19.9 Fixed Default Host

After the end of the current access, if no other request is pending, the client connects to its fixed default host. Unlike the last access host, the fixed default host does not change unless the user modifies it by software (FIXED_DEFMSTR field of the related MATRIX_SCFG).

This allows the MATRIX arbiters to remove the one latency clock cycle for the fixed default host of the client. All requests attempted by the fixed default host do not cause any arbitration latency, whereas other non-privileged hosts will get one latency cycle. This technique is used for a host that mainly performs single accesses or short bursts with Idle cycles in between.

This configuration provides no benefit on access latency or bandwidth when reaching maximum client bus throughput, regardless of the number of requesting hosts.