Difference between module clock and CHI clock in FlexCAN

KKumar — Tue, 29 Mar 2022 13:50:26 GMT

Hi NXP,

i am bit confuse between the module clock and CHI clock of FlexCAN module (as shown in image)of S32K.

Plz explain the difference and their uses.

Re: Difference between module clock and CHI clock in FlexCAN

Senlent — Wed, 30 Mar 2022 02:00:55 GMT

below infos comes from S32K-RM Chapter 55.2.1 Overview

The Protocol Engine (PE) submodule manages the serial communication on the CAN

bus:

The Controller Host Interface (CHI) submodule manages message buffer selection for

reception and transmission, taking care of arbitration and ID matching algorithms for

both CAN FD and non-CAN FD message formats.

The Bus Interface Unit (BIU) submodule controls access to and from the internal

interface bus, in order to establish connection to the CPU and to other blocks. Clocks,

address and data buses, interrupt outputs, DMA and test signals are accessed through the

BIU.

BR!

Jim,