DisplayPort知识.doc

Display Port 知识 Display Port连接器母座外形图 线材结构图 4.1.2 Type of Bulk Cable The bulk cable must be chosen to meet or exceed all of the electrical and mechanical requirements described below. A reference construction is depicted in Figure 4-2 below. The following is the description of the reference bulk cable construction. This description is for reference only. ? Overall shielded (braid) structure coated with jacket above ? Unit “A”: P1-P5 ‘STP’ or ‘Twinax’ # 30 AWG insulated stranded conductors, with # 30 AWG drain conductor ? Unit “B”: Unshielded, # 30 AWG single insulated stranded conductor. ? Unit “C”: Unshielded, # 28 or # 30AWG single insulated stranded conductor. Examples of differences: 1) Wire gauge selection is implementation specific provided the cable specifications of sections 4.1.5 and 4.1.6 are met. 2) A cable that is permanently attached to a DisplayPort device may have less than four Main Link　Lanes. 4.1.3 Impedance Profile The impedance specification must be defined in the time domain. The impedance profile must be measured using a controlled impedance fixture and TDR with a differential sampling head. The fixture rise time must be 50 ps (20% - 80%) or faster while the readout of measurement must be filtered to tr = 130 ps (20% - 80%). Impedance values must conform to those listed in Table 4-1. Figure 4-3 shows an example of measured data. Table 4-1: Impedance Profile Values for Cable Assembly Segment Differential Impedance Value Maximum Tolerance Comment Fixture 100 Ω Fixture shall have traces lengths of no more than 50 mm (2”) Connector 100 Ω Wire Management 100 Ω ± 10% Cable 100 Ω ± 5% Transition from ± 10% to ± 5% shall have a slop of 5 Ω / 80ps 4.1.5.4 Intra and Inter Pair Skew Both Intra-Pair and Inter-Pair skew are measured in the time domain with Differential TDR at the fixture rise / fall time, i.e. 50 ps measured (20% - 80%). 4.1.5.4.1 Intra-Pair Skew Intra-Pair skew must be no more than 50 ps and measured as depicted in Figure 4-8 below: 接线方法说明：