Sata - Nvidia Jetson TX2 Manual

5.3 SATA

A Gen 2 SATA controller is implemented on Jetson TX2/TX2i. The interface is brought to the module connector as show n in the
figure below .
Figure 18. SATA Connection Example
Jetson TX2/TX2i
Tegra
PEX, USB PEX_TX5P
PEX_TX5N
3.0 & SATA
PEX_RX5P
PEX_RX5N
PEXCTL
PEX_L2_CLKREQ_N
PMIC
SATA Design Guidelines
Table 26. SATA Signal Routing Requirements
Parameter
Specification
Max Frequency
Topology
Configuration / Device Organization
Max Load (per pin)
Termination
Impedance
Reference plane
Trace Impedance
Spacing
Trace Spacing
Pair-to-pair (inter-pair)
To plane & capacitor pad
To unre lated high-speed signals
Length/Skew
Breakout region
Max Trace Length/Delay
Max PCB Via distance from pin
Max Within Pair (Intra-Pair) Skew
Intra-pair matching between subsequent discontinuities
Differential pair uncoupled length
AC Cap
AC Cap Value
AC Cap Location (max distance from adjacent discontinuities)
Via
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
SATA_TX+
SATA_TX–
SATA_RX+
SATA_RX–
PEX1_CLKREQ#
Mux
SATA_DEV_SLP
SEL
GPIO7
Bit Rate / UI
Differential Pair / Single Ended
Stripline / Microstrip
Stripline / Microstrip
Stripline / Microstrip
Max Length
Spacing
typical (max)
0.01uF
D45
0.01uF
D46
0.01uF
G45
G46
VDD_1V8 VDD_3V3_SLP
C47
Level
Shifter
D47
VDD_5V0_IO_SLP
VDD_12V_SLP
Requirement Units
3.0 / 333.3 Gbps / ps
Point to point
1 load
0.5 pf
100 Ω
GND
95 / 45-55 Ω
3x / 4x Dielectric
3x / 4x
3x / 4x
41.9 ps
Min width/spacing
76.2 (480) Mm (ps)
6.29 (41.9) mm (ps)
0.15 (0.5) mm (ps)
0.15 (0.5) mm (ps)
6.29 (41.9) mm (ps)
uF
0.01 (0.012)
mm (ps)
8 (53.22)
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
1
2
3
4
0.01uF
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Notes
1.5GHz
Unidirectional, differential
On die termination
±15%
4x or wider dielectric height spacing is
preferred
Do trace length matching before hitting
discontinuities
The AC cap location should be located as
close as possible to nearby
discontinuities.
33