BC41B143A-ds-003Pc CSR, BC41B143A-ds-003Pc Datasheet - Page 66

• Manufacturer Part Number: BC41B143A-ds-003Pc
• Description: Blue Core ROM Plug-n-Go
• Manufacturer: CSR

10.7
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 Plug-n-Go has hardware support for
continual transmission and reception of PCM data, thus reducing processor overhead for wireless headset
applications. BlueCore4-ROM Plug-n-Go 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 Plug-n-Go 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 Plug-n-Go 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
Plug-n-Go 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 the PS Key PS KEY_PCM_CONFIG32 (0x1b3).
BlueCore4-ROM Plug-n-Go interfaces directly to PCM audio devices including the following:
BC41B143A-ds-003Pc
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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 Plug-n-Go is also compatible with the Motorola SSI™ interface
Subject to firmware support. Contact CSR for current status.
PCM CODEC Interface
© Cambridge Silicon Radio Limited 2005
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Device Terminal Descriptions
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