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CS48500 Fiches technique(PDF) 11 Page - Cirrus Logic

No de pièce CS48500
Description  Cost-effective, High-performance 32-bit DSP
Download  28 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS48500 Fiches technique(HTML) 11 Page - Cirrus Logic

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CS48500 Data Sheet
32-bit Audio Decoder DSP Family
DS734A3
©Copyright 2006 Cirrus Logic, Inc.
11
CONFIDENTIAL
4.2.6 Hardware Watchdog Timer
The CS48500 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 CS48500 will reset itself in the event of a temporary system failure. In stand-
alone mode (i.e. no host mcu), the DSP will reboot from external FLASH. In slave mode (i.e. 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 CS48500 pins are multi-functional. For details on pin functionality please refer to the
CS48500 Hardware User’s Manual.
4.3.2 Termination Requirements
Open-drain pins on the CS48500 must be pulled high for proper operation. Please refer to the CS48500
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 on the CS48500 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 CS48500 Hardware User’s Manual.
4.3.3 Pads
The CS48500 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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