User's Manual

BT830 Hardware Integration Guide
Version 0.1 (PRELIMINARY)
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CONN-GUIDE-BT830
(PRELIMINARY)
8.4.1 PCM Interface Master/Slave
When configured as the master of the PCM interface, the BT830 generates PCM_CLK and PCM_SYNC.
Figure 2: PCM Interface Master
Figure 3: PCM Interface Slave
8.4.2 L ong 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 the BT830 is configured
as PCM master, generating PCM_SYNC and PCM_CLK, then PCM_SYNC is eight bits long. When the BT830 is
configured as PCM Slave, PCM_SYNC is from one cycle PCM_CLK to half the PCM_SYNC rate.
BT830 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.