MCP2517FD datasheet(5/98 Pages) MICROCHIP

5 / 98 page

 2017-2018 Microchip Technology Inc.

DS20005688B-page 5

MCP2517FD

2.0

CAN FD CONTROLLER

MODULE

Figure 2-1 shows the main blocks of the CAN FD

Controller module:

• The CAN FD Controller module has multiple

modes:

- Configuration

- Normal CAN FD

- Normal CAN 2.0

-Sleep

- Listen Only

- Restricted Operation

- Internal and External Loop back modes

• The CAN FD Bit Stream Processor (BSP)

implements the Medium Access Control of the

CAN FD protocol described in ISO 11898-1:2015.

It serializes and de-serializes the bit stream,

encodes and decodes the CAN FD frames,

manages the medium access, acknowledges

frames, and detects and signals errors.

• The TX Handler prioritizes the messages that are

requested for transmission by the Transmit

FIFOs. It uses the RAM Interface to fetch the

transmit data from RAM and provides it to the

BSP for transmission.

• The BSP provides received messages to the RX

Handler. The RX Handler uses the Acceptance

Filter to filter out messages that shall be stored

into Receive FIFOs. It uses the RAM Interface to

store received data into RAM.

• Each FIFO can be configured either as a Transmit

or Receive FIFO. The FIFO Control keeps track of

the FIFO Head and Tail, and calculates the User

Address. For a TX FIFO, the User Address points

to the address in RAM where the data for the next

transmit message shall be stored. For a RX FIFO,

the User Address points to the address in RAM

where the data of the next receive message shall

be read. The User notifies the FIFO that a

message was written to or read from RAM by

incrementing the Head/Tail of the FIFO.

• The Transmit Queue (TXQ) is a special transmit

FIFO that transmits the messages based on the

ID of the messages stored in the queue.

• The Transmit Event FIFO (TEF) stores the

message IDs of the transmitted messages.

• A free-running Time Base Counter is used to time

stamp received messages. Messages in the TEF

can also be time stamped.

• The CAN FD Controller module generates

interrupts when new messages are received or

when messages were transmitted successfully.

• The Special Function Registers (SFR) are used to

control and to read the status of the CAN FD

Controller module.

FIGURE 2-1:

CAN FD CONTROLLER MODULE BLOCK DIAGRAM

Note 1:

This data sheet summarizes the features

of the CAN FD Controller module. It is not

intended

comprehensive

reference source. To complement the

information in this data sheet, refer to the

related section of the “MCP25xxFD

Family Reference Manual”.

CAN FD

Protocol

Bit Stream

Processor

RAM

Interface

TX Handler

TX Prioritization

RX Handler

Acceptance

Filter

TXQ Control

TEF

Control

FIFO

Control

SFR

Interrupt

Control

Error

Handling

Diagnostics

Time Stamping

TBC

Mode

Control

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