User's Manual

BT860
Datasheet
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8.3.2. Frame Synchronization
The BT860 supports both short- and long-frame synchronization in both master and slave modes. In short-frame
synchronization mode, the frame synchronization signal uses an active-high pulse at the audio frame rate that is
a single-bit period in width and is synchronized to the rising edge of the bit clock. The PCM slave looks for a high
on the falling edge of the bit clock and expects the first bit of the first slot to start at the next rising edge of the
clock.
Figure 3 and Table 11 shows PCM Timing Diagram and Specifications for the master mode of short-frame.
Figure 3: PCM timing diagram (Short-Frame Sync, Master Mode)
Table 11: PCM Interface timing specifications (Short-Frame Sync, Master Mode)
Reference Characteristics Min. Typ. Max. Unit
1
PCM bit clock frequency
- - 12 MHz
2
PCM bit clock LOW
41 - - ns
3
PCM bit clock HIGH
41 - - ns
4
PCM_SYNC setup
0 - 25 ns
5
PCM_OUT delay
0 - 25 ns
6 PCM_IN setup 8 - - ns
7
PCM_IN hold
8 - - ns
8
Delay from rising edge of PCM_BCLK during last
bit period to PCM_OUT becoming high
impedance
0 - 25 ns