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CYW20705B0KWFBGT Fiches technique(PDF) 26 Page - Cypress Semiconductor |
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CYW20705B0KWFBGT Fiches technique(HTML) 26 Page - Cypress Semiconductor |
26 / 67 page 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. |
Numéro de pièce similaire - CYW20705B0KWFBGT |
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Description similaire - CYW20705B0KWFBGT |
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