Systems and methods for maintaining an order of read and write transactions in a computing system

摘要

Systems and methods for maintaining an order of read and write transactions for each source through a bridge in a bus fabric. The bridge provides a connection from a first bus to a second bus within the bus fabric. The first bus has a single path for read and write transactions and the second bus has separate paths for read and write transactions. The bridge maintains a pair of counters for each source in a SoC to track the numbers of outstanding read and write transactions. The bridge prevents a read transaction from being forwarded to the second bus if the corresponding write counter is non-zero, and the bridge prevents a write transaction from being forwarded to the second bus if the corresponding read counter is non-zero.

主权项

1. A bridge circuit comprising control logic, wherein the control logic is configured to:
maintain a pair of counters for each agent of a plurality of agents, wherein each pair of counters comprises a write counter and a read counter, wherein the write counter tracks a number of outstanding write transactions for a respective agent, and wherein the read counter tracks a number of outstanding read transactions for the respective agent; forward a read transaction from a given agent out of the bridge circuit only if the write counter for the given agent is equal to zero; and forward a write transaction from the given agent out of the bridge circuit only if the read counter for the given agent is equal to zero.