bc41b143a07 ETC-unknow, bc41b143a07 Datasheet - Page 71

• Manufacturer Part Number: bc41b143a07
• Description: Single Chip Bluetooth
• Manufacturer: ETC-unknow

9.7
Pulse Code Modulation (PCM) is a standard method used to digitise audio (particularly voice) for transmission over
digital communication channels. Through its PCM interface, BlueCore4-ROM has hardware support for continual
transmission and reception of PCM data, thus reducing processor overhead for wireless headset applications.
BlueCore4-ROM 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 BlueCore4-ROM 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.
BlueCore4-ROM 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. BlueCore4-ROM is compatible
with a variety of clock formats, including Long Frame Sync, Short Frame Sync and GCI timing environments.
It supports 13-bit 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 PSKEY_PCM_CONFIG32 (0x1b3).
BlueCore4-ROM interfaces directly to PCM audio devices including the following:
9.7.1
When configured as the master of the PCM interface, BlueCore4-ROM generates PCM_CLK and PCM_SYNC.
When configured as the Slave of the PCM interface, BlueCore4-ROM accepts PCM_CLK rates up to 2048kHz.
CS-101564-DSP12
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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
BlueCore4-ROM is also compatible with the Motorola SSI interface
Subject to firmware support. Contact CSR for current status.
PCM CODEC Interface
PCM Interface Master/Slave
Figure 9.16: BlueCore4-ROM as PCM Interface Master
BlueCore
PCM_SYNC
PCM_OUT
PCM_CLK
PCM_IN
Production Information
© CSR plc 2003-2007
128/256/512kHz
8kHz
Device Terminal Descriptions
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