User's Manual

BT830 Hardware Integration Guide
Version 0.1 (PRELIMINARY)
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15
CONN-GUIDE-BT830
(PRELIMINARY)
8.5 GCI Interface
BT830 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.
8.6 Slots and Sample Formats
BT830 receives and transmits on any selection of the first four 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.
BT830 supports:
 13-bit linear, 16-bit linear and 8-bit µ-law or A-law sample formats
 A sample rate of 8 ksps
 Little or big endian bit order
 For 16-bit slots, the three or eight unused bits in each slot are filled with sign extension, padded with zeros or a
programmable 3-bit audio attenuation compatible with some codecs.