Specifications

76 Intel

Atom™ processor CE4100 Ref# 420826

Platform Design Guide

Intel Confidential

Table 6-2. HDMI Transmitter Routing Guidelines for the 1080 Stack-up

Parameter Routing Guidelines

Signal Group HDMI_TDMS_DP[0:2],

HDMI_TDMS_DN[0:2]

HDMI_TDMS_CLKP, HDMI_TDMS_CLKN

Reference Plane Solid Gnd Referenced,

Accompanying GND via is required for each signal net at layer transition,

though signal layer transition should be avoided.

Layer Assignment MicroStrip (top or bottom layer)

(top layer routing is preferred)

Trace Impedance (Z0) 100 Ω +/-10% (differential)

nominal Trace width 4.0 mils –microstrip (nominal 55 Ω, if it is single-end)

Nominal Trace Spacing Intra-pair Trace Spacing (fixed): 7 mils

Inter-pair spacing (minimum): 21 mils

To other signal space (minimum): 21 mils

nominal Trace Length Keep all lengths as short as possible.

TL1: 0.1 to 0.5 inches

TLT=TL1+TL2 --- 2 to 7 inches.

Length Matching requirements Length matching over TLT within a differential is within 50 mils or less.

Breakout 4 mils width with 14+ mils inter-pair spacing up to 0.5inch,

Minimize breakout length.

Breakout length is included in TLT.

Via Maximum 2 vias in each net, for routing partly on bottom layer. Ground vias

are required when signal net has layer transition.