XIO Controller IO Cell

XIO Cell

The XIO cell is the high-performance, low-latency controller interface to XDR™ DRAM memory devices. Using Octal Data Rate (ODR) signaling at speeds of up to 7.2Gbps, the XIO IO cell can support bandwidths of up to 28.8GB/s from a single XDR DRAM device. The XIO can be configured to support multiple XDR devices thus providing the necessary memory bandwidth for demanding graphics, computing and consumer electronics applications. It can be used in tandem with the XMC memory controller or integrated with the customer’s logical controller design.

The XIO macro cell is composed of one or two 12-bit request bus blocks (RQ), one control block (CTL), and a variable number of 8-bit or 9-bit (for ECC support) data blocks (DQs). The RQ block provides address and control information to the memory subsystem. The CTL block performs register access, initialization, maintenance and testability functions. Each DQ block is capable of transmitting and receiving data at up to 7.2Gbps data rates. FlexPhase™ circuits allow arbitrary per-pin DQ transmit and receive data phases eliminating the need for system trace length matching. The RQ block generates single-ended signals, while the DQ blocks transmit and receive ultra low-voltage Differential Rambus Signaling Level (DRSL) signals.

Bi-modal XIO

The bi-modal XIO 1/2 memory controller has been optimized to deliver high performance at superior power efficiency. Capable of supporting both XDR and XDR 2 DRAM, the bi-modal XIO1/2 memory controller is 3.5 times more power efficient than a GDDR5 memory controller. In XDR mode, the bi-modal XIO controller cell transmits at data rates of 3.2 to 7.2Gbps to XDR DRAM. When signaling in XDR 2 mode, the bi-modal XIO transmits at data rates of 8-10Gbps and beyond.

The bi-modal XIO1/2 controller is scalable across a broad range of data rates, while constantly maintaining its superior power efficiency. This ground-breaking combination of power efficiency and performance make the XDR and XDR 2 memory architectures a great solution for multi-core computing, graphics, gaming and consumer electronics.