Gci Interface; Slots And Sample Formats - Laird BT800 series Hardware Integration Manual

BT800 Hardware Integration Guide
Version 0.2
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.
9.4.4 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
9.5

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 8kHz.
9.6

Slots and Sample Formats

BT800 receives and transmits on any selection of the first 4 slots following each sync pulse. Slot durations
are either 8 or 16 clock cycles:
8 clock cycles for 8-bit sample formats.

16 clock cycles for 8-bit, 13-bit or 16-bit sample formats.

BT800 supports:
Americas: +1-800-492-2320 Option 2
Europe: +44-1628-858-940
Hong Kong: +852-2923-0610
www.lairdtech.com/bluetooth
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