User's Manual
Table Of Contents
- 2035-UM1xx.book
- Table of Contents
- List of Figures
- List of Tables
- Section 1: Introduction
- Section 2: Hardware System Overview
- Section 3: BCM2035 Usage Models
- Section 4: Hardware Configuration
- Section 5: Software Configuration
- Introduction
- Hardware Power-Up Sequence
- Boot ROM Power-Up Sequence
- Firmware Power-Up Sequence
- BCM2035 Mini-Drivers
- Loading Mini-Drivers from USB
- Load Mini-Drivers From UART
- SCO Configuration
- Frequency Trimming
- UART Sleep Mode Operation
- Section 6: Configuration Data File System
- Section 7: Vendor-Specific HCI Command Reference
- Section 8: ASCII Hex File Download Protocol
- Section 9: ASCII HEX File Format
- Section 10: Configuration Data Download Protocol
- Section 11: Configuration Data Image Format
- Section 12: UART Start-up Sequence
- Section 13: USB Start-up Sequence
9/29/2004 OV4F2
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BCM2035 User Manual
04/23/03
Broadcom Corporation
Page 14 System Control Document 2035-UM100-R
SYSTEM CONTROL
SYSTEM CLOCK
The
BCM2035 uses two different clock references for normal and low-power operational modes. For normal
operation, the BCM2035 uses an external crystal or external frequency reference driven by a temperature
compensated crystal oscillator (TCXO) to generate all radio frequencies and system timing references. For low
power mode operation, the
BCM2035 uses either an external 32.768 kHz or fully integrated internal low-power
oscillator (LPO) for system timing reference.
EXTERNAL RESET
The
BCM2035 has an integrated power-on reset circuit, which will which will completely reset all circuits to a
known power on state. This action can also be driven by an external reset signal, which can be used to
externally control the device, forcing it into a power-on reset state. The signal input, RESET_N is an active low
signal that has an internal pull-up resistor and is not required to be connected in most applications. No external
pull-up resistor is required.
EXTERNAL TDD SWITCH CONTROL
The
BCM2035 provides two signals to control an external time division duplex (TDD) or transmit and receiver
(T/R) switch. A differential output, TX_PU_TDD and TX_PU_TDD_N, active high and active low signals are
provided to simplify interfacing to any switch or pin-diode type switch.
PERIPHERAL TRANSPORT UNIT
PCM INTERFACE
The PCM Interface on the
BCM2035 can connect to linear PCM Codec devices in master or slave mode. In
master mode, the BCM2035 generates the PCM_BCLK and PCM_SYNC signals, and in slave mode, these
signals are provided by another master on the PCM interface and are inputs to the BCM2035. The PCM
interface may also be configured in a hybrid mode such that the PCM_BCLK signal comes from the master,
while the PCM_SYNC signal comes from the slave, or vice-versa.
The
BCM2035 supports up to three SCO channels through the PCM Interface and each channel can be
independently mapped to any of the available slots in a frame.
The configuration of the PCM interface may be adjusted by the host through the use of Vendor Specific HCI
Commands.