Philips CDD522 Operating Instructions Manual page 26

Q-data format in Mode 1 (Time/Track)
TNO, X, MIN, SEC, FRAME, ZERO, AMIN, ASEC, AFRAME
8 8 8 8 8 8
fo) co fe]
Track Number, expressed in 2 digits BCD (8 bits).
number of bits
During Lead-In : 00
During Program Area : 01-99
During Lead-Out > AA
Index to TNO, 2 digits BCD (8 bits).
During Lead-In : not available (See Chapter 4)
During Program Area : 01-99
00 during Pause encoding
During Lead-Out :01
8 bits zero
Track Relative Time, each 2 digits BCD (24 bits).
Time is ZERO at end of pause, decreases before
pause and increases after pause.
There are 75 FRAMEs per second.
AFRAME: Disk Absolute Time, each 2 BCD digits.
Time is set to ZERO at the start of the Program
Area.
The Absolute Time or Relative Time is used by the Servo pP during
search actions. This is true for CDDA disks as well as Datadisks.
IMPORTANT REMARK: Some confusion may exist by the use
of the FRAME-term in the Q-data. This FRAME (75 per
second) is actually a Audio Sector (See end of Chapter 2 p 20 :
EFM Structure) and NOT a Audio Frame, containing 24 audio
data bytes.
The remaining channels R through W are free to be used for extra ©
applications. Among possible applications are CD+G (Graphics on
screen, teletext-like) and MIDI.