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WT21-A-HCI

BLUETOOTH HCI MODULE

Unspecified 

Figure 3: AuriStream CODEC and the CVSD CODEC

The AuriStream CODEC is controlled by the TX_RX_VOICEmain block and the processor. Raw

data from the host is read from the MMU by the transmit block. This data is fed via the

TX_RX_VOICE_MAIN module to the required CODEC, the encoded data is then fed back to the

transmit block for broadcast over the Bluetooth interface. During reception, the data is sourced

from the radio and applied to the required CODEC. The decoded data is then stored back to

RAM by the bluetooth receiver.

3.2

Memory Managements Unit

The Memory Management Unit (MMU) provides a number of dynamically allocated ring buffers

that hold the data that 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.

3.3

Burst Mode Controller

During 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 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.

3.4

Physical Layer Hardware Engine DSP

Dedicated logic is used to perform the following:



Forward error correction



Header error correction



Cyclic redundancy check



Encryption



Data whitening



Access code correlation



Audio transcoding

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