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CS48DV2B-CQZ датащи(PDF) 9 Page - Cirrus Logic

номер детали CS48DV2B-CQZ
подробное описание детали  32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS48DV2B-CQZ датащи(HTML) 9 Page - Cirrus Logic

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CS48DV2B Data Sheet
32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby
DS875F2
Copyright 2009 Cirrus Logic
9
CONFIDENTIAL
4.2.6 Hardware Watchdog Timer
The CS48DV2B has an integrated watchdog timer that acts as a “health” monitor for the DSP. The
watchdog timer must be reset by the DSP before the counter expires, or the entire chip is reset. This
peripheral ensures that the CS48DV2B will reset itself in the event of a temporary system failure. In
stand-alone mode (that is, no host MCU), the DSP will reboot from external FLASH. In slave mode
(that is, host MCU present) a GPIO will be used to signal the host that the watchdog has expired and
the DSP should be rebooted and re-configured.
4.3 DSP I/O Description
4.3.1 Multiplexed Pins
Many of the CS48DV2B pins are multi-functional. For details on pin functionality please refer to the
CS485xx Hardware User’s Manual.
4.3.2 Termination Requirements
Open-drain pins on the CS48DV2B must be pulled high for proper operation. Please refer to the
CS485xx Hardware User’s Manual to identify which pins are open-drain and what value of pull-up
resistor is required for proper operation.
Mode select pins in the CS48DV2B are used to select the boot mode upon the rising edge from
reset. A detailed explanation of termination requirements for each communication mode select pin
can be found in the CS485xx Hardware User’s Manual.
4.3.3 Pads
The CS48DV2B I/Os operate from the 3.3 V supply and are 5 V tolerant.
4.4 Application Code Security
The external program code may be encrypted by the programmer to protect any intellectual property
it may contain. A secret, customer-specific key is used to encrypt the program code that is to be
stored external to the device. Please contact your local Cirrus representative for details.


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