FXLS93421 datasheet(153/254 Pages) NXP

153 / 254 page

NXP Semiconductors

FXLS9xxxx

Dual channel inertial sensor

Physical address

Command

Extended data

Error checking

PA3 PA2 PA1 PA0

D15 D14 D13 D12 D11 D10

Table 221. Command and response mode example command descriptions

12.3.1.1 Bit encoding

Figure 70 shows the bit encoding used for Command and Response Mode Commands

from the Master device.

VHIGH

VLOW

aaa-030654

Figure 70. Command and response mode command bit encoding

12.3.1.2 Command message format

The command and response mode command format is shown in Table 222.

Physical address

Command

Extended data

CRC

PA[3:0]

CMD[3:0]

ED[7:0]

RD[7:0]

CRC[7:0]

Table 222. Command and response mode - command format

Field

Length

(Bits)

Definition

PA[3:0]

Physical Address. The physical address must match the value in the PADDR[3:0] of the PHYSADDR

CMD[3:0] 4

Command (see Section 12.3.4)

ED[7:0]

Extended Data (see Section 12.3.4)

RD[7:0]

CRC[7:0] 8

Error Checking (see Section 12.3.1.3)

Table 223. Command and response mode - field definitions

12.3.1.3 Error checking

The device calculates an 8-bit CRC on the entire 32-bits of each command. Message

data is entered into the CRC calculator MSB first, consistent with the transmission

order of the message. If the calculated CRC does not match the transmitted CRC, the

command is ignored and the device does not respond.

The CRC decoding procedure is:

1. A seed value is preset into the least significant bits of the shift register.

2. Using a serial CRC calculation method, the receiver rotates the received message

and CRC into the least significant bits of the shift register in the order received (MSB

first).

3. When the calculation on the last bit of the CRC is rotated into the shift register, the

shift register contains the CRC check result.

4. If the shift register contains all zeros, the CRC is correct.

FXLS9xxxx

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 6 — 8 February 2021

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