FXLS93421 datasheet(78/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

11.2.20.3 SPI CRC length and seed bits (SPI_CRC_LEN[1:0], SPICRCSEED[3:0])

The SPI_CRC_LEN[1:0] bits select the CRC length for SPI mode as shown in Table 132.

The SPI CRC seed bits contain the seed used for the SPI Mode. The default SPI CRC is

an 8-bit. When the SPI_CRC_LEN[1:0] bits are set to a non-zero value using a register

write command, the SPI CRC changes as defined in the table. The new polynomial value

is enabled for both MISO and MOSI on the next SPI mode command.

The default seed (SPICRCSEED[3:0] = 0x0) is 0xFF for an 8-bit CRC. When the value

is changed to a non-zero value using a register write command, the SPI CRC seed

changes to the value programmed as shown in the table. The new seed value is enabled

for both MISO and MOSI on the next SPI mode command.

SPI_CRC_

LEN[1:0]

SPICR

CSEED

CRC polynomial

CRC seed

1111, 1111

Non-Zero

x8 + x5 + x3 + x2 + x + 1

1111,

SPICRCSEED[3:0]

1010

Non-Zero

x4 + 1

SPICRCSEED[3:0]

111

Non-Zero

x3 + x + 1

SPICRCSEED[2:0]

111

Non-Zero

x3 + x + 1

SPICRCSEED[2:0]

Table 132. SPI CRC length and seed bits (SPI_CRC_LEN[1:0], SPICRCSEED[3:0])

In PSI5 mode, the SPI CRC bits are readable and writable, but have no impact on device

operation or performance.

In DSI3 mode, the SPI CRC bits are readable and writable, but have no impact on device

operation or performance.

In I2C mode, the SPI CRC bits are readable and writable, but have no impact on device

operation or performance.

11.2.21 Who Am I register

The Who Am I register is a user programmed read/write register which contains the

unique product identifier for I2C mode. The register is readable in all modes. This register

is included in the read/write array error detection.

This register is readable and writable in DSI3 mode, SPI mode, I2C mode or PSI5

Programming Mode.

Location

Bit

Address Register

$3E

WHO_

AM_I

WHO_AM_I[7:0]

Unprogrammed

OTP Value

Table 133. Who Am I register

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

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