The MM-5490D is a 2GB PCI DRAM memory buffer with six RACEway ports and a 32bit/33MHz PCI port for use in multi-processing applications with intensive data streaming requirements. The card is capable of simultaneous burst mode access providing an aggregate bandwidth of up to 452MB/s.

The MM-5490D can be placed at the front or rear end of a real time DSP system to buffer incoming and outgoing data. Individual compute nodes can then receive, process and transfer streaming data at will, which can greatly reduce total compute time for the DSP’s and arbitration and overhead for the host, improving overall system performance. The card also provides the benefit of being a gateway from RACEway into the PCI bus.

In addition to having a 32-bit/33MHz PCI port, the card has two RACEway ports Over-The-Top and four RACEway ports on the face of the board. Each of these four ports has an individual memory bank with up to 512MB of DRAM. Each memory bank can be accessed simultaneously, but only through its dedicated RACEway port.

Seven nodes on three RACEway crossbars and a RACEway PXB are utilized to deliver simultaneous access from the two over the top RACEway ports and the PCI. The PCI is capable of being both a target (slave) and a DMA initiator (master), in order to maximize read and write throughput over the bus.

Reliability is ensured by burn-in and running memory diagnostics that check operations for 48 hours while temperature-cycling boards between 0° to +60° C.