Xilinx CAN FD v2.0 Manual de usuario

CAN FD v2.0

LogiCORE IP Product Guide

Vivado Design Suite

PG223 December 5, 2018

CAN FD v2.0 2

PG223 December 5, 2018 www.xilinx.com

Table of Contents

IP Facts

Chapter 1: Overview

Core Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Licensing and Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 2: Product Specification

Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Resource Utilization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Port Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Register Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chapter 3: Designing with the Core

Operating Modes and States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Clocking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Chapter 4: Design Flow Steps

Customizing and Generating the Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Constraining the Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Synthesis and Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Chapter 5: Example Design

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Simulating the Example Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

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Chapter 6: Test Bench

Appendix A: Verification, Compliance, and Interoperability

Compliance Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Appendix B: Upgrading

Upgrading in the Vivado Design Suite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Appendix C: Debugging

Finding Help on Xilinx.com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Debug Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Hardware Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Interface Debug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Appendix D: Additional Resources and Legal Notices

Xilinx Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Documentation Navigator and Design Hubs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Please Read: Important Legal Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

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CAN FD v2.0 4

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Introduction

The Xilinx® LogiCORE™ IP CAN with Flexible

Data Rate (CAN FD) core is ideally suited for

automotive and industrial applications such as

automotive body control units, automotive test

equipment, instrument clusters, sensor

controls, and industrial networks. The core can

be used in standalone mode or connected to

Xilinx MicroBlaze™ processors or the Arm®

Cortex-A9 processors in Zynq®-7000 SoCs.

Features

• Designed to ISO 11898-1/2015

specification [Ref 1]

• Supports both CAN and CAN FD frames

• Supports the CAN FD frame format

specified in the ISO 11898:2015

specification [Ref 1]

• Supports up to 64 byte CAN FD frames

• Supports flexible data rates up to 8 Mb/s

• Supports nominal data rates up to 1Mb/s

• Up to three data bit transmitter delay

compensation

• TX and RX mailbox buffers with

configurable depth

• Two 64-deep RX FIFOs with 32 ID

Filter-Mask pairs

• Message with lowest ID transmitted first

• Supports TX message cancellation

• Separate error logging for fast data rate

IMPORTANT: It is required to have a valid Bosch CAN

FD protocol license before selling a device containing

the Xilinx CAN FD IP core.

IP Facts

LogiCORE™ IP Facts Table

Core Specifics

Supported

Device Family(1)

UltraScale+™

UltraScale™

Zynq®-7000 SoC, 7 Series,

Zynq UltraScale+ MPSoC Architecture

Supported User

Interfaces AXI4-Lite, APB

Resources Performance and Resource Utilization web page

Provided with Core

Design Files Encrypted RTL

Example Design Verilog

Test Bench Verilog

Constraints File XDC

Simulation

Model Not Provided

Supported

S/W Driver(2) Standalone and Linux

Tested Design Flows(3)

Design Entry Vivado® Design Suite

Simulation For supported simulators, see the

Xilinx Design Tools: Release Notes Guide.

Synthesis Vivado Synthesis

Support

Provided by Xilinx at the Xilinx Support web page

Notes:

1. For a complete listing of supported devices, see the Vivado IP

catalog.

2. Standalone driver details can be found in the SDK directory

(\Xilinx\SDK\<release_version>\data\embeddedsw\XilinxPro

cessorIPLib\drivers\canfd_version). Linux OS and driver

support information is available from the Linux CAN FD

Driver Page.

3. For the supported versions of the tools, see the

Xilinx Design Tools: Release Notes Guide.

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IP Facts

Other Features

• Timestamp for transmitted and received messages

• Supports transmit event FIFO

• Supports the following modes:

°Disable Auto-Retransmission (DAR) mode

°Snoop (Bus Monitoring) mode

°Sleep mode with Wake-Up Interrupt

°Internal Loopback mode

°Bus-Off Recovery mode

-Auto-Recovery

- User intervention for Auto-Recovery

°Disable Protocol Exception Event mode

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Chapter 1

Overview

This product guide describes features of the CAN FD core and the functionality of the

various registers in the design. In addition, the core interface and its customization options

are defined in this document. Information on the CAN or CAN FD protocol is outside the

scope of this document, and knowledge of the relevant CAN and CAN FD specifications is

assumed. Figure 1-1 illustrates the high-level architecture of the CAN FD core and provides

the interface connectivity.

Note: The core requires an external PHY to be connected to communicate on the CAN bus.

X-Ref Target - Figure 1-1

Figure 1-1: CAN FD Core Layered Architecture and Connectivity

CAN FD Core

Host

Control

Object Layer/LLC

AXI4-Lite

I/F

TX Block

RAM

TBMM

RX Block

RAM

RBMM

CDC

Sync

AXI Clock Domain

CAN FD Protocol Engine

Transfer Layer/MAC

CAN Clock Domain

PHY

CAN Bus

AXI4-Lite Bus

X14811-081418

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Chapter 1: Overview

Core Description

The core functions are divided into two independent layers as shown in Figure 1-1. The

object layer interfaces with the host control through the AXI4-Lite/APB interface and works

in the AXI4-Lite/APB clock domain. The transfer layer interfaces with the external PHY and

operates in the CAN clock domain. Information exchange between the two layers is done

through the CDC synchronizers. The CAN FD object layer provides a state-of-the-art

transmission and reception method to manage message buffers.

Object Layer (Logical Link Layer)

The object layer is divided into the following submodules:

•Register Module – This module allows for read and write access to the registers

through the external host interface.

•TX Buffer Management Module – The TX Buffer Management Module (TBMM)

interfaces with the CAN FD protocol engine to provide the next buffer to transmit on

the CAN bus. It manages the host access to the TX block RAM.

•RX Buffer Management Module – The RX Buffer Management Module (RBMM)

interfaces with the CAN FD protocol engine to provide storage for message reception

from the CAN bus. It manages the host access to the RX block RAM.

Transfer Layer (Medium Access Control Layer)

The transfer layer provides the following main functions:

• Initiation of the transmission process after recognizing bus idle (compliance with

inter-frame space)

°Serialization of the frame

°Bit stuffing

°Arbitration and passing into receive mode in case of loss of arbitration

°ACK check

°Presentation of a serial bitstream to PHY for transmission

°CRC sequence calculation including stuff bit count for FD frames

°Bit rate switching

• Reception of a serial bitstream from the PHY

°Deserialization and recompiling of the frame structure

°Bit destuffing

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Chapter 1: Overview

°Transmission of ACK

°Bit rate switching

• Bit timing functions

• Error detection and signaling

• Recognition of an overload condition and reaction

Licensing and Ordering

IMPORTANT: It is required to have a valid Bosch CAN FD protocol license before selling a device

containing the Xilinx CAN FD IP core.

License Checkers

If the IP requires a license key, the key must be verified. The Vivado® design tools have

several license checkpoints for gating licensed IP through the flow. If the license check

succeeds, the IP can continue generation. Otherwise, generation halts with error. License

checkpoints are enforced by the following tools:

• Vivado synthesis

• Vivado implementation

• write_bitstream (Tcl command)

IMPORTANT: IP license level is ignored at checkpoints. The test confirms a valid license exists. It does

not check IP license level.

License Type

The core is provided under the terms of the CAN FD LogiCORE™ IP License Agreement for

Automotive or Non-Automotive applications. Click here for more information about

obtaining a CAN FD license.

For more information, visit the CAN FD product web page.

Information about other Xilinx LogiCORE IP modules is available at the Xilinx Intellectual

Property page. For information on pricing and availability of other Xilinx LogiCORE IP

modules and tools, contact your local Xilinx sales representative.

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Chapter 2

Product Specification

Standards

The CAN FD core conforms to the ISO-11898-1/2015 standard specification [Ref 1].

Performance

For full details about performance, visit the Performance and Resource Utilization web

page.

Resource Utilization

For full details about resource utilization, visit the Performance and Resource Utilization

web page.

Port Descriptions

The host interface of the CAN FD core is either the AXI4-Lite or the APB interface,

depending on the parameter selected in the Vivado™ IDE. Tab le 2 -1 defines the core

interface signaling.

Table 2-1: CAN FD Core I/O Signals

Signal Name Interface Type Default Description

AXI4-Lite Interface Signals

s_axi_*(1) S_AXI_LITE – – See the Vivado AXI Reference Guide (UG1037)

[Ref 7] for the description of the AXI4 signals.

Clock, Interrupt, and PHY Signals

ip2bus_intrevent Interrupt O 0x0 Active-High interrupt line.(2)(3)

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Chapter 2: Product Specification

The CAN FD core requires a 32 KB memory mapped space to be allocated in the system

memory. Division of this addressable space within the core is shown in Tab le 2 -2 .

Note: The AXI4-Lite write access register is updated by the 32-bit AXI Write Data (*_wdata) signal,

and is not impacted by the AXI Write Data Strobe (*_wstrb) signal. For write access, both the AXI

Write Address Valid (*_awvalid) and AXI Write Data Valid (*_wvalid) signals should be asserted

together.

can_clk Clock I–

CAN clock input. Oscillator frequency tolerance

according to the standard specification.

can_phy_tx PHY O 1 CAN bus transmit signal to PHY.

can_phy_rx PHY I – CAN bus receive signal from PHY.

can_clk_x2 Clock I - This is fully synchronous to the CAN clock and is

a multiple by 2 in frequency.

APB Interface Signals

apb_clk Clock I - APB clock.

apb_resetn Reset I - Active-Low synchronous reset.

apb_pwdata[31:0] APB I - Write data bus.

apb_paddr[14:0] I - Address bus.

apb_pwrite I - Read or Write signaling:

• 0 for Read Transaction.

• 1 for Write Transaction.

apb_psel I - Active-High select.

apb_penable I - Active-High enable.

apb_prdata[31:0] O 0x0 Read Data bus.

apb_pready O 0x0 Active-High ready signal.

apb_perror APB O 0x0 Active-High R/W error signal. Reserved for future

use.

Notes:

1. The core does not support the wstrb signal on the AXI4-Lite interface.

2. The interrupt line is level-sensitive. Interrupts are indicated by the transition of the interrupt line logic from 0 to 1.

3. The AXI4-Lite interface signals and ip2bus_intrevent are synchronous to the s_axi_aclk clock.

Table 2-1: CAN FD Core I/O Signals

Signal Name Interface Type Default Description

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Tabla de contenidos

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