參數資料
型號: ADAU1761BCPZ-RL
廠商: Analog Devices Inc
文件頁數: 79/92頁
文件大?。?/td> 0K
描述: IC SIGMADSP CODEC PLL 32LFCSP
設計資源: Stereo Digital Microphone Input Using ADAU1761 and ADMP421 (CN0078)
標準包裝: 5,000
系列: SigmaDSP®
類型: 音頻編解碼器
數據接口: 串行
分辨率(位): 24 b
ADC / DAC 數量: 2 / 2
三角積分調變:
電壓 - 電源,模擬: 1.8 V ~ 3.65 V
電壓 - 電源,數字: 1.63V ~ 3.65V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤,CSP
供應商設備封裝: 32-LFCSP-VQ
包裝: 帶卷 (TR)
配用: EVAL-ADAU1761Z-ND - BOARD EVAL FOR ADAU1761
ADAU1761
Rev. C | Page 80 of 92
R43 to R47: Cyclic Redundancy Check Registers, 16,576 to 16,580 (0x40C0 to 0x40C4)
The cyclic redundancy check (CRC) constantly checks the validity of the program RAM contents. SigmaStudio generates a 32-bit hash
sum, which must be written to four consecutive read-only 8-bit register locations. CRC must then be enabled. Every 1024 frames (21 ms
at 48 kHz), the IC generates its own 32-bit code and compares it to the one stored in these registers. If the codes do not match, a GPIO pin
is set high (CRC flag). This output flag must be enabled using the output CRC error sticky setting in the GPIO pin control register (see
Table 79). The 1-bit CRC error flag is reset when the CRCEN bit goes low. For example, a GPIO pin can be connected to an interrupt pin
on an external microcontroller, which triggers a rewrite of the corrupted memory.
By default, CRC is disabled (the CRCEN bit is set to 0). To enable continuous CRC checking, the user can set the CRCEN bit to 1 after
loading a program and sending the correct CRC, which is calculated by SigmaStudio. If an error occurs, it can be cleared by setting the
CRCEN bit low, fixing the error (presumably by reloading the program), and then setting the CRCEN bit high again.
Address
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0x40C0
CRC[31:24]
0x40C1
CRC[23:16]
0x40C2
CRC[15:8]
0x40C3
CRC[7:0]
0x40C4
Reserved
CRCEN
Table 78. Cyclic Redundancy Check Registers
Address
Register
Decimal
Hex
Bit Name
Description
R43
16,576
0x40C0
CRC[31:24]
CRC hash sum, Bits[31:24] (read-only register)
R44
16,577
0x40C1
CRC[23:16]
CRC hash sum, Bits[23:16] (read-only register)
R45
16,578
0x40C2
CRC[15:8]
CRC hash sum, Bits[15:8] (read-only register)
R46
16,579
0x40C3
CRC[7:0]
CRC hash sum, Bits[7:0] (read-only register)
R47
16,580
0x40C4
CRCEN
CRC enable
0 = disabled (default)
1 = enabled
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