MAXI Offset - 2022.1 English

Vitis High-Level Synthesis User Guide (UG1399)

Document ID

UG1399

Release Date

2022-06-07

Version

2022.1 English

Fully Specified Offset: This rule adheres to the user-specified offset settings in the INTERFACE pragma.
No-offset Specified: If m_axi offset is not specified in the INTERFACE pragma, the global config option: config_interface -m_axi_offset <off/direct/slave> will impact the offset rules.
- Rule 1: User-specified SAXI Lite: When the INTERFACE pragma specifies an s_axilite interface associated with the m_axi interface, this rule explicitly groups all the m_axi offsets into an AXI4-Lite interface adapter, for which the -m_axi_offset=slave and the -default_slave_interface=s_axilite.
```
void top(int *a) {
#pragma HLS interface mode=m_axi port=a
#pragma HLS interface mode=s_axilite port=a
}
```
- Rule 2: No SAXI LITE: When the INTERFACE pragma does not associate an s_axilite interface with the m_axi interface, this rule explicitly groups all the m_axi offsets into the tool default offset: -m_axi_offset=slave
```
void top(int *a, int *b) {
#pragma HLS interface mode=m_axi port=a bundle=M0
#pragma HLS interface mode=m_axi port=b bundle=M0
}
```