A problem can occur when using the AXI-IP blocks in System Generator with the ARESETn pin. This problem is related to multi-rate designs that use the Synchronizer block to synchronize the periods of output ports. The reset from the synchronizer block is active high, but the reset for other AXI-IP cores are active low. This can cause the core to be held permanently in reset.
One manifestation of this problem is seen with AXI FIR Compiler v6.x blocks; the reset used to drive the synchronizer blocks derived directly from the ARESETn signal without being inverted. As a result, no output is obtained from the AXI-IP FIR block.
This problem is scheduled to be fixed in version 13.1 of System Generator.
To work around this issue, do not use the ARESETn reset signal while using version 12.3 or 12.4.