Pcm Interface - Laird BT800 series Hardware Integration Manual

BT800 Hardware Integration Guide
Version 0.2
Resume, detach and wake PIOs
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Battery charging from USB: dead battery provision, charge currents, charging in suspend modes
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and USB
VBUS voltage consideration
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USB termination when interface is not in use
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internal modules, certification and non-specification compliant operation
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9.4

PCM Interface

The audio PCM interface on the BT800 supports:
Continuous transmission and reception of PCM encoded audio data over Bluetooth.
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Processor overhead reduction through hardware support for continual transmission and reception
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of PCM data.
A bidirectional digital audio interface that routes directly into the baseband layer of the firmware.
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It does not pass through the HCI protocol layer.
Hardware on BT800for sending data to and from a SCO connection.
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Up to 3 SCO connections on the PCM interface at any one time.
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PCM interface master, generating PCM_SYNC and PCM_CLK.
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PCM interface slave, accepting externally generated PCM_SYNC and PCM_CLK.
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Various clock formats including:
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Long Frame Sync
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Short Frame Sync
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GCI timing environments
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13-bit or 16-bit linear, 8-bit µ-law or A-law companded sample formats.
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Receives and transmits on any selection of 3 of the first 4 slots following PCM_SYNC.
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The PCM configuration options are enabled by setting PSKEY_PCM_CONFIG32.
9.4.1 PCM Interface Master/Slave
When configured as the master of the PCM interface, BT800generates PCM_CLK and PCM_SYNC.
Figure 2: PCM Interface Master
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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