Register Read

Read data from a register region on the specified IP core

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Libraries:
SoC Blockset / Processor I/O

Description

The Register Read block reads data from a register region on the specified IP core. In simulation, a timer-driven or event-driven task subsystem contains the Register Read block. The data signals from the Register Read block connect to the Register Channel block managing those registers and their transactions.

When developing or analyzing the software side of an SoC application, the Register Read block can be connected to an IO Data Source block. In this configuration, the IO Data Source block provides either previously recorded or artificial data, enabling a more directed simulation of the software and processor side of the application, without need to explicitly model the hardware and memory interactions.

Examples

Task Execution

Simulate task execution and how to generate code and run it on an SoC hardware board.

• Open Script

Streaming Data from Hardware to Software

A systematic approach to design the data-path between hardware logic (FPGA) and embedded processor using SoC Blockset™.

• Open Script

Packet-Based ADS-B Transceiver

Packet-based systems are common in wireless communications. Data is received over the air and is decoded as discrete packet data on a compute device. For given system requirements, it is difficult to design a system and implement directly on SoC as it often involves long iterations of debugging and integration on hardware since hardware effects are difficult to account for at design time. In this example, you will design packet-based airplane tracking application based on Automatic Dependent Surveillance Broadcast (ADS-B) standard, partitioned between FPGA and embedded processor. Unlike traditional methods, you will simulate the application design with memory interface before implementation on hardware using SoC Blockset™ to shorten development time. You will then validate the design on hardware by automatically generated code from the model.

• Open Script

Ports

Input

msg — Data message from register

scalar

This message port receives data messages from a connected Register Channel or IO Data Source block. The messages process when the Task Manager block triggers task containing the Register Read block. For more information on messages, see Messages.

Data Types: SoCData

Output

data — Output signal

vector

This port emits the data vector read from the specified registers in the Register Channel starting at Offset address from the base address of the IP core.

Data Types: single | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean

Parameters

Device name — Path and file name of IP core device

/dev/mwipcore (default) | character array

Enter the path and file name of the IP core device.

Offset address — Offset from the base address of the IP core to the register

hex2dec('0100') (default) | positive integer

Enter the offset from the base address of the IP core to the register. The block reads data from this register. Use the hex2dec function when you specify the offset address using a hexadecimal number expressed as a character vector. The offset address can be selected using the Memory Mapper tool.

Output data type — Data type used by IP core

uint32 (default) | single | int8 | uint8 | int16 | int32 | uint32 | boolean | fixed-point

Enter the data type used by the IP core.

Output vector size — Size of data vector from IP core

1 (default) | positive integer

Enter the size of the data vector read from the IP core device.

Sample time — Sample time

0.1 (default) | positive number

Enter the sample time in seconds. Either the connected Register Channel or IO Data Source blocks get polled at this rate when this block is used in a timer-driven task.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To automatically generate C code for your design, and execute on an SoC device, use the SoC Builder tool. To generate and execute C code for your SoC models, Embedded Coder^® features are required. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

SoC Builder implements the Register Read block with FPGA and processor IPs that use the AXI4 interface protocol. The AXI4 interface protocol allows the processor algorithm to read vector data from a contiguous group of registers on the FPGA. Use this block for simple, low-throughput memory-mapped communication, such as reading from control and status registers. This diagram shows a generalized representation of the generated code implementation.

Version History

Introduced in R2019a