FXLS93421 datasheet(211/254 Pages) NXP

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NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

Default polynomial

Non-direct seed

x3 + x + 1

SPICRCSEED[2:0]

Table 330. SPI response message CRC, 3-bit

14.4.3.5 Message (KAC) with 3-bit CRC

If the 3-bit CRC is enabled, a 4-bit message counter field (KAC) is added to the Sensor

Data Request Response. The message counter field is a 4-bit rolling message counter

that is independently incremented for each SOURCEID. The initial value of the counter is

'0001'.

14.4.3.6 Example 3-bit CRC calculations

Some example CRC calculations for 32-bit SPI commands are shown in Table 331.

Bits[31:28]

Bits[27:24]

Bits[23:16]

Bits[15:8]

Bits[7:3]

Bits[2:0]

Polynomial

Seed

Command

(Hex)

0x0

(Hex)

0b00000

(Binary)

3-bit CRC

(Binary)

x3 + x + 1

111

0x8

0x0

0b00000

0b100

x3 + x + 1

111

0x4

0x0

0b00000

0b010

x3 + x + 1

111

0xC

0x0

0b00000

0b001

x3 + x + 1

111

0x6

0x0

0b00000

0b000

x3 + x + 1

111

0x4

0x0

0b00000

0b000

x3 + x + 1

111

0xC

0x0

0b00000

0b101

x3 + x + 1

111

0x6

0x0

0b00000

0b010

Table 331. SPI 3-bit CRC calculation examples

14.5 Exception handling

14.5.1 Standard basic status reporting field

All responses include a basic status field (ST[1:0]) that includes the general status of the

device and transmitted data as described in Table 332 and Table 333. The contents of

the basic status field is a representation of the device status at the rising edge of SS_B

for the previous SPI command.

14.5.1.1 Basic status field for responses to register commands

ST[1:0]

Status

Description

Priority

Device in Initialization

ENDINIT Not Set

Normal Mode

ENDINIT Set

Self-test

ST_CTRL[3:0] not equal to '0000' for any channel

Internal Error Present

See Figure 95

Table 332. Basic status field for responses to register commands

FXLS9xxxx

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Product data sheet

Rev. 6 — 8 February 2021

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