BCM89071A1CUBXGT Datasheet, PDF (26/69 Pages) Cypress Semiconductor – Single-Chip Automotive Grade Bluetooth Transceiver and Baseband Processor

BCM89071 Data Sheet
Microprocessor Unit
Section 4: Microprocessor Unit
The BCM89071 microprocessor unit runs software from the Link Control (LC) layer up to the Host Controller
Interface (HCI). The microprocessor is based on the ARM7TDMIS 32-bit RISC processor with embedded ICE-
RT debug and JTAG interface units. The microprocessor also includes 384 KB of ROM memory for program
storage and boot ROM, 112 KB of RAM for data scratch-pad, and patch RAM code.
The internal boot ROM provides flexibility during power-on reset to enable the same device to be used in various
configurations, including automatic host transport selection from SPI or UART, with or without external NVRAM.
At power-up, the lower layer protocol stack is executed from the internal ROM.
External patches can be applied to the ROM-based firmware to provide flexibility for bug fixes and features
additions. These patches can be downloaded from the host to the device through the SPI or UART transports,
or using external NVRAM. The device can also support the integration of user applications and profiles using
an external serial flash memory.
NVRAM Configuration Data and Storage
Serial Interface
The BCM89071 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 BCM89071 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
Broadcom^®
April 16, 2015 • 89071-DS106-R
Baseband Transceiver and Baseband Processor
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