CYW20705B0KWFBGT datasheet(26/67 Pages) CYPRESS

No de pièce	CYW20705B0KWFBGT

Description	Single-Chip Bluetooth Transceiver and Baseband Processor

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Fabricant	CYPRESS [Cypress Semiconductor]

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NVRAM Configuration Data and Storage

BCM20705 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

Bluetooth Transceiver and Baseband Processor

November 13, 2014 • MCS20705-DS104-R

Page 25

NVRAM Configuration Data and Storage

Serial Interface

The BCM20705 includes an SPI master controller that can be used to access serial flash memory. The SPI

master contains an AHB slave interface, transmit and receive FIFOs, and the SPI core PHY logic. Data is

transferred to and from the module by the system CPU. DMA operation is not supported.

The BCM20705 supports serial flash vendors Atmel®, MXIC, and Numonyx™. The most commonly used parts

from two of these vendors are:

• AT25BCM512B, manufactured by Atmel

• MX25V512ZUI-20G, manufactured by MXIC

EEPROM

The BCM20705 includes a Broadcom Serial Control (BSC) master interface. The BSC interface supports low-

speed and fast mode devices and is compatible with I2C slave devices. Multiple I2C master devices and flexible

wait state insertion by the master interface or slave devices are not supported. The BCM20705 provides 400

kHz, full speed clock support.

The BSC interface is programmed by the CPU to generate the following BSC transfer types on the bus:

• Read-only

•Write-only

• Combined read/write

• Combined write-read

NVRAM may contain configuration information about the customer application, including the following:

• Fractional-N information

•BD_ADDR

• UART baud rate

• USB enumeration information

• SDP service record

• File system information used for code, code patches, or data

External Reset

The BCM20705 has an integrated power-on reset circuit which completely resets 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 RST_N signal input is an active-low signal for all versions of

the BCM20705. The BCM20705 requires an external pull-up resistor on the RST_N input. Alternatively, the

RST_N input can be connected to REG_EN or driven directly by a host GPIO.

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