7.2.4. NREAD Transactions
The next set of transactions tested are NREADs. The DUT sends a group of NREAD transactions to the sister_rio module by cycling the read burst size from four to five in increments of 16 bytes. For each iteration, the ios_128_rd_wr_master_bfm read_write_cmd and read_data tasks are called. The task performs the read request packets across the I/O Avalon-MM Slave Read interface. The read transaction across the Avalon-MM interface is translated into a RapidIO NREAD request packets.
The NREAD request packets are received by the DUT and are translated into Avalon-MM read transactions that are presented across the sister_rio module‘s I/O master Avalon-MM interface. The sister_iom128_rd_wr_slave_bfm module checks the read operations and returns data by calling the sister_iom128_rd_wr_slave_bfm write_read_data task. This task drives the data and read datavalid control signals on the Avalon-MM master read port of the sister_rio module.
The returned data is expected at the DUT’s I/O Avalon-MM slave interface. The ios_128_rd_wr_master_bfm read_data task captures the read data. The read data and the expected value are then compared to ensure that they are equal.
Did you find the information on this page useful?