Gci Interface - Laird BT800 Series Hardware Integration Manual

BT800-ST Hardware Integration Guide
Version 1.5
Figure 5: Short Frame Sync (Shown with 16-bit Sample)
As with Long Frame Sync, 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.
8.4.4 Multi-Slot Operation
More than 1 SCO connection over the PCM interface is supported using multiple slots. Up to 3 SCO connections are
carried over any of the first 4 slots.
Figure 6: Multi-slot Operation with 2 Slots and 8-bit Companded Samples

8.5 GCI Interface

BT800 is compatible with the GCI, a standard synchronous 2B+D ISDN timing interface. The two 64 kbps B channels
are accessed when this mode is configured.
Figure 7: Multi-slot Operation
The start of frame is indicated by the rising edge of PCM_SYNC and runs at 8 kHz.
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