BCM20705 Data Sheet
Table of Contents
Section 4: Microprocessor Unit ....................................................................................... 24
Overview...................................................................................................................................................... 24
NVRAM Configuration Data and Storage ................................................................................................. 25
Serial Interface ...................................................................................................................................... 25
EEPROM...................................................................................................................................................... 25
External Reset............................................................................................................................................. 25
One-Time Programmable Memory............................................................................................................ 26
Contents................................................................................................................................................ 27
Programming......................................................................................................................................... 27
Section 5: Peripheral Transport Unit............................................................................... 28
PCM Interface.............................................................................................................................................. 28
System Diagram.................................................................................................................................... 28
Slot Mapping ......................................................................................................................................... 29
Wideband Speech................................................................................................................................. 29
Frame Synchronization ......................................................................................................................... 30
Data Formatting..................................................................................................................................... 30
HCI Transport Detection Configuration.................................................................................................... 30
USB Interface.............................................................................................................................................. 31
Features................................................................................................................................................ 31
Operation............................................................................................................................................... 31
USB Hub and UHE Support .................................................................................................................. 32
UART Interface............................................................................................................................................ 33
HCI 3-Wire Transport (UART H5) ......................................................................................................... 33
SPI................................................................................................................................................................ 34
Simultaneous UART Transport and Bridging.......................................................................................... 34
Section 6: Frequency References.................................................................................... 35
Crystal Interface and Clock Generation ................................................................................................... 35
Crystal Oscillator........................................................................................................................................ 37
External Frequency Reference.................................................................................................................. 37
TCXO Clock Request Support .............................................................................................................. 38
Frequency Selection .................................................................................................................................. 38
Frequency Trimming.................................................................................................................................. 39
LPO Clock Interface ................................................................................................................................... 39
Section 7: Pin-out and Signal Descriptions.................................................................... 40
Pin Descriptions ......................................................................................................................................... 40
Broadcom®
Bluetooth Transceiver and Baseband Processor
November 13, 2014 • MCS20705-DS104-R
Page 4
BROADCOM CONFIDENTIAL
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