SoC Bus Selector

Convert bus to control signals

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Libraries:
SoC Blockset / Hardware Logic Connectivity

Description

The SoC Bus Selector block converts a set of control signals from a bus. The block accepts a bus and outputs control signals.

You can configure this block to support multiple protocol interface types. Parameter and port configurations for this block vary based on your desired protocol interface type and mode of operation, as outlined in this table.

Protocol Interface Type	Mode of Operation	Parameter Configuration	Enabled Output Ports
Data stream	Read stream data	Set Control protocol to Data stream and Control type to Valid.	valid
			tlast
	Write stream data	Set Control protocol to Data stream and Control type to Ready.	ready
Pixel stream	Read video stream	Set Control protocol to Pixel stream and Control type to Valid.	hStart
			hEnd
			vStart
			vEnd
			valid
	Write video stream	Set Control protocol to Pixel stream and Control type to Ready.	ready
Random access read	Read data	Set Control protocol to Random access read and Control type to Valid.	rd_aready
			rd_dvalid
Random access write	Write data	Set Control protocol to Random access write and Control type to Ready.	wr_ready
			wr_bvalid
			wr_complete

Examples

Histogram Equalization Using Video Frame Buffer

Perform histogram equalization with HDMI input and output and using external memory for video frame buffering.

• Open Script

Ports

Input

ctrlBus — Input control bus

bus

Input control bus, specified as a bus.

The data type of the input control bus depends on the values of the Control protocol and Control type parameters.

Parameter Configuration	Input Data Type
Set Control protocol to Data stream and Control type to Valid.	StreamM2SBusObj
Set Control protocol to Data stream and Control type to Ready.	StreamS2MBusObj
Set Control protocol to Pixel stream and Control type to Valid.	pixelcontrol
Set Control protocol to Pixel stream and Control type to Ready.	StreamVideoS2MBusObj
Set Control protocol to Random access read and Control type to Valid.	ReadControlS2MBusObj
Set Control protocol to Random access write and Control type to Ready.	WriteControlS2MBusObj

Data Types: StreamM2SBusObj | StreamS2MBusObj | pixelcontrol | StreamVideoS2MBusObj | ReadControlS2MBusObj | WriteControlS2MBusObj

Output

valid — Valid control signal

boolean scalar

Valid control signal, returned as a scalar. You can use this port for data stream and pixel stream protocols only.

Dependencies

To enable this port, set the Control protocol parameter to either Data stream or Pixel stream and the Control type parameter to Valid.

Data Types: Boolean

tlast — Indication of end of data packet

boolean scalar

Indication of end of the data packet, returned as a Boolean scalar.

Dependencies

To enable this port, set the Control protocol parameter to Data stream and the Control type parameter to Valid.

Data Types: Boolean

ready — Ready control signal

boolean scalar

Ready control signal, returned as a Boolean scalar. This port is available for Data stream and Pixel stream control protocols.

Dependencies

To enable this port, set the Control protocol parameter to either Data stream or Pixel stream and the Control type parameter to Ready.

Data Types: Boolean

hStart — First pixel in horizontal line of frame

boolean scalar

First pixel in a horizontal line of a frame, returned as a Boolean scalar.

Dependencies

To enable this port, set the Control protocol parameter to Pixel stream and the Control type parameter to Valid.

Data Types: Boolean

hEnd — Last pixel in horizontal line of frame

boolean scalar

Last pixel in a horizontal line of a frame, returned as a Boolean scalar.

Dependencies

To enable this port, set the Control protocol parameter to Pixel stream and the Control type parameter to Valid.

Data Types: Boolean

vStart — First pixel in first (top) line of frame

boolean scalar

First pixel in the first (top) line of a frame, returned as a Boolean scalar.

Dependencies

To enable this port, set the Control protocol parameter to Pixel stream and the Control type parameter to Valid.

Data Types: Boolean

vEnd — Last pixel in last (bottom) line of frame

boolean scalar

Last pixel in the last (bottom) line of a frame, returned as a Boolean scalar.

Dependencies

To enable this port, set the Control protocol parameter to Pixel stream and the Control type parameter to Valid.

Data Types: Boolean

rd_aready — Accept read requests

boolean scalar

Accept read requests, returned as a scalar. It indicates when to accept read requests.

Dependencies

To enable this port, set the Control protocol parameter to Random access read.

Data Types: Boolean

rd_dvalid — Read request valid

boolean scalar

Read request valid, returned as a Boolean scalar. It is the control signal that indicates the data returned from the read request is valid.

Dependencies

To enable this port, set the Control protocol parameter to Random access read.

Data Types: Boolean

wr_ready — Write ready signal

boolean scalar

Write ready signal, returned as a Boolean scalar. It corresponds to the backpressure from the slave IP core or external memory. When this value is 1 (high), it indicates that data can be sent. When this value is 0 (low), it indicates that the hardware logic must stop sending data within one clock cycle.

Dependencies

To enable this port, set the Control protocol parameter to Random access write.

Data Types: Boolean

wr_bvalid — Write valid signal

boolean scalar

Write valid signal, returned as a Boolean scalar. It is the response signal from the slave IP core that you can use for diagnosis purposes. This value becomes 1 (high) after the AXI4 interconnect accepts each burst transaction.

Dependencies

To enable this port, set the Control protocol parameter to Random access write.

Data Types: Boolean

wr_complete — Write transaction complete

boolean scalar

Write transaction complete, specified as a Boolean scalar. It is the control signal that when remains high for one clock cycle indicates that the write transaction has completed. This signal asserts at the last wr_bvalid of the burst.

Dependencies

To enable this port, set the Control protocol parameter to Random access write.

Data Types: Boolean

Parameters

Control protocol — Protocol interface selection

Data stream (default) | Pixel stream | Random access read | Random access write

Specify the protocol interface as one of these values:

• Data stream — Use this protocol if you require AXI4 data stream.

• Pixel stream — Use this protocol if you require AXI4 video stream.

• Random access read — Use this protocol if you require AXI4 read.

• Random access write — Use this protocol if you require AXI4 write.

The output ports of the block vary based on the type of Control protocol and Control type that you select. For more details, see Description.

Control type — Control type selection

Valid (default) | Ready

Specify the type of control.

The output ports of the block vary based on the type of Control protocol and Control type that you select. For more details, see Description.

Extended Capabilities

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

To automatically generate HDL code for your design, and execute on an SoC device, use the SoC Builder tool. See Use SoC Builder to Generate SoC Design.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2019a