HyperTransport 2.0 Specification

The HyperTransport 2.0 specification, released in February 2004, introduced a 75 percent clock rate and bandwidth improvement over HyperTransport 1.x, as well as additional features and capabilities.

HyperTransport 1.x Features Plus:

• 1.0 GHz, 1.2 GHz, 1.4 GHz, 2.4 GHz Clock Rates
• 22..4 GB/s Max Aggregate Bandwidth (32-bit)
• 11.2 GB/s (89.6 Gb/s) Max Bandwidth per Unidirectional HT Link (32-bit)
• 2.8 GT/s (1.4 GHz x 2 DDR) per Bit
• PCI Express Mapping
• De-Emphasis
• Ensures proper signal integrity despite the dramatic clock rate increase
• 100% Backward Compatibility
• Runs in HT 1.x Mode when Higher Clock Rates Not Used
• Boot-Up Auto-Configuration
• HT Link Set to Highest HT Specification Revision Supported by all HT Link Devices

In addition, by preserving full backward compatibility with prior HyperTransport specifications, HyperTransport 3.0 continues to safeguard and maximize the industry’s legacy investments in the technology.