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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AK7755EN 데이터시트(PDF) 94 Page - Asahi Kasei Microsystems |
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AK7755EN 데이터시트(HTML) 94 Page - Asahi Kasei Microsystems |
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94 / 109 page  [AK7755] 014006643-E-00 2014/10 - 94 - ■ Simple Write Error Check RAM and register data can be checked by cyclic redundancy check (CRC). It realizes a simple error check of a written data. 1. Checked Data 1-1. SPI Interface The serial input data of the AK7755 can be checked from a falling edge of the CSN signal to rising edge of the CSN signal. · Serial Data D (x): Input data from a falling edge to a rising edge of the CSN. · Generating Polynomial: G(x)=x 16+x12+x5+1 (default=0) · R(x) is defined as the remainder when D(x) is divided by G(x). CSN SCLK SI Command Code (8bit) Address (16bit or 0bit) Data (write) don’tcare (L/H) X (L/H) 1-2. I 2C Interface The data after second byte: command code, address and data are checked. (Acknowledge is not included in the checked data. Therefore, if the command code, address and data are the same as when SPI interface is used, the CRC error result will also be the same.) The first byte which includes slave address is excluded. The first byte can be checked with Acknowledge. · Serial Data D(x): Command Code, Address and Data (Expect slave address) · Generating Polynomial: G(x)=x 16+x12+x5+1 (default=0) · R (x) is defined as the remainder when D(x) is divided by G(x). 2. Simple Write Error Check Sequence There are two ways to execute a simple write error check. 2-1. CRC Result Reading (1) Write serial data D(x) that need to be checked. (2) Read CRC result (the remainder R(x)) by the command code 72h. (3) Check the result by a microcomputer. (4) Repeat (1) ~ (3) when checking another serial data. Note 55. The internal CRC result is not reflected by the command code 2-2. Checking by the STO pin (1) Set control register CRCE bit to “1”. (2) Write serial data D(x) that need to be checked. (3) Write the remainder R(x) of D(x) ti registers by the command code F2H. (4) The SDO pin outputs “H” when the calculated remainder of D(x) divided by G(x) equals to the R(x) value. If not, the STO pin outputs “L”. (5) Repeat (2) ~ (4) when checking another serial data. Note 56. The STO pin keeps “L” output until an appropriate remainder R(x) is written to the registers. |
유사한 부품 번호 - AK7755EN_16 |
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