Carrier Board Design Guide for SOM-9X35 Module
31
4.1.2
HDMI Layout & Routing Recommendations
HDMI Signal
Differen�al Pair
S1
S
S
Reference Plane
W
W
Sig M
Sig P
Figure 38: HDMI differential trace width and spacing example
S
W
S
HDMI Signal
Single-ended
Reference Plane
Sig
Figure 39: HDMI single-ended trace width and spacing example
Metrics
General Information
Clock frequency
25MHz - 600MHz
Data rate
6.0 Gbit/s per lane
Impedance
Differential
Main route
100Ω ± 3%
Connector
100Ω ± 10%
Single-ended
Main route
50Ω ± 20%
Connector
50Ω ± 30%
Length match
Differential pair trace mismatch
<5mil
Pair to pair trace mismatch
<27mil
Spacing
Spacing to all other signals
4 x line width
Spacing data lane-to-lane
3 x line width
Table 08: HDMI layout guidelines
Net Name
Trace
Length
(mil)
Length
Spec (mil)
Length
Mismatch
(mil)
Length
Mismatch
Spec (mil)
Total
Delay
(Trace +
Via) (ps)
Delay
Mismatch
(ps)
Delay
Mismatch
Spec (ps)
Notes
TX_CH2_P
578.393
6000
-0.25
6.75
83.52
-0.04
1
Inter-pair
TX_CH2_M
578.641
83.56
TX_CH2_P
-8.53
29.74
-1.23
5
Pair-to-Pair
TX_CH2_M
-9.45
-1.36
TX_CH0_P
584.078
6000
-0.71
6.75
84.34
-0.10
1
Inter-pair
TX_CH0_M
584.786
84.44
TX_CH0_P
-2.85
29.74
-0.41
5
Pair-to-Pair
TX_CH0_M
-3.31
-0.48