BC41B143A-DS-001PE Datasheet, PDF(39/102 Page) List of Unclassifed Manufacturers – BlueCpre 4-ROM Single Chip Bluetooth v2.0 System with EDR

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BC41B143A-DS-001PE Datasheet, PDF (39/102 Pages) List of Unclassifed Manufacturers – BlueCpre 4-ROM Single Chip Bluetooth v2.0 System with EDR

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Description of Functional Blocks

7.5 Clock Input and Generation

The reference clock for the system is generated from a TCXO or crystal input between 8 and 40MHz. All internal

reference clocks are generated using a phase locked loop, which is locked to the external reference frequency.

7.6 Baseband and Logic

7.6.1 Memory Management Unit

The Memory Management Unit (MMU) provides a number of dynamically allocated ring buffers that hold the data

which is in transit between the host and the air. The dynamic allocation of memory ensures efficient use of the

available Random Access Memory (RAM) and is performed by a hardware MMU to minimise the overheads on

the processor during data/voice transfers.

7.6.2 Burst Mode Controller

During radio transmission the Burst Mode Controller (BMC) constructs a packet from header information

previously loaded into memory-mapped registers by the software and payload data/voice taken from the

appropriate ring buffer in the RAM. During radio reception, the BMC stores the packet header in memory-mapped

registers and the payload data in the appropriate ring buffer in RAM. This architecture minimises the intervention

required by the processor during transmission and reception.

7.6.3 Physical Layer Hardware Engine DSP

Dedicated logic is used to perform the following:

! Forward error correction

! Header error control

! Cyclic redundancy check

! Encryption

! Data whitening

! Access code correlation

! Audio transcoding

The following voice data translations and operations are performed by firmware:

! A-law/Î¼-law/linear voice data (from host)

! A-law/Î¼-law/Continuously Variable Slope Delta (CVSD) (over the air)

! Voice interpolation for lost packets

! Rate mismatches

The hardware supports all optional and mandatory features of Bluetest v1.2 including AFH and eSCO.

7.6.4 RAM

48Kbytes of on-chip RAM is provided to support the RISC MCU and is shared between the ring buffers used to

hold voice/data for each active connection and the general purpose memory required by the Bluetooth stack.

7.6.5 ROM

4Mbits of metal programmable ROM is provided for system firmware implementation.

BC41B143A-ds-001Pe

This material is subject to CSRâs non-disclosure agreement

Production Information

Page 39 of 102

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