BCM43455 Preliminary Data Sheet
Bluetooth Baseband Core
Section 5: Bluetooth Baseband Core
The Bluetooth Baseband Core (BBC) implements all of the time critical functions required for high-performance
Bluetooth operation. The BBC manages the buffering, segmentation, and routing of data 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.
The following transmit and receive functions are also implemented in the BBC hardware to increase reliability
and security of the TX/RX data before sending over the air:
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Symbol timing recovery, data deframing, forward error correction (FEC), header error control (HEC), cyclic
redundancy check (CRC), data decryption, and data dewhitening in the receiver.
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Data framing, FEC generation, HEC generation, CRC generation, key generation, data encryption, and
data whitening in the transmitter.
Bluetooth 4.0 Features
The BBC supports all Bluetooth 4.0 features, with the following benefits:
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Dual-mode Bluetooth Low Energy (BT and BLE operation)
Extended Inquiry Response (EIR): Shortens the time to retrieve the device name, specific profile, and
operating mode.
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Encryption Pause Resume (EPR): Enables the use of Bluetooth technology in a much more secure
environment.
Sniff Subrating (SSR): Optimizes power consumption for low duty cycle asymmetric data flow, which
subsequently extends battery life.
Secure Simple Pairing (SSP): Reduces the number of steps for connecting two devices, with minimal or no
user interaction required.
Link Supervision Time Out (LSTO): Additional commands added to HCI and Link Management Protocol
(LMP) for improved link time-out supervision.
QoS enhancements: Changes to data traffic control, which results in better link performance. Audio, human
interface device (HID), bulk traffic, SCO, and enhanced SCO (eSCO) are improved with the erroneous data
(ED) and packet boundary flag (PBF) enhancements.
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 38
BROADCOM CONFIDENTIAL
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