Introduction

The point-to-point high-speed transmission of data from transmitter to receiver across a HT link relies on source synchronous clocking. The specification identifies three modes of clocking:

• Synchronous

• Pseudo-Synchronous

• Asynchronous

The 1.04 version of the specification states that: "Only the synchronous clocking mode is fully specified in this revision of this specification." The specification further states that the other modes will be completely specified in later versions of the specification. All HT compliant devices are required to support the synchronous clocking mode. This introduction defines all three modes, and later sections in this chapter detail each mode. As you may have guessed, the section on the synchronous mode contains considerably more detail than the other modes.