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AM3892 Datasheet(PDF) 270 Page - Texas Instruments |
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AM3892 Datasheet(HTML) 270 Page - Texas Instruments |
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270 / 299 page  AM3894 AM3892 SPRS681A – OCTOBER 2010 – REVISED MARCH 2011 www.ti.com 8.17.1.3 PCB Stackup Specifications Table 8-94 shows the PCB stackup and feature sizes required for SATA. Table 8-94. 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 Cuts Number of layers between SATA routing region and reference ground plane - - 0 Layers PCB trace width, w - 4 - Mils PCB BGA escape via pad size - 20 - Mils PCB BGA escape via hole size - 10 Mils MPU BGA pad size(1) 0.4 mm (1) NSMD pad, per IPC-7351A BGA pad size guideline. 8.17.1.4 Routing Specifications The SATA data signal traces must be routed to achieve 100 Ω (±20%) differential impedance and 60 Ω (±15%) single-ended impedance. The single-ended impedance is required because differential signals are extremely difficult to closely couple on PCBs and, therefore, single-ended impedance becomes important. 60 Ω is chosen for the single-ended impedance to minimize problems caused by too low an impedance. These impedances are impacted by trace width, trace spacing, distance to reference planes, and dielectric material. Verify with a PCB design tool that the trace geometry for both data signal pairs results in as close to 100 Ω differential impedance and 60 Ω single-ended impedance traces as possible. For best accuracy, work with your PCB fabricator to ensure this impedance is met. Table 8-95 shows the routing specifications for the SATA data signals. Table 8-95. SATA Routing Specifications PARAMETER MIN TYP MAX UNIT MPU-to-SATA header trace length 10(1) Inches Number of stubs allowed on SATA traces(2) 0 Stubs TX/RX pair differential impedance 80 100 120 Ω TX/RX single ended impedance 51 60 69 Ω Number of vias on each SATA trace 3 Vias(3) SATA differential pair to any other trace spacing 2*DS(4) (1) Beyond this, signal integrity may suffer. (2) In-line pads may be used for probing. (3) Vias must be used in pairs with their distance minimized. (4) DS = differential spacing of the SATA traces. 8.17.1.5 Coupling Capacitors AC coupling capacitors are required on the receive data pair. Table 8-96 shows the requirements for these capacitors. Table 8-96. SATA AC Coupling Capacitors Requirements PARAMETER MIN TYP MAX UNIT SATA AC coupling capacitor value 1 10 12 nF SATA AC coupling capacitor package size(1) 0402 0603 EIA(2) (1) 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. (2) EIA LxW units; i.e., a 0402 is a 40x20 mil surface-mount capacitor. 270 Peripheral Information and Timings Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): AM3894 AM3892 |
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