DRA722_17 Datasheet, PDF (369/408 Pages) Texas Instruments – Infotainment Applications Processor

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DRA722, DRA724, DRA725, DRA726
SPRS956B – MARCH 2016 – REVISED JANUARY 2017
Table 8-15. HDMI PCB Stackup Specifications (continued)
PARAMETER
MIN
TYP
MAX
Signal Routing Layers
2
3
-
Number of ground plane cuts allowed within HDMI routing
region
-
-
0
Number of layers between HDMI routing region and
reference ground plane
-
-
0
PCB Trace width
4
UNIT
Layers
Cuts
Layers
Mils
8.5.4.6 Grounding
Each TMDS channel has its own shield pin and they should be grounded to provide a return current path
for the TMDS signal.
8.5.5 SATA Board Design and Layout Guidelines
The device provides one SATA port. This section provides the timing specification for the SATA interface
as a PCB design and manufacturing specification. The design rules constrain PCB trace length, PCB trace
skew, signal integrity, cross-talk, and signal timing. TI has performed the simulation and system design
work to ensure the SATA interface requirements are met.
8.5.5.1 SATA Interface Schematic
Figure 8-36 shows the data portion of the SATA interface schematic.
DEVICE
SATA Interface
sata1_rxn0 ^C
sata1_rxp0 ^C
sata1_txn0l ^C
sata1_txp0 C
SATA
Connector
SPRS906_PCB_SATA_01
Figure 8-36. SATA Interface High Level Schematic
NOTE
AC coupling capacitors (C) are required on the receive and transmit data pairs. Table 8-16
shows the requirements for these capacitors.
Table 8-16. SATA AC Coupling Capacitors Requirements
PARAMETER
MIN
TYP
MAX
UNIT
SATA AC coupling capacitor value
SATA AC coupling capacitor package size
0.3
10
12
nF
0402
0603
EIA⁽¹⁾⁽²⁾
(1) EIA LxW units, i.e., a 0402 is a 40x20 mils surface mount capacitor.
(2) The physical size of the capacitor should be as small as practical. Use the same size on both lines in each pair placed side by side.
8.5.5.2 Compatible SATA Components and Modes
Table 8-17 shows the compatible SATA components and supported modes. Note that the only supported
configuration is an internal cable from the processor host to the SATA device.
Table 8-17. Compatible SATA Components and Modes
PARAMETER
Transfer Rates
MIN
MAX
UNIT
1.5
3
Gbps
SUPPORTED
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Applications, Implementation, and Layout 369
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