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AM1808 Datasheet(PDF) 129 Page - Texas Instruments |
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AM1808 Datasheet(HTML) 129 Page - Texas Instruments |
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129 / 262 page  AM1808 www.ti.com SPRS653C – FEBRUARY 2010 – REVISED DECEMBER 2011 5.14.2.3 PCB Stackup Specifications Table 5-44 shows the stackup and feature sizes required for SATA. Table 5-44. 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 (SPRU811) for device BGA pad size. 5.14.2.4 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. Table 5-45 shows the routing specifications for the data and REFCLK signals . Table 5-45. SATA Routing Specifications PARAMETER MIN TYP MAX UNIT Device to SATA header trace length 7000 Mils REFCLK trace length from oscillator to Device 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 (1) SATA differential pair to any other trace spacing 2*DS (2) (1) Vias must be used in pairs with their distance minimized. (2) DS is the differential spacing of the SATA traces. 5.14.2.5 Coupling Capacitors AC coupling capacitors are required on the receive data pair as well as the REFCLK pair. Table 5-46 shows the requirements for these capacitors. Table 5-46. 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. Copyright © 2010–2011, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 129 Submit Documentation Feedback Product Folder Link(s): AM1808 |
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