BT800 Hardware Integration Guide
Version 0.2
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CONN-GUIDE-BT800_v0_2
Figure 3: PCM Interface Slave
9.4.2
Long Frame Sync
Figure 4: Long Frame Sync (Shown with 8-bit Companded Sample)
Long Frame Sync is the name given to a clocking format that controls the transfer of PCM data words or
samples. In Long Frame Sync, the rising edge of PCM_SYNC indicates the start of the PCM word. When
BT800 is configured as PCM master, generating PCM_SYNC and PCM_CLK, then PCM_SYNC is 8 bits long.
When BT800 is configured as PCM Slave, PCM_SYNC is from 1 cycle PCM_CLK to half the PCM_SYNC
rate.
BT800 samples PCM_IN on the falling edge of PCM_CLK and transmits PCM_OUT on the rising edge.
PCM_OUT is configurable as high impedance on the falling edge of PCM_CLK in the LSB position or on
the rising edge.
9.4.3
Short Frame Sync
In Short Frame Sync, the falling edge of PCM_SYNC indicates the start of the PCM word. PCM_SYNC is
always 1 clock cycle long.
Figure 5: Short Frame Sync (Shown with 16-bit Sample)
