參數(shù)資料
型號： EVAL-ADAU1442EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 60/93頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADAU1442
標(biāo)準(zhǔn)包裝： 1
系列： SigmaDSP®
主要目的： 音頻，音頻處理
嵌入式： 是，DSP
已用 IC / 零件： ADAU1442
主要屬性： 單芯片多通道 28/56 位音頻 DSP
次要屬性： I²C & SPI 接口
已供物品： 電路板，線纜，說明文檔，GPIO 子板，電源
ADAU1442/ADAU1445/ADAU1446
Data Sheet
Rev. D | Page 62 of 92
RELIABILITY FEATURES
subsystems designed to increase the reliability of the system
in which they are used. When these functions are used in
conjunction with an external host controller device, the DSP
can recover from serious errors, such as memory corruption or
a program counter crash.
CRC Modes and Settings
Cyclic Redundancy Check (CRC) Registers
(Address 0xE200 to Address 0xE202)
Table 42. Register Details of CRC Registers
Address
Register
Function
Default
Decimal
Hex
57856
E200
CRC Ideal
Value 1
16 MSBs of the
CRC hash sum
0
57857
E201
CRC Ideal
Value 2
16 LSBs of the CRC
hash sum
0
57858
E202
CRC enable
1-bit CRC enable,
active high
0
The CRC constantly checks the validity of the program RAM
contents. SigmaStudio generates a 32-bit hash sum when a
program is compiled that must be written to two consecutive
16-bit register locations. The CRC must then be enabled. Every
4096 frames (88 ms when fS,NORMAL is 48 kHz), the IC generates
its own 32-bit code and compares it with the one stored in these
registers. If they do not match, an MP pin is set high (CRC
flag). This output flag must be enabled using the output CRC
error sticky command in the multipurpose pin control register
The user turns this enable on when continuous CRC checking is
desired. This defaults to off and can be set high after the user
has loaded a program and sent the correct CRC, calculated by
SigmaStudio. If there is an error, it can be cleared by setting the
enable bit low, fixing the error (presumably by reloading the
program) and then setting it high again.
The CRC control registers are configured as follows:
CRC Ideal Value 1 is the 16 MSBs of the CRC code.
CRC Ideal Value 2 is the 16 LSBs of the CRC code.
CRC enable is a 1-bit enable.
The CRC error sticky register is a single-bit read-only register at
Address 57893 (Address 0xE225) that acts as the CRC error flag.
It can optionally be sent to an MP pin. For example, it can connect
to an interrupt pin on an external microcontroller, which triggers
a rewrite of the corrupted memory. The register is reset when
the CRC enable register goes low.
CRC Error Sticky Register (Address 0xE225)
Table 43. Bit Description of Register 0xE225
Bit Position
Description
Default
[15:1]
Reserved
0
CRC error sticky (read only)
0
This single-bit read-only register goes high when there is a CRC
error. It is reset to 0 when the CRC enable is reset to 0.
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