Texas Instruments AM18x evaluation module with Wi-Fi TMDXEVMWIFI1808L TMDXEVMWIFI1808L Datenbogen
Produktcode
TMDXEVMWIFI1808L
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
6.14.2.2 PCB Stackup Specifications
shows the stackup and feature sizes required for SATA.
Table 6-40. SATA PCB Stackup Specifications
PARAMETER
MIN
TYP
MAX
UNIT
PCB Routing/Plane Layers
4
6
Layers
Signal Routing Layers
2
3
Layers
Number of ground plane cuts allowed within SATA routing region
0
Layers
Number of layers between SATA routing region and reference ground plane
0
PCB Routing Feature Size
4
Mils
PCB Trace Width w
4
Mils
PCB BGA escape via pad size
18
Mils
PCB BGA escape via hole size
8
Mils
Device BGA pad size
(1)
(1)
Please refer to the Flip Chip Ball Grid Array Package Reference Guide (
) for device BGA pad size.
6.14.2.3 Routing Specifications
The SATA data signal traces are edge-coupled and must be routed to achieve exactly 100 Ohms
differential impedance. This is impacted by trace width, trace spacing, distance between planes, and
dielectric material. Verify with a proper PCB manufacturing tool that the trace geometry for both data
signal pairs results in exactly 100 ohms differential impedance traces.
differential impedance. This is impacted by trace width, trace spacing, distance between planes, and
dielectric material. Verify with a proper PCB manufacturing tool that the trace geometry for both data
signal pairs results in exactly 100 ohms differential impedance traces.
shows the routing
specifications for the data and REFCLK signals.
Table 6-41. SATA Routing Specifications
PARAMETER
MIN
TYP
MAX
UNIT
Device to SATA header trace length
7000
Mils
REFCLK trace length from oscillator to Device
(1)
2000
Mils
Number of stubs allowed on SATA traces
0
Stubs
TX/RX pair differential impedance
100
Ohms
Number of vias on each SATA trace
3
Vias
(2)
SATA differential pair to any other trace spacing
2*DS
(3)
(1)
The SATA_REFCLK(P/N) pins include an internal 100 Ohms differential termination
(2)
Vias must be used in pairs with their distance minimized.
(3)
DS is the differential spacing of the SATA traces.
6.14.2.4 Coupling Capacitors
AC coupling capacitors are required on the receive data pair as well as the REFCLK pair.
shows the requirements for these capacitors.
Table 6-42. SATA Bypass and Coupling Capacitors Requirements
PARAMETER
MIN
TYP
MAX
UNIT
SATA AC coupling capacitor value
0.3
10
12
nF
SATA AC coupling capacitor package size
0603
10 Mils
(1) (2)
(1)
LxW, 10 mil units, i.e., a 0402 is a 40x20 mil surface mount capacitor.
(2)
The physical size of the capacitor should be as small as possible.
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Peripheral Information and Electrical Specifications
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