MAXI - 2021.2 English

Vitis High-Level Synthesis User Guide (UG1399)

Document ID

UG1399

Release Date

2021-12-15

Version

2021.2 English

No Global bundle configuration: The default global config option

config_interface -m_axi_auto_max_ports
						false

automatically bundles all compatible m_axi interfaces into a single interface, and impacts the bundle rules as follows:

Rule 1: User-specified Bundle Name:

This rule explicitly groups all interface ports with the same bundle=<string> into a single m_axi interface port and names the RTL port the value specified by m_axi_<string>.

#pragma HLS INTERFACE m_axi port=a depth=50 bundle=newport
#pragma HLS INTERFACE m_axi port=b depth=50 bundle=newport
#pragma HLS INTERFACE m_axi port=c depth=50 bundle=newport
Log file 
INFO: [RTGEN 206-500] Setting interface mode on port 'example/newport' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/newport' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/newport' to 'm_axi'.

Any ports without the bundle specified are grouped into the default interface gmem0.

#pragma HLS INTERFACE m_axi port=a depth=50 bundle=newport
#pragma HLS INTERFACE m_axi port=b depth=50
#pragma HLS INTERFACE m_axi port=c depth=50
Log file 
INFO: [RTGEN 206-500] Setting interface mode on port 'example/newport' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/gmem0' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/gmem0' to 'm_axi'.

Rule 2: Default Bundle Name:

This rule explicitly groups all interface ports with no bundle name specified into a single m_axi interface port and names the port m_axi_gmem0.

#pragma HLS INTERFACE m_axi port=a depth=50 
#pragma HLS INTERFACE m_axi port=b depth=50
#pragma HLS INTERFACE m_axi port=c depth=50 
Log file 
INFO: [RTGEN 206-500] Setting interface mode on port 'example/gmem0' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/gmem0' to 'm_axi'.
INFO: [RTGEN 206-500] Setting interface mode on port 'example/gmem0' to 'm_axi'.

Global Bundle Configuration: The global config option config_interface -m_axi_auto_max_ports true explicitly maps all m_axi interface ports without a bundle name into individual interface ports and names the RTL port sequentially as m_axi_gmem0, m_axi_gmem1, m_axi_gmem2...