CYW20705 datasheet(10/51 Pages) CYPRESS

10 / 51 page

Document Number: 002-14867 Rev. *F

Page 10 of 51

CYW20705

3. Bluetooth Baseband Core

The Bluetooth Baseband Core (BBC) implements the time critical functions required for high-performance Bluetooth and Low Energy

operation. The BBC manages buffering, segmentation, and data routing for all connections. It also buffers data that passes through

it, handles data flow control, schedules SCO/ACL Tx/Rx transactions, monitors Bluetooth slot usage, optimally segments and

packages data into baseband packets, manages connection status indicators, and composes and decodes HCI packets. In addition

to these functions, it independently handles HCI event types and HCI command types.

3.1 Transmit and Receive Functions

The following transmit and receive functions are implemented in the BBC hardware to increase the reliability and security of the Tx/

Rx data before sending the data over the air:

In the transmitter:

■ Data framing

■ Forward Error Correction (FEC) generation

■ Header Error Control (HEC) generation

■ Cyclic Redundancy Check (CRC) generation

■ Key generation

■ Data encryption

■ Data whitening

In the receiver:

■ Symbol timing recovery

■ Data deframing

■ FEC

■ HEC

■ CRC

■ Data decryption

■ Data dewhitening

3.2 Bluetooth 4.1 + EDR Features

The CYW20705 supports Bluetooth 4.1 + EDR and Low Energy, including the following options:

■ A whitelist size of 25

■ Enhanced Power Control

■ HCI Read Encryption Key Size command

The CYW20705 provides full support for Bluetooth 2.1 + EDR additional features:

■ Secure Simple Pairing (SSP)

■ Encryption Pause Resume (EPR)

■ Enhance Inquiry Response (EIR)

■ Link Supervision Time Out (LSTO)

■ Sniff SubRating (SSR)

■ Erroneous Data (ED)

■ Packet Boundary Flag (PBF)

3.3 Frequency Hopping Generator

The frequency hopping sequence generator selects the correct hopping channel number, based on the link controller state, Bluetooth

clock, and device address.

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