
* D5: user bit in sub-frame of digital audio data (CS4237B,CS4238B)
- * D4: validity bit bit in sub-frame of digital audio data (CS4237B,CS4238B)
+ * D4: validity bit in sub-frame of digital audio data (CS4237B,CS4238B)
*
* C5 lower channel status (digital serial data description) (CS4237B,CS4238B)
* D7-D6: first two bits of category code