CSR BlueCore CSR8640 BGA, User Manual

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Baud Rate
Persistent Store Value
Error
Hex Dec
19200 0x004f 79 0.45%
38400 0x009d 157 -0.18%
57600 0x00ec 236 0.03%
76800 0x013b 315 0.14%
115200 0x01d8 472 0.03%
230400 0x03b0 944 0.03%
460800 0x075f 1887 -0.02%
921600 0x0ebf 3775 0.00%
1382400 0x161e 5662 -0.01%
1843200 0x1d7e 7550 0.00%
2764800 0x2c3d 11325 0.00%
3686400 0x3afb 15099 0.00%
Table 7.2: Standard Baud Rates
7.3 Programming and Debug Interface
CSR8640 BGA provides a debug SPI interface for programming, configuring (PS Keys) and debugging the
CSR8640 BGA. Access to this interface is required in production. Ensure the 4 SPI signals and the SPI/PCM# line
are brought out to either test points or a header. To use the SPI interface, the SPI/PCM# line requires the option of
being pulled high externally.
CSR provides development and production tools to communicate over the SPI from a PC, although a level translator
circuit is often required. All are available from CSR.
7.3.1 Multi-slave Operation
Avoid connecting CSR8640 BGA in a multi-slave arrangement by simple parallel connection of slave MISO lines.
When CSR8640 BGA is deselected (SPI_CS# = 1), the SPI_MISO line does not float. Instead, CSR8640 BGA
outputs 0 if the processor is running or 1 if it is stopped.
7.4 I²C EEPROM Interface
CSR8640 BGA supports optional I²C EEPROM for storage of PS Keys and voice prompt data if SPI flash is not used.
Figure 7.2 shows an example I²C EEPROM connection where:
■
PIO[10] is the I²C EEPROM SCL line
■ PIO[11] is the I²C EEPROM SDA line
■ PIO[12] is the I²C EEPROM WP line
Advance Information
This material is subject to CSR's non-disclosure agreement
© Cambridge Silicon Radio Limited 2011
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CSR8640 BGA
Data Sheet