BC352239A Datasheet, PDF (77/116 Pages) List of Unclassifed Manufacturers – BlueCore 3-Multimedia External

Device Terminal Descriptions
8.8.9 PCM CODEC Interface
Pulse Code Modulation (PCM) is a standard method used to digitise audio (particularly voice) for transmission
over digital communication channels. Through its PCM interface, BlueCore3-Multimedia External has hardware
support for continual transmission and reception of PCM data, thus reducing processor overhead for wireless
headset applications. BlueCore3-Multimedia External offers a bi directional digital audio interface that routes
directly into the baseband layer of the on chip firmware. It does not pass through the HCI protocol layer.
Hardware on BlueCore3-Multimedia External allows the data to be sent to and received from a SCO connection.
Up to three SCO connections can be supported by the PCM interface at any one time.
BlueCore3-Multimedia External can operate as the PCM interface Master generating an output clock of 128, 256
or 512kHz. When configured as PCM interface slave it can operate with an input clock up to 2048kHz.
BlueCore3-Multimedia External is compatible with a variety of clock formats, including Long Frame Sync, Short
Frame Sync and GCI timing environments.
It supports 13 or 16-bit linear, 8-bit µ-law or A-law companded sample formats at 8ksamples/s and can receive
and transmit on any selection of three of the first four slots following PCM_SYNC. The PCM configuration options
are enabled by setting the PS Key PS KEY_PCM_CONFIG32 (0x1b3).
BlueCore3-Multimedia External interfaces directly to PCM audio devices including the following:
! Qualcomm MSM 3000 series and MSM 5000 series CDMA baseband devices
! OKI MSM7705 four channel A-law and µ-law CODEC
! Motorola MC145481 8-bit A-law and µ-law CODEC
! Motorola MC145483 13-bit linear CODEC
! STW 5093 and 5094 14-bit linear CODECs
! BlueCore3-Multimedia External is also compatible with the Motorola SSI™ interface
BC352239A-ds-001Pc
© Cambridge Silicon Radio Limited 2004
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